The Profit Margin Calculator computes both the dollar profit and the profit margin percentage, profit expressed as a percentage of revenue, from a revenue and a cost figure. Enter revenue and cost, and the calculator returns the profit amount and the margin percentage, the standard way profitability is measured and compared across products, periods or entire businesses.
Profit margin is one of the most widely used profitability metrics precisely because it normalizes profit against the scale of revenue: a $15,000 profit means something very different for a business with $50,000 in revenue than it does for one with $5,000,000 in revenue, and margin percentage captures that difference directly.
*These results are estimates for information only, not accounting or tax advice.*
Understand the profit margin formula
Dollar profit is simply Profit = Revenue - Cost. Profit margin then expresses that dollar profit as a percentage of revenue: Profit Margin % = (Revenue - Cost) / Revenue x 100, or equivalently Profit / Revenue x 100. Take revenue of $50,000 and cost of $35,000.
Subtracting gives a dollar profit of $15,000. Dividing that profit by the $50,000 revenue and multiplying by 100 gives a profit margin of exactly 30.00%, meaning 30 cents of every revenue dollar remains as profit after covering the $35,000 in costs.
See why margin is measured against revenue, not cost
Profit margin deliberately uses revenue, not cost, as its denominator, which distinguishes it from markup, a related but different measure that divides the same dollar profit by cost instead.
On the identical $50,000 revenue, $35,000 cost transaction, margin comes to 30.00% while markup on the same numbers would come to approximately 42.86% (the $15,000 profit divided by the $35,000 cost), a meaningfully different figure describing the same underlying transaction.
Margin answers "what percentage of each sales dollar is profit," which ties directly to how profitability is usually reported and compared at the revenue level, while markup answers a pricing-oriented question framed from the cost side instead.
Compare margins across products, periods or competitors
Because margin is expressed as a percentage rather than a raw dollar figure, it allows fair comparison across situations with very different scales.
A product line generating $500,000 in revenue at a 30% margin produces the same $150,000 in profit as a product line generating $1,000,000 in revenue at a 15% margin, even though the dollar revenue figures differ dramatically, and margin makes that comparison of relative profitability efficiency straightforward.
Tracking margin percentage over time for the same business, rather than only tracking dollar profit, often reveals whether profitability is genuinely improving on a per-dollar-of-revenue basis or whether dollar profit growth is simply following revenue growth without any real efficiency gain.
Understand what drives margin up or down
Margin rises when revenue grows faster than cost, or when cost is reduced while revenue holds steady, and it falls in the reverse situations: cost growing faster than revenue, or revenue declining while cost holds steady.
Because margin is a ratio, even a business with growing dollar profit can show a declining margin percentage if its costs are growing at a faster rate than its revenue, a warning sign that dollar profit figures alone would not necessarily surface as clearly.
The Profit Margin Calculator makes it quick to test how a change in either revenue or cost shifts the margin percentage, useful for scenario planning around price changes, cost increases, or sales volume shifts.
Know the limits of this calculation
This calculation uses a single cost figure and a single revenue figure without distinguishing between different types of margin that a more detailed income statement would separate out, such as gross margin (revenue minus cost of goods sold only) versus operating margin (which also subtracts operating expenses) versus net margin (which subtracts everything, including taxes and interest).
Which specific margin this calculation represents depends entirely on what is included in the cost figure entered.
Use the Profit Margin Calculator for a quick, direct margin calculation from any revenue and cost pairing, and be clear about which costs are included when comparing a computed margin against an industry benchmark that may define margin differently.
Frequently asked questions
What is the formula for profit margin?
The formula for profit margin is (Revenue - Cost) / Revenue x 100. This expresses dollar profit as a percentage of revenue, distinct from markup, which expresses the same dollar profit as a percentage of cost instead.
What is the profit margin on $50,000 revenue and $35,000 cost?
Revenue of $50,000 and cost of $35,000 produce a dollar profit of $15,000 and a profit margin of exactly 30.00%, since $15,000 divided by $50,000 equals 30%.
How is profit margin different from markup?
Profit margin divides profit by revenue, while markup divides the same profit by cost. On $50,000 revenue and $35,000 cost, margin is 30.00% while markup on the same figures is approximately 42.86%, even though both describe the identical transaction.
Why does margin allow fair comparison across different businesses?
Margin allows fair comparison because it expresses profit as a percentage of revenue rather than a raw dollar amount, so businesses of very different sizes can be compared on relative profitability efficiency rather than absolute dollar profit alone.
Can dollar profit grow while margin percentage falls?
Yes, if costs grow at a faster rate than revenue, dollar profit can still increase in absolute terms while the margin percentage declines, since margin measures the relationship between the two figures rather than either one in isolation.
Summary
The Profit Margin Calculator computes dollar profit (Revenue - Cost) and profit margin percentage (Profit / Revenue x 100) from revenue and cost figures. Revenue of $50,000 and cost of $35,000 produce a profit of $15,000 and a margin of exactly 30.00%.
Margin, measured against revenue, differs from markup, measured against cost, and tracking margin over time reveals profitability efficiency trends that dollar profit alone can obscure. Figures shown are estimates, not accounting advice.