Tokkucal
Percentage Calculator
A four-in-one percentage tool: find X% of Y, work out what percentage X is of Y, and calculate percentage increase or decrease between two values — all in one clean tabbed calculator.
About the Percentage Calculator
How to Use
- Pick the calculation you need: a percentage of a number, what percentage one value is of another, or a percentage increase/decrease.
- Fill in the two values for that mode.
- Press Calculate to see the result instantly.
Formula
X% of Y = X × Y ÷ 100
X is what % of Y = X ÷ Y × 100
% change = (New − Old) ÷ Old × 100
Example
20% of 250 = 50. And 50 is 20% of 250. If a value rises from 200 to 250, that is a 25% increase.
Detailed Explanation
Percentages express a number as a fraction of 100, which makes it easy to compare quantities of different sizes. Percentage increase and decrease use the same underlying formula — the sign of the result tells you the direction — so this calculator combines both into a single "change" mode.
Frequently Asked Questions
How do I calculate a percentage increase?
Use the % Increase / Decrease tab, enter the old and new values, and the calculator will show the percentage change along with whether it is an increase or decrease.
Can I calculate what percentage one number is of another?
Yes, use the 'X is what % of Y' tab. For example, entering 50 and 250 tells you that 50 is 20% of 250.
Can the of-value be zero?
The of-value can be zero for the 'X% of Y' mode, but it cannot be zero when it is used as a divisor, such as in the 'is what percent' and '% change' modes.