Percentage Calculator
Choose the type of percentage calculation, enter two numbers and see the result straight away.
This result is an estimate only. Check with your bank or the relevant authority before making decisions.
How it is calculated
Percent means per hundred.
- x% of y = x × y ÷ 100
- x is what % of y = x ÷ y × 100 (y cannot be 0)
- Add x% to y = y + y × x ÷ 100
- Subtract x% from y = y − y × x ÷ 100
Worked example
- 15% of 200 = 30
- 30 is what % of 200 = 15
- 200 plus 15% = 230
- 200 minus 15% = 170
Why your number may differ
Make sure you picked the right type of calculation, because x and y mean different things in each one. The result is shown to two decimal places.
Frequently asked questions
What does percent mean?
Percent means per hundred. 15% means 15 out of every 100.
How do I work out x% of y?
Multiply x by y, then divide by 100.
Why do I get an error when y is 0?
In the x is what % of y option, we divide by y. Dividing by zero is not possible.