Math
Percentage Calculator
How to use this tool
- 1
Pick the calculation from the list.
- 2
Enter the two values (comma or dot, Arabic digits accepted).
- 3
Read the result and the detailed formula.
- 4
Copy the result or change the number of decimals.
Help
- Six calculations in one: X% of Y, X is what % of Y, % change between two values, increase or decrease an amount, find the total from a percentage, and difference in percentage points.
- Each calculation is pre-filled with an example: just change the values and the result updates live, with the formula applied to your numbers.
- The maths is exact (decimals, no 0.1 + 0.2 = 0.30000000000000004). You choose how many decimals are shown (0 to 8).
- Change is always measured against the starting value; a zero starting value is flagged instead of returning a meaningless result.
Related guide : Percentages, VAT and discounts: the calculations everyone gets wrong
Frequently asked questions
What is the difference between “percentage points” and “percent”?
A rate moving from 4% to 5.5% gains 1.5 percentage points; in relative terms it rose by 37.5% (1.5 ÷ 4). The tool gives both to avoid confusion.
Why does +25% then −25% not bring me back to the start?
Because each percentage applies to a different base. 100 + 25% = 125, then 125 − 25% = 93.75. To return to 100 from 125 you need a 20% drop.
How do I find the price before a percentage increase?
Use “Find the total” with the current price and (100 + rate) as the percentage: a price of 230 after +15% was 230 ÷ 115 × 100 = 200 before the rise.
Written and verified by the MaxyTools team · Updated on
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