Percentage Calculator
Find X% of a number, what percent one value is of another, or the total from a percentage.
Runs in your browser — nothing is uploadedEnter values
Calculate
Result
How it's calculated
Result = (Percentage ÷ 100) × Value
= (20 ÷ 100) × 150 = 30
About Percentage Calculator
Percentages are everywhere — exam marks, sales tax, commissions, interest rates, survey results and shopping discounts. This calculator answers the three most common percentage questions: what is X% of a number, what percent is one number of another, and what is the total when you know a part and its percentage.
Each result shows the formula used, so you can check the working or learn how to do it by hand. Calculations happen instantly in your browser as you type.
When to use it
- Working out exam scores and grades as a percentage.
- Calculating commission, tax or service charges on an amount.
- Finding what share of a budget or target has been reached.
- Checking percentages in reports and survey results.
Tips for better results
- Remember: X% of Y = Y% of X — 8% of 50 is the same as 50% of 8, which is often easier.
- To find 10%, move the decimal point one place left; build other percentages from there.
- Use the Percentage Increase/Decrease calculator when comparing an old and a new value.
How to use the Percentage Calculator
- Choose what you want to calculate.
- Enter the two values.
- Read the result and the worked formula.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30.
How do I find what percent X is of Y?
Divide X by Y and multiply by 100. For example, 30 is (30 ÷ 150) × 100 = 20% of 150.
How do I find the total from a percentage?
Divide the known part by its percentage and multiply by 100. For example, if 30 is 20% of a total, the total is 30 ÷ 20 × 100 = 150.
Can percentages be more than 100%?
Yes. A value can be more than 100% of another — for example 150 is 150% of 100. This often appears when comparing growth or targets.