Percentage Calculator
Percentages come up everywhere — discounts, tips, growth rates, and grades. This calculator handles the three most common questions in one place: what is X% of a number, what percent one number is of another, and the percentage increase or decrease between two numbers.
- Free — no sign-up
- Private — runs in your browser
- Instant results
How to use the Percentage Calculator
- 1Pick a calculation. Choose the type of percentage question you're answering.
- 2Enter your numbers. Fill in the two values for that calculation.
- 3Read the answer. The result updates instantly, with the formula shown so you can check the math.
Examples
Finding X% of a number (a discount)
What is 20% of $75?$15A 20% discount on a $75 item is $15 off, leaving $60. The formula is 75 × 0.20 = 15.
Percentage change (growth)
Old: 8,000 visits
New: 10,200 visits+27.5% increaseTraffic rose from 8,000 to 10,200. The change is (10,200 − 8,000) ÷ 8,000 × 100 = 27.5%.
Frequently asked questions
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100. For example, 30 is 75% of 40 because 30 ÷ 40 × 100 = 75.
How do I calculate percentage change?
Percentage change = (New − Old) ÷ Old × 100. Going from 200 to 250 is a 25% increase.
Why isn't a 50% drop cancelled by a 50% rise?
Because each percentage applies to a different base. Drop 100 by 50% and you get 50; raise 50 by 50% and you only reach 75, not 100. Percentages are not symmetric, which is why a stock that falls 50% must then rise 100% to recover.