Discount Calculator
Shopping a sale? This discount calculator shows the final price after a percentage off and exactly how much you save. It can also help with stacked discounts and adding sales tax, so you know what you will really pay at checkout.
How to Use the Discount Calculator
- Enter the original price.
- Enter the discount percentage, for example 25 for 25% off.
- Add a second discount or a sales tax rate if the calculator offers those fields.
- See the sale price and the amount saved.
The Discount Formula
- Amount saved = original price × discount % ÷ 100
- Sale price = original price − amount saved
- Shortcut: sale price = original price × (1 − discount ÷ 100)
Example: a jacket costs 120 with 30% off. You save 120 × 0.30 = 36, so the sale price is 84.
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How Double Discounts Work
When a store offers "20% off plus an extra 10%", the discounts are almost always applied one after the other, not added together. Starting with 100, 20% off gives 80. Then 10% off 80 gives 72. The total saving is 28%, not 30%. The order of the two discounts does not change the final price, but adding them together will overstate your savings.
Adding Sales Tax
In many places, sales tax is added after the discount. Take the sale price and multiply by 1 plus the tax rate. If the sale price is 84 and tax is 8%, the total is 84 × 1.08 = 90.72. Tax rules vary by country, state and product type, so check the rate that applies where you shop.
Finding the Original Price
If you only know the sale price and the discount, divide the sale price by (1 − discount ÷ 100). A sale price of 60 after 25% off means the original was 60 ÷ 0.75 = 80. This is handy for checking whether a deal is as good as it looks.
Smart Shopping Tips
- Compare the final price, not just the percentage, between stores.
- Watch for shipping costs that can cancel out a discount.
- Check whether coupons can be combined and in what order they apply.
- Use the percentage calculator to compare price changes over time.
Need to total several items in your basket? The basic calculator is a quick way to add them up.
Frequently Asked Questions
How do I calculate a discount percentage?
Subtract the sale price from the original price, divide by the original price and multiply by 100. For example, an item reduced from 50 to 40 has a discount of (50 − 40) ÷ 50 × 100 = 20%. This lets you compare deals presented in different ways.
How do I find the original price before a discount?
Divide the sale price by 1 minus the discount as a decimal. For example, if an item costs 45 after 10% off, the original price is 45 ÷ 0.90 = 50. This helps you confirm that the advertised saving is genuine.
How do double (stacked) discounts work, e.g. 20% + 10%?
Stacked discounts are applied one after another. From 100, 20% off gives 80, then 10% off 80 gives 72. The combined discount is 28%, not 30%. Multiply the remaining fractions, 0.80 × 0.90 = 0.72, to get the final price quickly.
How do I calculate sale price with sales tax?
First apply the discount to get the sale price, then multiply by 1 plus the tax rate. For a sale price of 75 with 7% tax, the total is 75 × 1.07 = 80.25. Tax rates depend on your location and the type of product.
How much do I save with a 30% discount?
Multiply the original price by 0.30 to find your savings, and by 0.70 to find the sale price. For example, on a 200 item you save 60 and pay 140. The calculator does this instantly for any price.