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Profit margin

How to calculate profit margin percentage

The share of every revenue dollar you keep after defined costs come off.

Profit margin is the share of every revenue dollar that survives once a defined set of costs has been subtracted. It is the single most-quoted health metric in small business reporting because it normalises performance across companies of wildly different sizes: a 10% margin means the same thing to a coffee cart and a global retailer. The formula is short, but the inputs — what counts as "cost", which revenue line you start from — are the part that actually deserves attention.

This page walks the standard formula with concrete numbers, then expands the discussion to the three margin layers (gross, operating, net) that almost every finance team reports.

The profit margin formula

Margin compares profit to revenue. With profit of $18,000 on revenue of $60,000:

margin% = (profit ÷ revenue) × 100% = ($18,000 ÷ $60,000) × 100% = 30%

That is the share of every revenue dollar you keep before — or after — operating costs, depending on whether you are calculating gross or net margin.

Gross, operating and net margin — three layers from the same formula

Almost every income statement reports three margins. Each uses the same formula, but a wider set of costs comes off revenue at each step:

  • Gross margin = (revenue − cost of goods sold) ÷ revenue. Tracks the unit-level profitability of the product.
  • Operating margin = (revenue − COGS − operating expenses) ÷ revenue. Adds wages, rent, marketing and other running costs.
  • Net margin = (revenue − all costs including tax and interest) ÷ revenue. The bottom-line number.

Comparing companies fairly requires you to compare the same margin layer. Mixing gross and net is the fastest way to draw the wrong conclusion.

Common mistakes to avoid

  • Calling margin "markup" or vice versa. Margin divides by revenue; markup divides by cost.
  • Comparing APR and APY directly without normalising for compounding frequency.
  • Booking commission on invoiced sales but forgetting the clawback when revenue is refunded.
  • Averaging percent growth across periods rather than recomputing from the underlying values.

Calculation tips & best practices

  • Define numerator and denominator explicitly before reporting any business percent.
  • Document the date range; a percent comparison without a date window is decoration, not data.
  • Treat published rates as a starting point; fees, taxes and timing change the realised number.
  • Always confirm material financial figures with a qualified adviser.

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Calculate profit margin instantly

Open the calculator in Basic mode, divide profit by revenue, and multiply by 100. The breakdown shows the decimal-to-percent conversion in plain steps.

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