Mathematics
Increase by a Percentage
Add a percentage to a starting value.
Let’s calculate.
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THE IDEA, SIMPLY
How it works
Add a percentage to a starting value.
FORMULA
Result = number × (1 + percent / 100)
A worked example
100 increased by 15% gives 115.
Formula & detailed explanation
Starting value and percentage must be nonnegative.
Calculations use decimal arithmetic with 40 significant digits internally. Choose 0–8 decimal places for the displayed result. Trailing zeros are omitted. Rounding affects only the displayed and copied result; very small values may round to zero. Accepted inputs have up to 100 characters and magnitudes from 10⁻¹⁰⁰ to 10¹⁰⁰, plus zero.