% Percentage calculator
Work out a percentage of a number, what percent one number is of another, percentage increase or decrease, and discounts.
What is X% of Y?
12
X is what percent of Y?
15%
Percentage change from X to Y
20%
Price after a discount
75
Price before a discount
100
Questions and answers
Frequently asked questions
How do I calculate 15% of 80?
Multiply 80 by 15 and divide by 100: 12. In the first box type 15 and 80.
How do I work out a percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100. From 50 to 60 is a 20% increase.
How do I find the price before a discount?
Divide the sale price by (1 − discount/100). A $75 item at 25% off was $100 before the sale.
Explore more: tip calculator, and VAT calculator.