Percentage Calculator
Calculate percentages
Solve the most common percentage calculations —X% of a number, the change between two values, what percentage an amount represents or the original number— for discounts, increases, grades or price comparisons. You only need the numbers for the case you choose.
Calculate percentages instantly
Result
Result
12
Formula version: 1.0.0
How to use the percentage calculator
- Choose what to calculate: X% of a number, a change, a proportion or the original number.
- Enter the values requested; you can use a comma or a dot for decimals.
- Check the result, which updates instantly, and copy it if you need it.
Percentage formulas
X% of N = N × X / 100 · Change = (B − A) / |A| × 100
What each variable means
- N
- reference number
- X
- percentage
- A
- starting value
- B
- final value
A percentage expresses a proportion out of 100. To find what percentage an amount is, divide it by the total and multiply by 100.
Percentage calculation example
15% of 80 is 12. If a price goes from 50 to 65, the increase is 30%: (65 − 50) / 50 × 100.
Illustrative example with the data shown; not a guaranteed outcome.
Assumptions and limitations
- Percentage change is calculated on the absolute value of the starting value.
Frequently asked questions
How do I calculate a discount?
Calculate X% of the price and subtract it from the original price. For example, 20% of €50 is €10, so you would pay €40.
Why doesn't +10% then −10% give the same value?
Because each percentage applies to a different base: 100 + 10% = 110, and 110 − 10% = 99.
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See basic finance calculatorsIndicative result for information only; not financial or tax advice. Read the legal notice · How we calculate results
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