Percentage Calculator

Solve every common percentage problem: X% of Y, what percent one number is of another, the whole from a part and a percentage, and percentage change.

What is the Percentage Calculator?

A percentage expresses a number as a fraction of 100. It is used for marks, discounts, interest, taxes, growth and much more.

How does it work?

Pick the question you want to answer and enter the two numbers. The calculator applies the matching formula instantly.

Formula

X% of Y = X ÷ 100 × Y
X as % of Y = X ÷ Y × 100
Whole = X × 100 ÷ Y
Change % = (Y − X) ÷ |X| × 100

Example

15% of 2,000 is 300. 45 out of 60 is 75%. If 30 is 20% of a number, the number is 150.

Frequently asked questions

How do I calculate percentage of marks?

Divide marks obtained by total marks and multiply by 100. For example, 450 out of 500 is 90%. The Marks Percentage Calculator handles multiple subjects.

Is X% of Y the same as Y% of X?

Yes. 8% of 50 equals 50% of 8 — both are 4 — which can make mental math easier.

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