Percentage Calculator
Calculate a percentage of a value, a percentage change, or the original before a percentage increase.
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How to use this tool
- Choose the interpretation of A and B before entering the values.
- Calculate the result with the formula shown.
Things to know
- Percentage change is relative to A. Zero reference values are rejected; negative inputs are allowed where the formula is defined.
- Two bounded decimal values and one selected formula. Zero denominators are rejected; fixed-size result.
- Use no more than 200,000 characters across the input and settings.
- Bounded decimal inputs mean at most 120 characters, zero or a magnitude from 10^-100 to 10^100. Arithmetic uses 40-digit precision; exponent suffixes are checked before parsing.
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