What is the Percentage Calculator?
A percentage calculator answers everyday questions like 'what is 15% of 2,400?' or 'what percent is 45 of 60?'. Cubestack has a mode for each common calculation so you don't need to remember formulas.
How to use it
- 1
Choose a mode
Pick the type of percentage question.
- 2
Enter numbers
Type values A and B.
- 3
Calculate
Get the answer instantly.
Features
B% of A
Find a percentage of any number.
A is what % of B
Express one number as a percentage of another.
Increase and decrease
Add or subtract a percentage from a value.
Clear output
The answer appears the moment you click Calculate.
Popular uses
Shopping
Work out discounts and price changes.
Marks and grades
Convert exam scores into percentages.
Business
Calculate margins, growth and commissions.
Frequently asked questions
How do I calculate X% of Y?
Multiply Y by X and divide by 100. 15% of 2,400 = 2,400 × 15 ÷ 100 = 360.
How do I find what percent A is of B?
Divide A by B and multiply by 100. 45 of 60 = 45 ÷ 60 × 100 = 75%.
Why doesn't +10% then −10% return the same number?
The second percentage applies to a different base: 100 + 10% = 110, and 110 − 10% = 99.