How to Calculate Small Business Costs and Profit Margins

To calculate small business costs and profit margins correctly, first calculate the full cost of delivering the product, service, order, or job.

Then subtract the relevant costs from revenue and divide the resulting profit by revenue.

The arithmetic is simple. The difficult part is deciding which costs belong in each calculation. Get the cost number right before you calculate the percentage.

Our editorial recommendation is to build pricing from a defensible cost floor, separate owner labor from business profit, calculate gross and net margins separately, and then test the resulting price against what customers will actually pay.

A business can show busy calendars, rising sales, and a respectable gross margin while still producing weak net profit.

That usually happens because some costs never made it into the original cost model:

• non-billable labor and owner time
• shipping, refunds, and rework
• advertising
• equipment, software, and insurance

Last fact-checked: October 2, 2026

Written for US small-business owners who set prices or review profitability. Covers cost calculation, margins, pricing, and break-even.

Income tax, sales tax, and payroll rules can vary by state and locality, and accounting classifications can differ between businesses.

The calculation sequence at a glance

Each step below matches the numbered section with the same number.

Step	What to calculate	Why it matters
1	Complete cost list	Prevents hidden costs from disappearing from pricing
2	True cost from direct and allocated indirect costs	Shows which costs belong to a specific unit, order, or job
3	Overhead allocation	Converts shared business expenses into usable job or unit costs
4	Loaded labor cost	Replaces wage-only pricing with the cost of productive labor
5	Owner labor and business profit	Keeps pay for the owner’s work separate from the business return
6	Fixed and variable costs, contribution, and break-even	Makes scenario planning possible and shows how much sales volume is needed to cover fixed costs
7	Margin, markup, and target price	Prevents pricing errors caused by mixing different percentages
8	Gross, operating, and net profit	Separates product economics from whole-business profitability
9	Margin benchmark comparison	Checks whether a benchmark uses the same definitions as yours
10	Market check	Tests whether the business model can support the required price
11	Estimate versus actual review	Feeds real costs back into the next quote or price update
12	Recalculation triggers	Keeps prices current when costs, fees, or utilization change

Get the cost number right first

Get the cost number right before you calculate the percentage.

A profit-margin formula cannot repair an incomplete cost model.

If a product appears to cost $20 because that is what the supplier charges, but another $9 disappears into freight, packaging, payment fees, returns, and advertising, the margin calculation is wrong before the calculator opens.

A tidy percentage built on incomplete costs is just a precise mistake.

Instead of one universal category called “expenses,” build the cost model in layers so each number has a job.

Cost type	Meaning	Typical examples	Main use
Direct cost	Cost that can be traced to a specific product, order, service, or job	Materials, merchandise, direct labor, job-specific subcontractor	Unit and job profitability
Indirect cost	Cost needed to operate but not cleanly tied to one sale	Admin time, software, insurance, office expense	Overhead allocation
Fixed cost	Cost that does not change much with short-term sales volume	Base rent, core software, insurance	Break-even analysis
Variable cost	Cost that changes with units, orders, jobs, or revenue	Materials, card fees, shipping, sales commissions	Contribution margin
Semi-variable cost	Cost with both fixed and activity-driven elements	Utilities, phone plans, vehicle expense	Scenario planning
Owner compensation	Economic cost of the owner’s labor or management work	Salary equivalent, management pay, production labor	Separating labor from profit

These categories overlap. A cost can be direct and variable, or indirect and fixed.

Materials for one job are usually direct and variable. Office rent is usually indirect and fixed.

You do not need to force every expense into one box; classify it well enough to use the right calculation.

1. Build a complete cost list

Start with actual spending records rather than memory. Review these records:

• general ledger
• bank transactions
• card statements
• payroll reports
• supplier invoices
• platform statements
• operational logs that show returns, rework, travel, or downtime

Then build the list by business model. A generic “materials plus labor plus overhead” formula is too blunt for many businesses.

Business type	Costs that are easy to see	Costs owners often miss
Product or ecommerce	Product purchase or manufacturing, packaging	Inbound freight, outbound shipping, transaction fees, platform fees, discounts, refunds, returns, fulfillment, advertising, customer acquisition
Service business	Employee wages, subcontractors	Payroll burden, benefits, insurance, training, supervision, admin, travel, non-billable time, callbacks (return visits to fix completed work), software
Trade or field service	Materials, technician wages	Vehicle cost, windshield time (driving between jobs), equipment, consumables, warranty work, scheduling time, unbilled estimates
Custom or project work	Materials, quoted labor	Setup, design, revisions, waste, shop overhead, rework, project management, actual hours above estimate
Retail or wholesale	Inventory purchase	Freight, shrink (inventory lost to theft, damage, or errors), channel fees, returns, markdowns, payment fees, storage
Restaurant or food	Ingredients, hourly labor	Waste, spoilage, prep time, occupancy, utilities, cleaning, delivery commissions, operating overhead

Picture an ecommerce seller buying an item for $24 and selling it for $50.

The spreadsheet looks wonderful until the order also carries inbound freight and outbound shipping, a box, payment fees, a share of advertising spend, and an allowance for returns.

The supplier invoice was accurate, but it covered only part of the cost.

Use the true-cost checklist

For each product, service, job, or order, check these categories:

1. Record the direct materials, inventory, or subcontractor cost.
2. Add direct labor at its loaded cost, not just the wage.
3. Add inbound freight or acquisition cost when applicable.
4. Add packaging, fulfillment, delivery, or job travel.
5. Add transaction, platform, marketplace, or channel fees.
6. Add expected discounts, refunds, returns, callbacks, or warranty work.
7. Add advertising or customer-acquisition cost when it can be tied reasonably to the sale.
8. Allocate a fair share of overhead.
9. Include owner labor when the owner performs work that would otherwise require paid staff.
10. Compare the estimate with actual costs after the sale or job is complete.

Do not allocate every company expense to every sale just because the software allows it.

The allocation should reflect how the expense is actually consumed.

Keep unit economics and business-level economics separate

A useful cost model usually needs two views.

The first asks whether a specific unit, order, service, or job contributes enough money after the costs caused by that sale.

The second asks whether the entire business remains profitable after shared operating expenses are paid.

Mixing the two views creates bad decisions.

If every corporate or administrative expense is forced into one product using a weak allocation method, the product may look worse than it really is.

If shared expenses are ignored entirely, the same product may look much better than the business can afford.

For day-to-day pricing, track the costs that change with the sale plus a defensible share of shared resources.

For whole-business review, reconcile those unit results with the complete operating expense base.

The totals should explain each other over time even if every expense cannot be traced perfectly to one order.

This is especially important for businesses with several channels.

An online order, wholesale order, and retail-store sale can carry different payment fees, fulfillment costs, return rates, customer-acquisition costs, and overhead demands.

One blended margin can hide which channel is actually paying the bills.

2. Calculate the true cost per unit, order, or job

The basic cost model is:

True cost = direct costs + allocated indirect costs

Here is an illustrative product example.

Cost item	Illustrative amount
Product cost	$24.00
Inbound freight	$2.00
Packaging	$1.25
Outbound shipping subsidy	$4.00
Payment and platform fees	$2.25
Advertising allocation	$5.00
Returns allowance	$1.50
Allocated overhead	$3.00
True cost per order	$43.00

If the selling price is $50, the order produces $7 before any costs that were excluded from this model.

The apparent $26 spread between supplier cost and selling price was never profit.

Stress test: If advertising rises from $5 to $10 per order, true cost becomes $48.

At the same $50 selling price, the order contributes only $2 before any further business-level expenses.

A price that works only when every input behaves perfectly cannot absorb normal cost increases.

For project businesses, the same logic applies to a job rather than a unit.

Before quoting, record the estimated direct costs (material, labor, travel, equipment, and subcontractors) and the allocated overhead.

Then replace estimates with actuals after completion.

3. Allocate overhead without inventing a percentage

Overhead is the pool of indirect operating costs that the business must recover somehow. Typical items in the overhead pool include:

• rent
• administrative payroll
• accounting
• software
• insurance
• base vehicle expense
• office expense
• general management time

The common mistake is to pick an overhead percentage because it looks reasonable.

A better method starts with the actual overhead pool and divides it by a driver that matches how the business works.

Overhead rate = overhead pool / activity base

Illustrative service-business example:

Input	Illustrative amount
Monthly overhead pool	$12,000
Productive billable hours available	600 hours
Overhead per productive hour	$20 per hour

A two-hour job would receive $40 of overhead before profit is added, assuming productive labor hours are a reasonable driver for this business.

Stress test: If productive hours fall from 600 to 450 while overhead stays at $12,000, overhead per productive hour rises from $20 to about $26.67.

That change can destroy the economics of quotes built on an optimistic utilization assumption (the share of paid hours that turn into billable work).

Choose the allocation driver that fits the cost

Business pattern	Possible allocation driver	When it makes sense	Main warning
Labor-heavy service	Productive labor hours	Overhead largely supports staff time	Do not divide by paid hours if many hours are non-billable
High-volume product	Units or orders	Products consume similar shared resources	Poor fit when products vary greatly in complexity
Project business	Direct labor hours or job days	Job duration drives management and facility use	Track actual hours, not only quoted hours
Retail	Revenue, units, or floor space	Useful for broad store-level analysis	Revenue percentages can hide low-volume expensive items
Manufacturing	Machine hours, labor hours, or production runs	Equipment or production time drives overhead	One plant-wide rate can distort different processes
Mixed business	Multiple cost pools and drivers	Different overhead behaves differently	More precision adds maintenance work, so stop when detail stops changing decisions

If one driver produces absurd results, change the driver instead of defending the spreadsheet.

A small business needs a model it can maintain, but simplicity is useful only while it remains economically honest.

4. Calculate the real cost of labor

An employee’s wage is not the same as the cost of one productive hour.

Depending on location and employment structure, employers may also incur these costs:

• payroll taxes
• benefits
• insurance
• training
• paid leave
• supervision
• equipment
• non-billable time

For pricing, separate total employment cost from the hours that actually produce billable work.

Loaded productive-hour cost = total labor-related cost / productive hours

Illustrative example:

Labor input	Illustrative amount
Wage	$25.00 per paid hour
Employer costs and benefits	$7.00 per paid hour
Total paid-hour cost	$32.00 per hour
Paid hours per week	40 hours
Productive billable hours	28 hours
Weekly labor cost	$1,280
Cost per productive hour	$45.71

The customer billing rate must recover more than $25 because the business pays for 40 hours while only 28 hours produce billable work in this example.

Stress test: If productive time falls to 24 hours, the cost per productive hour rises to about $53.33 before overhead and profit.

Utilization therefore directly changes the cost of every billable hour.

Imagine a technician paid for a full day who spends an hour driving, 45 minutes buying a missing part, 30 minutes writing notes, and another hour on an unpaid callback.

Pricing only the wrench-in-hand time turns those real hours into invisible costs.

5. Separate owner labor from business profit

Owner compensation and profit answer different questions. Owner labor pays for work.

Profit is the return left after the business has paid for the resources required to operate, including a reasonable treatment of owner work.

This distinction matters most in owner-operated businesses.

Suppose an owner works 50 hours a week doing production, sales, scheduling, and customer service.

If the business reports $8,000 left at month-end but assigns no cost to the owner’s labor, the number cannot be compared cleanly with a business that pays a manager and production staff before calculating profit.

Use one consistent policy.

Either include owner labor in job or operating costs using a reasonable replacement-cost approach, or clearly state that the reported profit is before owner compensation.

Do not switch treatments when comparing months, products, or peer benchmarks.

For tax purposes, how owner pay is handled depends on the business’s legal structure, so confirm the treatment with an accountant before you set it.

A practical internal report can show both:

Measure	What it tells you
Profit before owner compensation	Cash-generating capacity before paying for owner work
Owner compensation	Value assigned to the owner’s operating labor or management role
Profit after owner compensation	Business return after paying for the work required to run it

This is also why two owners can both say “20% margin” and mean very different things.

6. Calculate contribution margin and break-even

Break-even is where contribution from sales covers fixed costs.

Revenue itself does not pay fixed costs because variable costs consume part of each sale first.

Contribution per unit = selling price - variable cost per unit

Illustrative example:

Input	Illustrative amount
Selling price	$80
Variable cost per unit	$48
Contribution per unit	$32

Each unit contributes $32 toward fixed costs and, after fixed costs are covered, toward profit.

The unit break-even formula is:

Break-even units = fixed costs / contribution per unit

Illustrative example:

Input	Illustrative amount
Monthly fixed costs	$16,000
Contribution per unit	$32
Break-even volume	500 units

At 500 units, contribution totals $16,000 and covers the fixed-cost pool in this simplified example.

Stress test: If variable cost rises to $56 while price stays at $80, contribution falls from $32 to $24 per unit.

Break-even then rises from 500 units to about 667 units, so the business must make about 167 more sales just to stand still.

For businesses with many products, use a weighted average only when the sales mix is reasonably stable.

Otherwise, calculate contribution by product, service, or job type and model the expected mix.

7. Understand markup and margin before setting a price

Markup and profit margin use different denominators. That is why the same percentage does not produce the same price.

Measure	Formula	Illustrative example
Markup	(price - cost) / cost x 100	Cost $60, price $100: markup is 66.7%
Margin	(price - cost) / price x 100	Cost $60, price $100: margin is 40%

The difference matters in practice. If someone says “add 40%” to a $60 cost, the price becomes $84.

That is a 40% markup but only a 28.6% margin. If the business needed a 40% margin, $84 is too low.

To calculate a selling price from a target margin:

Selling price = cost / (1 - target margin)

Illustrative example:

Input	Illustrative amount
True cost	$60
Target margin	40%
Required selling price	$100

The $40 profit is 40% of the $100 selling price.

Stress test: If true cost rises to $70 and the target margin remains 40%, the required price becomes about $116.67.

Keeping the old $100 price would reduce the margin to 30%.

Markup and margin are cousins, not twins.

Put the exact term in every pricing sheet, quote template, and management report so nobody has to guess which denominator was used.

8. Calculate gross, operating, and net profit margins separately

“Profit margin” is not one number. Gross margin looks at direct product or service economics.

Operating margin includes operating expenses. Net margin is the bottom line after all expenses included in the accounting period.

Use the same revenue period for both the profit figure and the denominator.

Measure	Formula	Illustrative example on $100,000 revenue
Gross profit margin	(revenue - direct cost) / revenue x 100	Direct cost $60,000: gross margin is 40%
Operating margin	operating profit / revenue x 100	Operating profit $12,000: operating margin is 12%
Net profit margin	net profit / revenue x 100	Net profit $8,000: net margin is 8%

Stress test: If direct costs stay at $60,000 but operating expenses rise by $6,000, gross margin remains 40% while operating and net margins fall.

That is why a healthy product margin does not guarantee a healthy business.

A restaurant can see a menu item with an attractive ingredient margin and still struggle after labor, waste, occupancy, utilities, and operating expenses arrive.

An ecommerce seller can see strong gross margin before advertising and returns.

A consulting firm can see strong project margin before sales time, admin, software, and owner management are counted.

Use gross margin to judge the economics of what you sell. Use operating margin to judge the economics of running the operation.

Use net margin to judge what remains after the full expense structure represented in the financial statements.

9. What is a good profit margin for a small business?

There is no useful universal percentage for every small business. A good margin depends on the business model, industry, scale, and capital intensity.

It also depends on risk, the treatment of owner compensation, and whether the number is gross, operating, or net margin.

A low-overhead professional service and a grocery retailer can both be healthy businesses with very different gross and net margins.

A capital-heavy manufacturer cannot be compared casually with a solo consultant.

Even two companies in the same industry may use different accounting classifications.

Instead of starting with a generic benchmark, ask four questions:

1. Is the margin definition the same as yours?
2. Does the benchmark include owner compensation in the same way?
3. Is the business model and sales channel comparable?
4. Does the margin generate enough absolute profit and cash for the business to survive, reinvest, and absorb normal volatility?

Use benchmarks as a reason to investigate, not as a substitute for your own cost model.

10. Compare the cost floor with the market price

Cost-based pricing and market-based pricing work together. Costs tell you the minimum economics the business requires.

The market tells you whether customers are willing to support those economics.

Competitor prices are clues, not your cost sheet.

Use a two-sided test:

Question	If the answer is yes	If the answer is no
Does the price cover true cost and required profit?	Continue to market test	Fix cost, scope, productivity, or price
Will customers pay the required price for the value offered?	The model may be viable	Change the offer, target customer, channel, cost structure, or business model

If your full-cost price is far above the market, do not immediately delete overhead from the spreadsheet to make the problem disappear.

The uncomfortable conclusion may be that the process is inefficient, the product is wrong for the channel, the target customer is wrong, or the business cannot earn the desired return at current costs.

Imagine a custom cabinet shop quoting an eight-hour job because the cutting and assembly look like eight hours.

The job later consumes 13 hours after setup, client changes, finishing, cleanup, and rework.

Matching a competitor’s lower quote does not make the missing five hours free.

The same rule works in reverse.

If customers willingly pay well above the cost-based minimum, there is no requirement to price down to a formula simply because cost-plus arithmetic produced a lower number.

11. Compare estimates with actual results

A cost model becomes useful only when actual results feed the next decision.

Otherwise, the spreadsheet preserves old assumptions with excellent formatting.

For every material product, service line, or project type, compare expected and actual economics, because healthy revenue can hide jobs that lose much of their expected profit.

In this illustrative job, labor, travel, and setup hours are costed at the $45.71 loaded hourly rate from Section 4.

Item	Estimated	Actual	What to investigate
Materials	$1,200	$1,320	Waste, price change, scope
Productive labor	20 hours	27 hours	Estimate quality, training, rework
Travel and setup	2 hours	4 hours	Route, access, scheduling
Labor, travel, and setup cost	$1,006	$1,417	Hours above estimate
Subcontractor	$400	$400	No variance
Allocated overhead	$600	$750	Lower utilization or longer duration
Selling price	$4,500	$4,500	Fixed quote
Job profit	$1,294	$613	Margin leak across several inputs

A single bad job may be noise, but repeated variance points to a pricing or operating problem.

If quoted hours are consistently below actual hours, fix the estimating method.

If returns cluster around one product, raise the returns allowance or solve the product problem.

If customer acquisition cost rises, update order economics before the old margin disappears.

The scene is familiar: the calendar is full, invoices go out, and the bank balance refuses to act impressed.

Adding revenue at the same broken unit economics does not fix the problem; correcting the costs and prices does.

12. Know when to recalculate costs and margins

There is no single calendar frequency for every business.

Recalculate whenever a material input changes enough to affect price, contribution, or profit.

Use these triggers:

• supplier or material prices change materially
• wages, payroll burden, or benefits change
• rent, insurance, software, vehicle, or other overhead changes
• shipping or fulfillment rates change
• payment or marketplace fees change
• advertising or customer-acquisition cost changes
• return, refund, warranty, or rework rates change
• productive utilization changes
• product mix or sales channel changes
• actual job hours repeatedly differ from estimates

A monthly review works well for volatile businesses.

A quarterly review can be enough for a stable cost structure, provided large changes trigger an immediate update.

Annual-only reviews are risky when major inputs move during the year.

Do not overwrite historical assumptions without keeping the old version.

You want to know whether margins changed because price changed, cost changed, mix changed, or the allocation method changed.

13. Common profit-margin mistakes

Using revenue as if it were profit

Revenue measures sales. Profit is what remains after the costs included in the chosen profit definition.

High sales can coexist with weak or negative profit. See Section 8.

Treating supplier cost as total product cost

Landed product cost may include freight, packaging, duties where applicable, handling, and other acquisition costs.

Order-level economics may also need fees, shipping, advertising, returns, and fulfillment. See Sections 1 and 2.

Pricing labor from wages alone

The business pays for more than productive customer-facing time. Use total labor-related cost and realistic productive hours. See Section 4.

Applying one arbitrary overhead percentage to everything

A single percentage can distort jobs or products that consume shared resources very differently.

Start with the actual overhead pool and a defensible driver. See Section 3.

Calling owner labor “profit”

If the owner performs work that would require paid labor in another business, ignoring that work makes comparisons misleading. See Section 5.

Confusing markup with margin

A 40% markup does not equal a 40% margin. Label every percentage by name. See Section 7.

Looking only at gross margin

Gross margin can stay healthy while operating and net profit deteriorate. Review more than one layer. See Section 8.

Copying competitor prices without knowing competitor economics

A competitor may have lower costs, different suppliers, another sales channel, a different owner-pay policy, or simply bad pricing.

Their number is not proof of your viable price. See Section 10.

Using quoted hours instead of actual hours forever

Treat estimates as assumptions until completed jobs confirm them.

Feed actual hours, material usage, rework, and travel back into the next quote. See Section 11.

Calculating break-even from sales revenue alone

Fixed costs are covered by contribution after variable costs, not by the entire sale price. See Section 6.

14. A practical small-business costing worksheet

Run this process for each important product, service, job type, or sales channel.

1. Choose the unit you are measuring: one item, one order, one billable hour, one service visit, or one project.
2. Record the selling price and expected sales volume.
3. List every direct cost tied to that unit.
4. Separate variable costs from fixed or indirect costs.
5. Build the monthly or annual overhead pool from actual business expenses.
6. Choose an overhead driver that matches resource use.
7. Allocate overhead to the unit or job.
8. Calculate loaded labor using realistic productive hours.
9. Add a reasonable treatment of owner labor when the owner performs operational work.
10. Calculate contribution margin and break-even.
11. Convert the desired margin into a target selling price when pricing is flexible.
12. Calculate gross profit and gross margin.
13. Calculate operating and net margins for the whole business period.
14. Compare the target price with customer willingness to pay and competitive alternatives.
15. Record actual cost and time after the sale or job.
16. Update the next price or quote when actual results show a repeatable variance.

Skip the 47-tab accounting model; build one simple enough to update and complete enough to include every cost the business actually pays.

15. Example: from revenue to gross, operating, and net margin

Consider a small service company with the following illustrative monthly numbers.

Item	Illustrative amount
Revenue	$80,000
Direct materials and subcontractors	$18,000
Loaded productive labor	$26,000
Gross profit	$36,000
Operating overhead	$27,000
Operating profit	$9,000
Other expenses included before net profit	$2,000
Net profit	$7,000

Gross margin is 45% because $36,000 gross profit divided by $80,000 revenue equals 45%.

Operating margin is 11.25% because $9,000 operating profit divided by $80,000 revenue equals 11.25%.

Net margin is 8.75% because $7,000 net profit divided by $80,000 revenue equals 8.75%.

Now suppose the owner had originally looked only at direct materials and called the remaining $62,000 “margin.”

That would have hidden loaded labor, overhead, and other expenses. Those costs existed all along; the earlier calculation simply left them out.

Stress test: If revenue falls 15% to $68,000 while fixed overhead remains roughly unchanged, profitability can fall much faster than revenue.

If the lost sales also reduce variable direct costs, the exact result depends on the cost mix.

That is why fixed and variable classification matters before scenario planning.

Frequently asked questions

How do you calculate profit margin for a small business?

Subtract the relevant costs from revenue to get the chosen profit figure, then divide that profit by revenue and multiply by 100.

Specify whether you mean gross, operating, or net margin; see Section 8.

What costs should a small business include?

Include every cost required to acquire or produce, sell, deliver, support, and administer the product or service at the level being measured.

Keep the treatment of direct, indirect, fixed, variable, and owner-compensation costs clear; see Sections 1 and 5.

What is the difference between markup and margin?

Markup divides profit by cost, while margin divides profit by selling price.

A 40% markup on a $60 cost gives an $84 price but only a 28.6% margin; see Section 7.

How do I calculate overhead for pricing?

Start with the actual overhead pool, then divide it by a sensible activity base such as productive hours, units, jobs, machine hours, or another driver.

Avoid picking a percentage with no connection to actual expenses; see Section 3.

How do I set an hourly rate for a service business?

Add loaded labor cost and overhead per productive hour, then divide the total by one minus the target margin.

With the illustrative figures from Sections 3, 4, and 7, $45.71 of labor plus $20 of overhead is $65.71 per productive hour, so a 40% target margin requires a rate of about $109.52.

What is a good profit margin for a small business?

There is no single useful percentage for all small businesses.

Compare the same margin type, business model, owner-compensation treatment, and industry context before using a benchmark; see Section 9.

Should I price from cost or from the market?

Use both. Cost establishes the economic floor, while the market tests whether customers will pay a price that supports the business; see Section 10.

How do I calculate break-even sales?

Calculate contribution after variable costs, then divide fixed costs by contribution per unit for unit break-even.

For multi-product businesses, account for the expected sales mix; see Section 6.

How often should I update costs and margins?

Update them whenever a material input changes and review them on a regular schedule.

Volatile businesses may need monthly review, while stable businesses can often review quarterly with immediate updates for major changes; see Section 12.

Final rules to keep

The useful number is not the prettiest percentage on the dashboard.

It is the one built from costs the business actually pays. Keep three rules beside every price and margin report:

1. Get the cost number right before you calculate the percentage.
2. Label every margin as gross, operating, or net before you report it.
3. Trust a price only when both the cost model and the market can support it.

Sources and references

Accounting, profitability, and break-even

• U.S. Small Business Administration: Break-even point
• Xero: How to measure business profitability
• QuickBooks: Profit formula and profit margin
• Shopify: What is profit margin?
• Omni Calculator: Margin calculator

Pricing, markup, and overhead

• Shopify: Markup vs. margin
• Square: Business overhead costs
• UK Business Forums: Mark-up and profit margin
• UK Business Forums: How do you price a new product or service?
• UK Business Forums: Product margins
• UK Business Forums: Calculating turnover and break-even