Percentage calculator

Three common percentage calculations in one place — pick the one you need below.

These three boxes cover the percentage questions people actually search for, each solving a different direction of the same underlying math. The first finds a percentage of a number (useful for discounts or tips). The second finds what percent one number is of another (useful for grading or scoring). The third finds the percentage change between two values (useful for tracking an increase or decrease over time).

Each box updates its answer instantly as you type — no submit button, just live results so you can adjust the numbers and immediately see how the answer shifts.

What is X% of Y?

What is % of ?
= 30

X is what percent of Y?

is what % of ?
= 20%

Percentage change from X to Y

From to ?
= +20%

A couple of worked examples

Say a shirt is $150 and it's 20% off. The first calculator above tells you the discount amount: 20% of 150 is 30, so you'd pay $120.

Or say you scored 30 out of 150 on something. The second calculator flips it around: 30 is 20% of 150 — that's your score as a percentage.

The third one is for tracking change over time — rent going from $150 to $180/month is a +20% increase, which is what that calculator would show you.

Percentage points vs. percent — what's the difference?

Going from 20% to 25% is a 5 percentage point jump, but it's a 25% increase relative to the original number. These get mixed up constantly. This tool calculates percent change (the second kind), not percentage points.

Negative numbers work fine here

All three boxes accept negatives if you need them — useful for the change calculator especially, since a decrease naturally comes out negative.