What is X% of Y?
Calculate percentage of a number
This calculator helps you quickly find what a percentage of a number is.
It is one of the most commonly used calculations in everyday life and business.
You can use it for discounts, VAT, commissions, interest, and pricing calculations.
Understanding this calculation is the foundation of all percentage-based maths.
Understanding your result
The result shows the portion of the number represented by the percentage.
For example, 25% means 25 out of every 100.
This allows you to quickly calculate proportions and values.
How the calculation works
Formula: (Percentage ÷ 100) × Number
The percentage is converted into a decimal and multiplied by the number.
Where this is used
- Discounts: Calculate sale prices
- VAT: Add tax to prices
- Commissions: Calculate earnings
- Finance: Analyse percentages and returns
Examples
Example 1:
20% of £150 = £30
Example 2:
15% of £80 = £12
Example 3 (Business):
10% commission on £500 = £50
Example 4 (VAT):
20% VAT on £100 = £20
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Frequently asked questions
How do I calculate a percentage?
Divide by 100 and multiply by the number.
What is 20% of 150?
30.
Where is this used?
Pricing, VAT, commissions and finance.