Marks & Percentage Calculators

A collection of free marks and percentage calculators for students and teachers — work out what percentage one number is of another, find a percentage of a number, and calculate a percentage of a percentage. Every tool runs instantly in your browser.

Tools

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Pick any calculator below to get started.

Percentage Calculator

Work out any percentage of a number, or find what percentage one number is of another.

Percentage Change Calculator

Calculate the percentage change between two values, positive or negative, with the full formula.

Percentage Difference Calculator

Calculate the percentage difference between two numbers using their average as the base.

Percentage Decrease Calculator

Calculate the percentage decrease from an original value to a new, smaller value.

Percentage of a Number Calculator

Find what a given percentage of any number is, e.g. 15% of 200.

Percentage of a Percentage Calculator

Calculate a percentage of another percentage, e.g. 20% of 50%.

FAQ

Common Questions

Answers to frequent questions about this collection of tools.