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Discount Calculator

Use this discount calculator to turn a percent-off sale into the amount saved, the sale price, and an optional checkout total using a sales-tax rate.

Important: Estimates only. Store policies, excluded items, fees, and local tax rules can change the final checkout total.
Inputs

Adjust your numbers

Results update as you type.

Enter the regular price before the discount is applied.
Use the advertised percent off, such as 20 for 20% off.
Optional. Enter the sales-tax rate as a percent. We apply it to the discounted sale price to estimate checkout total.

Assumptions

  • Discount is calculated as a percentage of the original price
  • Optional tax is applied after the discount
  • Does not model coupons, rebates, shipping, or stacked promotion rules
Results

Live answer

You save —
Sale price —
After-tax total —
How it works

Assumptions and detail

Keeps the simple percent-off math visible while adding an optional after-tax checkout estimate.

When to use this calculator

Use it when comparing sale tags, online carts, or limited-time offers where you know the original price, advertised discount percentage, and optionally your sales-tax rate.

How the discount is calculated

The calculator multiplies the original price by the discount percentage to find the amount saved, then subtracts that savings from the original price to get the sale price.

How the sales-tax rate works

The tax field is a rate, not a dollar amount. If you enter 8, the calculator estimates 8% sales tax on the discounted sale price and adds that tax amount to the checkout total. Leave it at zero when you only need the sale price.

What this does not include

The estimate does not include shipping, handling fees, rebates, loyalty rewards, or store-specific rules for stacking multiple discounts.

Assumptions

What we assume

  • The discount is a single percent off the original price.
  • Optional sales tax is estimated by applying the entered tax rate to the discounted sale price.
  • Shipping, store fees, rebates, and stacked coupon rules are not included.
Limitations

What this skips

  • Retailers may exclude products from a promotion or apply discounts in a different order.
  • Sales tax can vary by location and product type.
  • This calculator is a shopping estimate, not a guarantee of final checkout price.
Common mistakes

What people miss

  • Entering the discount as 0.2 instead of 20 for 20% off.
  • Entering a sales-tax dollar amount instead of a tax rate percentage.
  • Forgetting that shipping, fees, coupons, or excluded-item rules can change the final checkout total.

Frequently asked questions

How do I calculate 20% off a price?
Multiply the original price by 20%, then subtract that amount from the original price. For a $100 item, 20% off saves $20 and leaves an $80 sale price.
Is the tax field a percent or a dollar amount?
It is a percentage rate. Enter 8 for an 8% sales-tax rate, and the calculator applies that rate to the discounted sale price.
Can I use this for coupons or stacked discounts?
Use it for a single percent-off discount. Stacked coupons, rebates, and store-specific promotion rules may need a more detailed calculation.

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