Calculate percentage increases, decreases, fractions, and proportions.
What is X% of Y finds a part of a total: 15% of 200 is 30. It's the one for tips, tax and discounts.
X is what percent of Y finds a share: 30 out of 200 is 15%. Use it for scores, survey results and budgets.
Percentage change from X to Y measures growth or decline: going from 100 to 150 is +50%, and from 150 back to 100 is -33.33%. Notice those aren't the same size; a percentage change is always measured against the starting value.
If an interest rate goes from 4% to 5%, it has risen by one percentage point, but by 25% in relative terms (1 is a quarter of 4). Reports mix these up all the time. This calculator's change box gives the relative change, so 4 to 5 shows +25%.
Multiply the number by the percentage and divide by 100. 15% of 80 is 80 × 15 / 100 = 12.
Subtract the old value from the new one, divide by the old value and multiply by 100. From 50 to 65: (65 - 50) / 50 × 100 = 30%.
A calculation divided by zero, for example asking what percent of 0 a number is. Change the zero to another number.
Answers are shown to up to four decimal places.
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