What is a Profit Margin Calculator?
A Profit Margin Calculator works out profit, profit margin and markup from the cost price and the selling price.
Margin is profit as a share of the selling price; markup is profit as a share of cost. The two are often confused, which can lead to underpricing.
How to use the Profit Margin Calculator
- Enter cost price.
- Enter selling price.
- Tap Calculate to see the result.
- Tap Reset to clear the fields and try again.
Who should use it
- Shop owners and resellers
- Freelancers pricing services
- Students learning business maths
Key terms
- Profit margin
- Profit divided by selling price.
- Markup
- Profit divided by cost price.
Frequently asked questions
What is the difference between margin and markup?
Margin uses the selling price as the base; markup uses cost.
Should I include GST?
Use prices without GST for an accurate margin.
Can margin be negative?
Yes, when you sell below cost.
Is my data stored?
No.
Is my data stored?
No. Everything you enter stays in your browser and is cleared when you close the page.
Last updated: 1 November 2026