Discount calculator
Find the sale price and exactly how much you save on any percent-off deal.
Final price
How to calculate a discount
A percent-off discount reduces the price by that share of the original. Multiply the price by the discount percentage to find your savings, then subtract it to get the sale price. If sales tax applies, it's charged on the discounted price, not the original.
The formula
sale price = price − savings
final = sale price × (1 + tax ÷ 100)
Worked example
An $80 jacket at 25% off: savings = 80 × 0.25 = $20, so the sale price is $60. With 8% sales tax, the final total is 60 × 1.08 = $64.80.
Frequently asked questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage divided by 100 to get your savings, then subtract that from the price to get the sale price.
How do I calculate the final price after a discount?
Subtract the discount from the original price. If tax applies, multiply the discounted price by 1 plus the tax rate, since tax is charged after the discount.
Is sales tax applied before or after the discount?
After. Stores apply the discount first and charge tax on the lower, discounted price.
How do I stack two discounts?
Apply them one after another, not by adding the percentages. 20% off then 10% off is 0.8 × 0.9 = 0.72, so 28% off overall, not 30%.
Financial disclaimer: This calculator is for general information and education only and is not financial advice. Estimates are based on the figures you enter and standard formulas. See our full disclaimer and confirm important decisions with a qualified professional.