Percentage Calculator
Calculate a percentage of a number, plus increases and decreases. Free, fast and easy to use.
How it works
Enter a percentage and a number to see what that percentage is worth. The calculator also shows the number increased and decreased by the same percentage, which is handy for VAT, tips, markups and discounts.
Formula
P % × N / 100
Worked examples
- Percentage (%): 20 · Of number: 49.99 → Result: 9.998
- Percentage (%): 15 · Of number: 80 → Result: 12
- Percentage (%): 7.5 · Of number: 1200 → Result: 90
Calculations run locally in your browser. Results are for information only — for engineering, electrical or financial decisions, verify the assumptions and applicable standards.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20 % of 150 is 150 × 20 / 100 = 30.
How do I add VAT to a price?
Multiply the net price by 1 plus the VAT rate. With 20 % VAT, a net price of €100 becomes €100 × 1.20 = €120.