Percentage Calculator
Four common percentage tasks: what % A is of B, B% of A, percent change, and ratio allocation.
What percent is A of B
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A's B%
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Percent change from A to B
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Allocate by ratio
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How to use
- Pick a type and fill its boxes: %A of B, B% of A, percent change, or ratio allocation.
- Results update live under each block, no button needed.
- For allocation, enter comma-separated ratios in "Ratios" (e.g. 1,2,3).
- Tip: percent change = (new-original)/original×100%; positive means growth.
FAQ
What do positive/negative mean?
Positive means increase, negative means decrease. Formula: (new - original)/original × 100%.
How to use ratio allocation?
Enter comma-separated numbers in "Ratios" (e.g. 1,2,3); the tool splits the total by their proportion.