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Free calculatorTax year 2026/27
Gross profit calculator
Calculate gross profit, gross margin and mark-up from sales and cost of sales.
The calculator
Estimate only. This calculator provides an estimate only and should not be relied on as advice.
How the gross profit calculator works
Enter your sales and cost of sales and the calculator works out your gross profit, gross margin (profit as a percentage of sales) and mark-up (profit as a percentage of cost). These are the headline numbers behind a healthy business — they show how much each sale contributes before overheads.
Tracking margin over time reveals pricing and cost problems early. Our management-accounts and consultancy services turn these figures into decisions.
Frequently asked
What is the difference between margin and mark-up?+
Margin is profit as a percentage of the selling price; mark-up is profit as a percentage of the cost. A 50% mark-up is a 33% margin — the calculator shows both.