Percentages are just fractions out of a hundred, which is why dividing the part by the whole and multiplying by 100 gives the answer every time. It is the everyday tool for discounts, tips, tax, commissions, exam scores and survey results. For the special case of comparing an old and a new value, use the Percentage Increase Calculator.
Calculator
Formula used
X% of Y = Y × X ÷ 100 · X as % of Y = X ÷ Y × 100
How to use the Percentage Calculator
- Enter the percentage and the number in the first panel.
- Read the result for X% of Y.
- In the second panel enter the part and the whole.
- Read the percentage one number represents of the other.
About this tool
The Percentage Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Working out a discount on a sale price.
- Calculating commission or a tip.
- Converting test scores into percentages.
- Finding the share of a budget or survey response.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
How do I work out a percentage without a calculator?
Divide the part by the whole, then multiply by 100. For example 36 / 240 = 0.15, which is 15%.
Can a percentage be more than 100?
Yes. It just means the part exceeds the reference whole, which is common in growth figures and mark-ups.
Related tools you may like
Multiplication Table GeneratorMath · The Multiplication Table Generator builds a times table for any number you choose, over an…GPA CalculatorMath · The GPA Calculator turns a list of courses into a grade point average on the 4.0 scale. Ad…Fraction CalculatorMath · The Fraction Calculator does the arithmetic that is easy to get wrong by hand. Enter two f…Average CalculatorMath · The Average Calculator takes a list of numbers and returns the statistics that matter: cou…Grade CalculatorMath · The Grade Calculator answers the end-of-term question: what do I need on the final? Enter …Percentage Increase CalculatorMath · This Percentage Increase Calculator does two related jobs. The first panel computes the pe…Email ValidatorText · The Email Validator checks an address the way a careful mail server would: it verifies the…Age CalculatorDate · This Age Calculator converts a date of birth into a precise age down to the day. Instead o…