Percentage Calculator
Three percentage calculators in one. Find X% of Y, work out what percentage X is of Y, or compute the percentage increase / decrease between two values. Switch tabs to pick the calculation you need.
How to use
- 1
Pick the right tab
Use X% of Y to find a portion of a value, X is what % of Y to express one value as a percentage of another, or % change for the relative change between two numbers.
- 2
Enter the inputs
Each tab has two inputs. Decimals, negatives and thousands separators are accepted.
- 3
Read the result
The result updates live as you type. The % change tab also shows the absolute change and a coloured Increase / Decrease badge.
- 4
Copy the answer
Each tab has a Copy button that puts a one-line summary on your clipboard.
Common use cases
- Work out a 15% tip on a $86 bill.
- Express 30 out of 200 survey responses as a percentage.
- Calculate the year-over-year revenue growth from $1.2M to $1.5M.
- Quantify a price drop from $89.99 to $74.99 as a percentage decrease.
Limitations
- This calculator produces an estimate only and is not professional financial, tax or investment advice. Always confirm the underlying formulae with your accountant, bank or financial advisor before making decisions.
- The % change tab divides by the absolute value of X. If X is zero the result is undefined and shows 0%.
- Negative inputs are allowed but may produce surprising results — read the formula note.
- The tool does not compute percentage points (a change from 10% to 12% is a 2 percentage-point change, not 20%).
Frequently asked questions
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