Percentage Calculator
Calculate a percentage of a number, a discount, a percentage change, a VAT-inclusive price, or work backwards from a final amount.
What is X% of Y?
20% of 150 is 30.
Results update as you type.
Formula
Each tab uses a single one-line formula:
- % of:
result = (percent / 100) × value - What %:
percent = (part / whole) × 100 - % change:
percent = ((to − from) / from) × 100 - Add / Subtract %:
result = value × (1 ± percent / 100) - Reverse %:
original = result / (percent / 100)
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Frequently asked questions
How do I work out a percentage of a number?▾
Use the % of tab. Enter the percentage and the value. For example, 20% of €150 returns 30. This is the most common percentage operation and is used for everything from VAT to discounts.
How do I calculate a percentage change?▾
Use the % change tab. Enter the starting (from) and ending (to) values. Going from 100 to 150 returns +50% (an increase); 100 to 50 returns −50% (a decrease).
How do I add VAT to a price?▾
Use the Add/Subtract % tab. Enter the net price as the value, your country's VAT rate as the percent, and choose 'add'. To work the other way — extract the net price from a VAT-inclusive total — use the Reverse % tab. VAT rates vary across the EU; our VAT Calculator (coming soon) covers the main rates.
What's the difference between a percentage and percentage points?▾
A percentage is a relative change; a percentage point is an absolute one. A move from 5% to 8% is a 3 percentage-point increase but a 60% relative increase. The % change tab on this calculator returns the relative figure.
How do I reverse a percentage?▾
Use the Reverse % tab. If €60 is 75% of the original, the original is €60 ÷ 0.75 = €80. This is the standard way to extract a net price from a VAT-inclusive total or recover an original number after a discount.