Percentage Calculator
Free percentage calculator. Work out what percent one number is of another, percentage increase or decrease, and percentage change — all in one simple tool.
Every percentage question, one tool
Three of the most common percentage problems, solved live as you type: finding a percentage of a number, figuring out what percent one number is of another, and calculating the percentage increase or decrease between two values.
The formulas
- X% of Y = (X ÷ 100) × Y
- A is what % of B = (A ÷ B) × 100
- Percent change = ((new − old) ÷ old) × 100
Frequently asked questions
How do I calculate a percentage of a number?⌄
Multiply the number by the percentage divided by 100. For example, 15% of 200 is 200 × 0.15 = 30.
How do I find the percentage change between two numbers?⌄
Subtract the old value from the new value, divide by the old value, and multiply by 100. A negative result means a decrease.
How do I work out what percent one number is of another?⌄
Divide the first number by the second and multiply by 100. For example, 30 out of 120 is (30 ÷ 120) × 100 = 25%.
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