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Percentage Calculator

Calculate percent of a value, percentage rate, or percentage change.

Percentage Calculator
Local input
Output
Processing…
Processed locally in your browserNo input history is saved
About this tool

Made for the task at hand.

Handle the three everyday percentage tasks with the formula shown alongside each answer and explicit zero-division checks.

How to use

  1. Enter X on the first line and Y on the second.
  2. Choose percent-of, rate, or percentage-change mode.
  3. Read the formula and calculated result.
Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.
Common questions
How is percentage change calculated?

It uses (new − old) / |old| × 100, so a decrease is negative and an increase is positive.

Can the starting value be zero?

Not for percentage change, because division by zero makes the change undefined; the tool reports this directly.

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