Percentage Calculator Free
Find a percentage of a number, a percentage change, or what one number is of another.
What is X% of Y?
X is what percent of Y?
Percentage increase or decrease
How to use this tool
- 1Pick the type of calculation you need.
- 2Enter your two numbers.
- 3Read the result, shown with the working behind it.
- 4Change either value to recalculate instantly.
About this tool
Percentages come up in three distinct shapes and people mix them up constantly. There is finding a percentage of something, which is discounts, tips and tax. There is expressing one number as a percentage of another, which is marks, conversion rates and market share. And there is percentage change, which is price rises, salary increases and growth figures — the one that trips people most, because the answer depends entirely on which number you treat as the baseline. A rise from 40 to 50 is a 25 percent increase, but a fall from 50 to 40 is a 20 percent decrease, even though the gap is identical. This calculator separates the three cases clearly and shows the working, so you can check the logic rather than just trusting a number.
Frequently Asked Questions
Why are percentage increase and decrease not symmetrical?
+
Because each is measured against its own starting value. Going up 25 percent and back down 25 percent does not return you to where you began.
How do I calculate a discount?
+
Find the percentage of the original price, then subtract it. The calculator shows both the discount amount and the final price.
What is a percentage point?
+
A percentage point is the plain difference between two percentages. Moving from 10 percent to 12 percent is two percentage points, but a 20 percent increase.