DevConvertor

Percentage Calculator

Four common percentage calculations in one place — X% of Y, what percentage X is of Y, percentage increase/decrease from X to Y, and percentage difference between X and Y — each showing the exact formula used.

Result

10

(20 ÷ 100) × 50 = 10

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Features

  • Four calculation modes: X% of Y, X is what % of Y, percentage change, percentage difference
  • Every result shows the exact formula used, not just the answer
  • Handles negative numbers and percentage decreases correctly
  • Copy the result to your clipboard

How to use

  1. Pick the calculation you need.
  2. Enter the two numbers involved.
  3. The result and its formula appear automatically.

Example

20% of 50 → 10, from (20 ÷ 100) × 50

Change from 50 to 75 → +50%, from ((75 − 50) ÷ 50) × 100

FAQ

What's the difference between percentage change and percentage difference?
Percentage change is directional and relative to a starting value — going from 50 to 75 is a +50% change, but going from 75 to 50 is a −33.3% change, even though the numbers are the same two values. Percentage difference is symmetric: it measures how far apart two numbers are relative to their average, with no notion of which one came first.
Why does percentage change fail when X is 0?
Percentage change is defined relative to the starting value, and dividing by zero is undefined — there's no meaningful "percent change from zero."