Calculators

Percentage Calculator

Percentages come up everywhere — discounts, tips, taxes, test scores, price changes. This page bundles the three most common percentage calculations so you can get the answer without thinking about the formula.

What is X% of Y?

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X is what percent of Y?

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Percentage change from old to new

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How to use

  1. What is X% of Y: enter both numbers to get the portion (e.g. 15% of $80 = $12).
  2. X is what percent of Y: find the share (e.g. 12 out of 80 = 15%).
  3. Percentage change: compare an old value to a new value to get the increase or decrease as a percent.

Frequently asked questions

How do I calculate a percentage increase?

Subtract the old value from the new value, divide by the old value, then multiply by 100. For example, from $50 to $65: (65 − 50) ÷ 50 × 100 = 30% increase.

Why can percentage change be negative?

A negative result means the value decreased. The calculator shows the direction explicitly so there is no ambiguity.

Is a 50% increase the same as a 50% decrease?

No. A 50% increase from 100 gives 150, but a 50% decrease from 150 brings you back to 75, not 100 — percentages are relative to their starting point.

Pre-calculated answers

Skip the typing — we already ran the percentage calculator for the most common questions:

Show all 110 answers
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