Percentage & Percentage Difference Calculator

Four percentage problems in one tool — find a percentage, reverse it, measure change over time or compare two values.

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percentage-calculator — tool

Problem type

Value X

Value Y

Result

Result appears here automatically.

runs 100% client-side · your data never leaves the browser

how_to — percentage-calculator

How to use the percentage & percentage difference calculator

1Enter your numbers — realistic defaults are pre-filled.
2Results and the formulas behind them update automatically.
3Change any value to compare scenarios side by side.

Frequently asked questions

Percentage change compares a new value against its own starting point (growth or decline). Percentage difference compares two independent values against their average — neither is the "original".

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How to use the percentage & percentage difference calculator

Frequently asked questions

01What is the difference between percentage change and percentage difference?

02Why does percentage change use the absolute starting value?

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Need this done properly for your business?

How to use the percentage & percentage difference calculator

Frequently asked questions

01What is the difference between percentage change and percentage difference?

02Why does percentage change use the absolute starting value?

Related tools

Discount & Final Price Calculator

Profit Margin Calculator

Developer Hourly Rate Calculator

Project Time Estimator

Need this done properly for your business?