Percentage Calculator
Solve every common percentage question in one place.
15% of 240
36
Value plus this percentage
276
Value minus this percentage
204
As a decimal multiplier
0.1500
240 × 15 ÷ 100 = 36
What does Percentage Calculator do?
Four calculators in one: what is X% of Y, X is what percent of Y, percentage change between two numbers, and adding or removing a percentage. Each mode shows the formula it used so you can check the working.
How to Use Percentage Calculator
- 1Pick a modeChoose the question you are trying to answer from the tabs.
- 2Enter your numbersFill in the two values. Decimals are fine.
- 3Read the resultThe answer and its formula appear as you type.
Key Features
- Four modes covering the questions people actually ask about percentages
- The formula and substituted values are shown with every answer
- Handles decimals and negative numbers correctly
- Explains the difference between percentage points and percent change
- Clear errors instead of NaN when a divisor would be zero
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For 15% of 240: 240 × 15 ÷ 100 = 36. The "percent of" mode does this for you.
What is the percentage change formula?
((new − old) ÷ |old|) × 100. From 80 to 100 is ((100 − 80) ÷ 80) × 100 = 25% increase. Using the absolute value of the old number keeps the sign meaningful when the starting value is negative.
What is the difference between percent and percentage points?
If a rate moves from 4% to 6%, that is a rise of 2 percentage points but a 50% increase. News reports mix these up constantly; the calculator labels both.
Why can a percentage increase be over 100%?
Because the increase is measured against the starting value. Going from 10 to 30 is a 200% increase — the number tripled. Only a decrease is capped, at 100%, because you cannot lose more than everything.
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