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HQ8T

Percentage Calculator

Solve common percentage problems quickly.

What is X% of Y?

What is% of?

450

18 × 2500 ÷ 100

X is what percent of Y?

is what % of?

86.4%

432 ÷ 500 × 100

Percentage increase / decrease

Fromto

▲ 25% increase

(1000 − 800) ÷ 800 × 100

Add or remove a percentage

%

1,100

1000 + 10% = 1000 × (1 + 10 ÷ 100)

How to use

  1. 1Find the question that matches yours, for example “What is X% of Y?”.
  2. 2Type your numbers into the boxes in that card.
  3. 3The answer appears instantly, with the formula used.
  4. 4Use the other cards for percentage change or adding and removing a percentage.

Frequently asked questions

How do I calculate X% of a number?

Multiply the number by X and divide by 100. For example, 18% of 2,500 = 2,500 × 18 ÷ 100 = 450.

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

Divide the part by the whole and multiply by 100. For example, 45 out of 60 = 45 ÷ 60 × 100 = 75%.

How is percentage change calculated?

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

How do I calculate marks percentage?

Use “X is what % of Y”: put your marks as X and the maximum marks as Y. For example, 432 out of 500 = 86.4%.

Why doesn't +10% then −10% bring me back to the start?

Because the second percentage is taken from a different number. 100 + 10% = 110, and 110 − 10% = 99.

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