Profit Margin Calculator

Margin, markup, and selling price — trade arithmetic, no interest involved

Margin and markup are two genuinely different ways of expressing the same underlying profit, calculated from different denominators — margin as a percentage of selling price, markup as a percentage of cost — and confusing the two produces a pricing calculation that's off by a meaningful amount, not a rounding error.

Why margin and markup give different percentages for the identical profit

Margin is profit expressed as a percentage of selling price (profit ÷ selling price). Markup is the same absolute profit expressed instead as a percentage of cost (profit ÷ cost) — since selling price is always higher than cost (assuming a profitable sale), and margin divides by the larger number while markup divides by the smaller one, markup is always a numerically larger percentage than margin for the identical transaction and identical absolute profit. This distinction matters directly for pricing: setting a price using a markup percentage applied to cost produces a different result than setting a price using an equivalent-sounding margin percentage applied to a target selling price — the two aren't interchangeable despite both being commonly described loosely as "profit percentage."

A worked example

An item with a specific cost and selling price has a margin percentage (profit as a share of the selling price) that's numerically smaller than its markup percentage (the identical profit as a share of the lower cost figure) — the same absolute profit produces two different percentage figures purely because of which number (selling price versus cost) is used as the denominator.

How this connects to your other business calculations

Margin and markup calculations connect directly to the Break-Even Calculator, which uses contribution margin (a related concept) to determine required sales volume — understanding the margin-versus-markup distinction here directly clarifies how contribution margin is calculated and interpreted in that related business calculation.

Common mistakes

Using a markup percentage where a margin percentage was actually intended (or vice versa) when setting a price is a common and consequential business pricing mistake — since markup and margin percentages differ numerically for the identical profit, applying the wrong one systematically produces a final price that doesn't achieve the profit percentage that was actually intended.