Percentage Calculator

How to use the percentage calculator

Pick a mode, type two numbers, and the answer appears instantly. Use “% of a number” for things like a discount or tax, “X is what % of Y” to turn a score into a percentage, and “% change” to compare an old value to a new one.

How do I work out a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.

How do I calculate a percentage increase or decrease?

Subtract the old value from the new one, divide by the old value, and multiply by 100. A move from 80 to 100 is a 25% increase.

What is the percentage difference between two numbers?

Take the difference between the two numbers, divide by their average, then multiply by 100. (Percentage change instead divides by the original value — use the “% change” mode for that.)