MrTools
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Percentage Calculator

Calculate a percentage, a percentage ratio or percentage change with clear formulas.

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Percentage workspace
Result—

Results are rounded for display to a maximum of 8 decimal places.

01 · Guide

How to use it

Choose one of three formulas: x% of y = x ÷ 100 × y; x is what percent of y = x ÷ y × 100; or change = (new − old) ÷ |old| × 100. Results display up to eight decimal places.

  1. Choose the percentage calculation.
  2. Enter both finite numbers.
  3. Calculate and review the formula and rounded result.

02 · Answers

Frequently asked questions

How is percentage change calculated?+

The tool divides new minus old by the absolute old value and multiplies by 100. An old value of zero is undefined.

Does my input leave this device?+

No. The operation runs locally in this browser and MrTools does not receive the entered data.

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