Percentage Calculator

About the Percentage Calculator

Percentages come in several shapes and most calculators only handle one. This tool answers four questions at once: what a percentage of a number is, what percentage one number is of another, the percentage change between two values, and the original value before a percentage was applied.

Each mode shows the formula it used, so you can check the reasoning as well as the answer. That matters when the number ends up in an invoice, a report or a piece of homework.

How to use the Percentage Calculator

1. 1Pick the question you are trying to answer using the mode tabs.
2. 2Enter your two values.
3. 3Read the answer, which updates as you type.
4. 4Check the working shown underneath to confirm the formula.

Features

• Four modes covering the standard percentage problems
• Formula and substituted working displayed with each result
• Decimal input supported throughout
• Sensible rounding with the full value available
• Clear handling of division by zero

Why people use it

• Avoid the classic mistake of confusing percentage change with percentage points.
• Check a discount, tax figure or growth rate in seconds.
• Show your working when someone questions the number.

Common use cases

• Working out how much VAT is included in a total.
• Calculating month-on-month growth from two figures.
• Finding a pre-discount price from a sale price.

Privacy and your data

Everything you type or open here is processed by your own browser. No file, text or result is uploaded to a server, stored in a database or shared with anyone, and closing the tab clears it completely.

Frequently asked questions

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