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Percentage calculator

Find a percentage, compare a part to a whole, or explore percentage changes with a live equation.

Live calculation30

20% of 150 = 30

The bar shows the percentage of one whole.

Processed on your device

How it works & useful details

How it works & limits

Choose a percentage mode and enter two values. Percentage change is (new − starting) ÷ |starting| × 100; it is undefined for a zero starting value. Negative starting values use their absolute magnitude.

Inputs are finite numbers from −1e12 to 1e12. Decimal results use floating-point arithmetic and are rounded to 12 significant digits.

Your working space

Change the values to explore the preview. Use the action below to create a copyable, downloadable result. All calculations stay on this device; refreshing clears your work.