About this Percentage Calculator
Use this percentage calculator for school marks, discounts, tax, tips, exam scores and everyday maths. Pick a mode, type your numbers and get the answer instantly with the formula shown, so you can check your work.
How to use it
- Choose what you want to calculate.
- Type your two numbers.
- Read the answer and the formula used.
Read next: What Grade Is 45 out of 60? The Fastest Way to Turn Any Score into a Percentage
Frequently asked questions
How do I find what percentage 45 is of 80?
Choose 'X is what % of Y', enter 45 and 80. The answer is 56.25%.
How is percentage change calculated?
(New value - Old value) / Old value x 100. A positive result is an increase, negative is a decrease.
Is this calculator free?
Yes, completely free and it works on any phone or computer.