Discount Calculator

What is a discount calculator?

A discount calculator shows how much an item costs after a percentage is taken off its original price. It can also account for an extra discount and sales tax, so you can estimate what you will pay at checkout.

A percent off calculator applies each discount to the price left after the previous discount. The sale price formula is: price x (1 - discount) x (1 - extra discount). That means an extra discount is not simply added to the first discount; it is applied to the already reduced price.

Why a sale price calculator matters

A marked-down price can look appealing, but the amount you save and the total you pay are what matter to your budget. Check the final price before you commit, especially when a store offers an extra discount or tax will be added.

If you run a business, use the same calculation before advertising a promotion. A lower selling price may help attract buyers, but it also reduces the money left to cover product costs and other expenses. Compare the planned sale price with your costs before setting the offer.

How to use this discount calculator

1. Enter the item's original price before any discounts.
2. Enter the main discount as a percentage off.
3. Enter an extra discount if another offer applies. Leave it at zero if there is no additional discount.
4. Enter the sales tax rate if you want to estimate the price with tax. Leave it at zero if you do not want tax included.
5. Review the sale price, savings, and total with sales tax. Check that the discount and tax entries match the offer and location you have in mind.

Discount calculator example

How to read your discount results

Sale price is the amount after the discounts and before tax. Savings is the difference between the original price and sale price. The savings percentage tells you how much of the original price you keep in your pocket rather than spend.

With sales tax is an estimate based on the rate you enter. Your actual checkout total can differ if the item is not taxable, the rate is different, or other charges apply. For a business promotion, confirm the sales-tax treatment with a qualified tax professional.

How to make better use of discounts

1. 01

   Compare final prices

   Check the sale price, not just the advertised percentage. When comparing offers, include any extra discount and estimated tax so you can see which option costs less.

2. 02

   Check whether offers combine

   Ask the seller whether an extra discount applies to the reduced price and whether any exclusions apply. Enter only discounts that can actually be used together.

3. 03

   Protect your promotion margin

   If you are setting prices for a business, compare the discounted price with product costs and other selling expenses. Consider changing the promotion, limiting eligible items, or renegotiating supplier terms if the price leaves too little to cover costs.

Common discount calculator mistakes

• Adding discount percentages together

  An extra discount is applied to the remaining price, not the original price. The calculator follows the sequential formula, so entering the two discounts separately gives the intended calculation.

• Entering the wrong original price

  Use the price before discounts. If you enter a price that has already been reduced, the calculator will apply the discount again.

• Treating estimated tax as guaranteed

  The tax result depends on the rate and whether the purchase is taxable. Check the applicable rate and item treatment before relying on the checkout estimate.

The discount formula

Key terms

Original price

The price before any discount is applied.

Discount

A reduction in price, usually entered as a percentage of the original price.

Sale price

The price after discounts and before sales tax.

Total savings

The difference between the original price and the sale price.