Percentage calculator
Four everyday percentage calculations on one page. Type numbers and see the results instantly.
- What is%of?
- is what % of?
- Fromto
- ±%IncreasedDecreased
How to use
- Fill in the blanks on the line you need. Commas (1,000) and a % sign are fine.
- Results appear as you type, next to the line (below it on a phone). Press Copy to copy a number.
- The percent change line shows how much the second value rose or fell from the first.
- The last line shows the value after both increasing and decreasing by the same percent.
FAQ
What formulas are used?
X% of A is A × X ÷ 100. A as a percent of B is A ÷ B × 100. Percent change is (new − old) ÷ old × 100. Increasing A by X% is A × (1 + X ÷ 100), and decreasing it is A × (1 − X ÷ 100).
What is the difference between percent and percentage points?
Percentage points are the simple difference between two percentages. A rate going from 2% to 3% rose by 1 percentage point, which is a 50% increase. Entering 2 and 3 in the percent change line gives 50%.
Does a 20% increase followed by a 20% decrease give the original value?
No. 100 increased by 20% is 120, and 120 decreased by 20% is 96, because the second step uses 120 as its base.
How precise are the results?
Results are rounded to at most six decimal places. If a calculation would divide by zero (a base of 0 in the percent-of or percent-change lines), it shows that it cannot be calculated. With a negative starting value, percent change uses its absolute value as the base.
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