Percentage Calculator
What is X % of Y, what percent is X of Y, or what is the percent change?
Spec sheet
percent_basic · v1.0.0Percent arithmetic
- 01
X % of Y = X ÷ 100 × Y - 02
X is what % of Y = X ÷ Y × 100 - 03
% change = (new − old) ÷ |old| × 100 - 04
Y ± X % = Y × (1 ± X ÷ 100)
- Percent change is undefined when the starting value is 0.
- Elementary percentage arithmeticformula
Worked example
computed by the same formula15 % of 200
- Calculate
- X % of Y
- X
- 15
- Y
- 200
- Result
- 30
- Calculation
- 15 % of 200 = 30
Questions
How is the percentage calculated?
›
Percent arithmetic. X % of Y = X ÷ 100 × Y · X is what % of Y = X ÷ Y × 100 · % change = (new − old) ÷ |old| × 100 · Y ± X % = Y × (1 ± X ÷ 100)
Example: 15 % of 200?
›
Result: 30; calculation: 15 % of 200 = 30.
Is percent change the same as percentage points?
›
No. Going from 10 % to 15 % is a change of 5 percentage points, but a 50 % percent change.
What does this calculator not cover?
›
Percent change is undefined when the starting value is 0.
Where do the numbers come from?
›
Sources: Elementary percentage arithmetic. The formula is versioned (percent_basic v1.0.0) and covered by automated tests.
Is my data stored?
›
No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.
Also searched aspercentage calculator · what is 15 percent of 200 · percent change · percentage increase · what percent of · percent off · calculate percentage
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