Tooltoss

Percentage Calculator

Five everyday percentage calculations in one place – percent of a number, percent ratio, percent change, and adding or subtracting a percentage. Results update as you type.

% of=—
is what % of=—
% change fromto=—
increased by%=—
decreased by%=—

How to calculate a percentage

  1. Find the sentence that matches your question.
  2. Type the two numbers into its boxes.
  3. Read the result and the formula next to it.

Frequently asked questions

Q. How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 80 = 80 × 15 / 100 = 12.
Q. How do I calculate percentage change?
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% increase.
Q. Why isn't a 20% rise followed by a 20% fall back to the start?
Because the second percentage applies to a bigger number. 100 + 20% = 120, then 120 − 20% = 96.

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