Toolvemi.

Percentage Calculator

Four common percentage questions in one place. Fill in any block and the answer appears immediately.

Calculate a percentage

Calculated instantly in your browser.

Browser-based

What is X% of Y?

% of
Result—

Enter the values above.

X is what percent of Y?

of
Result—

Enter the values above.

Percentage change from X to Y

to
Result—

Enter the values above.

Increase or decrease a number by a percentage

Result—

Enter the values above.

How to use it

  1. Pick the question that matches your problem.
  2. Enter the two numbers. Decimals and negative numbers work.
  3. Read the answer below the inputs. It updates as you type.

Examples

  • 15% of 200 = 30
  • 30 is 15% of 200
  • 80 → 100 is a +25% change
  • 50 decreased by 20% is 40 (a 20% discount)

Percentage change is (new − old) ÷ |old| × 100, so it is undefined when the starting value is 0. Going from 100 to 80 is −20%, but going back from 80 to 100 is +25%.

Browse all tools