Percentage Calculator — % of a Number & % Change

Percent (%)

of number

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To find X% of Y, divide X by 100 and multiply by Y — for example, 15% of 200 = 15 ÷ 100 × 200 = 30. Use the calculator below for any percentage, the reverse (“what percent is X of Y”), or a percentage increase or decrease. Updated June 2026.

What is X% of Y?

10% of 100 15% of 200 20% of 500 25% of 1,000 5% of 50 30% of 1,500 40% of 2,000 50% of 100

What percent is X of Y?

30 of 200 50 of 200 25 of 100 150 of 500 80 of 400 20 of 80

Increase or decrease by a percentage

200 + 15% 1,000 + 20% 50 + 10% 200 − 15% 1,000 − 25% 80 − 30%

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