Percentage of a Number Calculator

This is the most common percentage question: what is X% of Y? Enter the percentage and the number. The calculator multiplies the number by the percentage as a decimal and shows the working. It is the dedicated version of the first tab on the homepage calculator.

Formula

Result = (P ÷ 100) × N

Step-by-step

Convert the percentage to a decimal by dividing by 100. 15% becomes 0.15.
Multiply that decimal by the number.
The product is P% of the number. 0.15 × 200 = 30.

Practical examples

15% of 200

0.15 × 200 = 30.

12.5% of 80

0.125 × 80 = 10.

10% of 1,000

0.10 × 1,000 = 100. Ten percent is one tenth of the number.

When to use this calculator

Tips, tax estimates, commission, and any “what is this percent of that amount?” question.

Common mistakes

Multiplying by the percentage without dividing by 100 (15 × 200 is not 15% of 200).

Frequently asked questions

How do I find 20% of a number quickly?

Find 10% by moving the decimal point one place left, then double it. 20% of 85 is 8.5 × 2 = 17.

Does this work with negative numbers?

Yes. 10% of −200 is −20. The sign follows ordinary arithmetic.

Percentage of a Number Calculator