Percentage Calculator
Select a calculation type and enter your values.
Percentage Formulas
What percent of B is A?
% = (A ÷ B) × 100
What is A% of B?
Result = (A / 100) × B
Increase B by A%
Result = B × (1 + A/100)
Frequently Asked Questions
What is 20% of 150?
20% of 150 = (20 ÷ 100) × 150 = 30. Quick mental math: 10% of 150 is 15, so 20% is 30.
How do I add a percentage to a number?
Multiply the number by (1 + percentage/100). To add 15% to $200: $200 × 1.15 = $230. To add 7.5% sales tax to $50: $50 × 1.075 = $53.75.
What percentage is 45 out of 60?
(45 ÷ 60) × 100 = 75%. General formula: (part ÷ whole) × 100.
How do I work out a discount percentage?
Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100. A $80 item on sale for $60: ((80−60)÷80)×100 = 25% off.
Decrease B by A%
Result = B × (1 − A/100)
