Calculatoo

Percentage Calculator

Choose what you want to work out, enter two numbers and see the answer straight away.

Updated

Embed this calculator

Paste this code into your page. The calculator runs inside the frame and links back to the full version.

Keep the credit link in place. Do not resell the calculator.

Formulas

  • A% of B: result = A × B ÷ 100
  • A is what % of B: result = A ÷ B × 100 (B cannot be zero)
  • % change from A to B: result = (B − A) ÷ |A| × 100 (A cannot be zero)

Worked examples

  • 15% of 200: 15 × 200 ÷ 100 = 30.
  • 30 is what percent of 200: 30 ÷ 200 × 100 = 15%.
  • Change from 80 to 100: (100 − 80) ÷ 80 × 100 = +25%. From 100 to 80: (80 − 100) ÷ 100 × 100 = −20%.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 15 × 200 ÷ 100 = 30.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 is 30 ÷ 200 × 100 = 15% of 200.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value and multiply by 100. Going from 80 to 100 is a 25% increase. The old value cannot be zero.

How we calculate

Related calculators