Percentage Calculator

Runs in browser Utilities

Four calculators in one: X% of Y, X is what % of Y, percentage change between two values, and add/subtract a percentage — with step-by-step formulas.

Privacy: This tool runs entirely in your browser. Your input never leaves your device.

How to use Percentage Calculator

  1. Pick the calculation type.
  2. Enter X and Y.
  3. Read the result and the worked steps.

Percentage Calculator features

  • X% of Y, X is what % of Y, percentage change, increase/decrease, percentage difference
  • Step-by-step formulas with intermediate values
  • Related values (remaining share, multipliers, reverse change)
  • Accepts thousands separators and trailing % signs
  • Configurable rounding

Percentage Calculator example

Percentage change

Input:

from 240 to 300

Output:

+25% (difference 60): (300 − 240) ÷ 240 × 100

Frequently asked questions about Percentage Calculator

Which calculations are included?

X% of Y, X is what % of Y, percentage change from X to Y, X increased or decreased by Y%, and the symmetric percentage difference between two values.

What is the difference between percentage change and percentage difference?

Change is directional and relative to the starting value ((new − old) ÷ old). Difference is symmetric and relative to the average of the two values, used when neither value is the baseline.

Why is percentage change from 0 undefined?

Any change from zero would require dividing by zero. Use the absolute difference instead.

Can I control rounding?

Yes, set the decimal places. Formulas and steps show the intermediate values so you can verify the result.