Common percentage calculations

What is 10% of 100?

10% of 100 = 10

What is 20% of 50?

20% of 50 = 10

What is 15% of 200?

15% of 200 = 30

5 is what % of 20?

5 is 25% of 20

% increase from 80 to 100?

80 to 100 = +25%

% decrease from 200 to 150?

200 to 150 = −25%

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage divided by 100. For example, 20% of 500 = 500 × 0.20 = 100.

How do I calculate percentage change?

Percentage change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result is an increase, a negative result is a decrease.