Margin Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

Share Print Save

If you are comparing alternatives, the fastest way to stay grounded is to make the assumptions explicit. Margin Calculator calculates a margin or markup relationship from the cost, selling price, or target rate shown on the form and lets you change those inputs one at a time.

What this calculator does

Margin Calculator calculates a margin or markup relationship from the cost, selling price, or target rate shown on the form. The visible form contains Selling price / revenue, Cost. These are the inputs that define this calculator’s scope. If a value, rule, or adjustment is not represented by a working field, it should not be assumed to be included in the result.

How to use it

Enter Selling price / revenue and Cost. Keep monetary inputs in the same currency, or use the currency selector when one is provided. Before calculating, recheck Selling price / revenue and the other values that materially affect the result. For a clean comparison, hold the other inputs constant while changing one assumption at a time so you can see what is driving the result.

How the calculation works

Gross margin = (revenue − cost) ÷ revenue. Markup = (revenue − cost) ÷ cost. When a target margin is used to solve price, selling price = cost ÷ (1 − target margin). This is the calculation method that should anchor any manual check of the output. If a displayed field does not affect the current calculation, that limitation is stated below rather than silently treating the field as part of the formula.

Example

With the displayed example values (Selling price / revenue = 100 and Cost = 60) and the remaining defaults unchanged, the current calculator returns 40% for gross margin. Replacing those defaults with your own values recalculates the same relationship; change one input at a time if you want to see which assumption is driving the difference.

How to interpret the result

Margin and markup describe the same profit dollars against different denominators, so their percentages are not interchangeable. Compare the reported rate with the denominator the calculator actually uses. Compare results produced from the same definitions and time period. A mathematically larger or smaller number is not automatically better unless the financial context makes that direction meaningful.

Limitations and notes

The model treats the entered cost as the relevant cost base. Overhead allocation, taxes, payment fees, returns, shipping, discounts, and changing unit costs can alter realized profitability. Where the calculator depends on estimates, rates, accounting classifications, or future behavior, test more than one plausible scenario before making a decision.