Percentage Calculator
Three quick tools: percent of a number, what percent X is of Y, and percentage change between two numbers.
Percentage of a number
What percentage is X of Y?
Percentage increase or decrease
How percentage calculations work
A percentage is a way of expressing a number as a fraction of 100. To find a percentage of a number, divide the percentage by 100 and multiply by the number — for example, 20% of 200 is (20 / 100) × 200 = 40.
To find what percent one number is of another, divide the part by the whole and multiply by 100. To find percentage change, subtract the old value from the new value, divide by the old value, and multiply by 100 — a positive result is an increase, a negative result is a decrease.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage, then divide by 100. For example, 15% of 80 is (80 × 15) / 100 = 12.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value, then multiply by 100. A negative result means a percentage decrease.
What is the difference between percentage points and percent?
Percentage points measure the raw difference between two percentages (e.g. 40% to 50% is 10 percentage points), while percent change measures the relative change (that same move is a 25% increase).