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Utility

Percentage Calculator

Free percentage calculator. Find what percentage X is of Y, calculate percentage change, and work out X% of any number instantly.

✓ Free to use ✓ Instant results ✓ Mobile friendly ✓ No sign-up needed
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① What is X% of Y?
= 30
② X is what % of Y?
= 15%
③ % Change from X to Y
= +25%
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How to Calculate Percentages

Percentages are used everywhere — from calculating discounts and tax to understanding statistics and pay rises. Our three-in-one percentage calculator covers the most common scenarios.

Common Percentage Formulas

  • X% of Y: Result = (X ÷ 100) × Y
  • X is what % of Y: Percentage = (X ÷ Y) × 100
  • % Change: Change = ((New − Old) ÷ Old) × 100

Frequently Asked Questions

How do I calculate a 20% discount?+
Enter X=20, Y=original price in calculator ①. The result is the discount amount. Subtract from the original price to get the sale price.
What is percentage change?+
Percentage change measures how much a value has increased or decreased relative to its original value. A positive result is an increase; a negative result is a decrease.
How do I calculate VAT?+
In the UK, VAT is 20%. To find VAT on a price: use calculator ①, enter X=20, Y=net price. To find the VAT-inclusive price, multiply by 1.20.

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