Everyday Mathematics

Percentage Calculator

Calculate a percentage of a value or measure percentage change between two numbers.

How this calculator works

Choose the calculation type, then enter the two required values. The formula changes automatically based on the selected mode.

Percentage = Part ÷ Whole × 100

Use realistic inputs

Enter current, realistic figures for the most useful estimate.

Frequently asked questions

Can I use decimal values?

Yes.

What happens if the old value is zero?

Percentage change from zero is undefined, so the calculator will ask for a non-zero starting value.

Can this calculate discounts?

Use the first mode to calculate the discount amount, then subtract it from the original price.

More useful tools, one growing platform.

Explore calculators for vehicles, finance and everyday decisions.

Explore all tools