The people behind
the calculators.

Choose the calculation that fits your question

Start with what you know: a total and a rate, two amounts to compare, or a part and its percentage. Each question needs a different formula.

Our tools separate those questions. Find a percentage of a number, measure a percentage change, find a missing whole, or express a part as a percentage of a total. Each free online calculator shows its formula alongside the result.

How the idea started

The Percentage Calculator grew out of work on VAT Calculator Worldwide. That project led to a broader set of tools for percentage questions beyond VAT, including shopping calculations, conversions and interest.

The website lets you try the four core calculation types in your browser. The mobile app keeps those free modes together and offers additional functions with Premium.

The people behind it

What you can expect

• Formulas beside the results

  Calculator pages include formulas and worked examples so you can check the method and understand which inputs belong where.

• Free and Premium access

  Four modes are free online and in the app. Premium unlocks the other app calculators and removes ads. The menu labels each calculator as Free or Premium.

• Financial assumptions

  Financial examples state their assumptions. A mortgage illustration, for example, distinguishes principal and interest from taxes, insurance and fees.

See the app’s Free and Premium comparison for all functions and access details.

Tell us what needs to be clearer

If you spot a calculation issue, an unclear explanation or a missing use case, email info@percentagecalculators.app. Include the page and a simple example of what you expected.

For details about data handling and use of the service, read our Privacy Policy and Terms of Use.