Percentage & Discount Calculator
Quick answers for everyday percentage questions, and a discount calculator for sale prices, extra offers and GST.
Percentage calculator
Type in the boxes. Answers update instantly.
1. What is X% of a number?
Answer
2. This number is what % of another?
Answer
3. Percentage increase or decrease
Change
4. Add a percentage to a number
New number
5. Subtract a percentage from a number
New number
Discount calculator
Price after discount
You pay
Find the original price from the sale price
You know the sale price and the discount. What was the price before the discount?
Original price
Useful formulas
- X% of Y = Y × X ÷ 100
- Percentage change = (new − old) ÷ old × 100
- Discounted price = price × (1 − discount ÷ 100)
- Two discounts do not add up: 20% then 10% is 28% in total, not 30%, because the second applies to the reduced price.
Selling to customers? Add the discount to your quotation, check the profit margin and add tax with the GST calculator. New to this? Read how to calculate percentage.