Number base converter
Convert integers exactly between bases 2–36, including negative and very large values, with common base results shown together.
Percentage calculator
Find a percentage of a number, calculate what share a part represents, or measure the percentage change between two values.
Percentage of a number
What percentage is it?
Percentage change
About this tool
Find a percentage of a number, calculate what share a part represents, or measure the percentage change between two values.
How to use
The three calculators work independently. Percentage of a number multiplies the percentage by the total and divides by 100. Share divides the part by the total. Change divides the difference by the absolute original value.
Results update as you type. An error in one card does not affect the others. Share and change cannot use a zero denominator. Results show up to 12 significant digits and are not intended for exact financial bookkeeping.
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