Discount Calculator

Calculate sale price and savings from any discount percent. Optional sales tax for an estimated checkout total — free, instant shopping math.

Reviewed / updated August 4, 2026

Full walkthrough: How to Calculate a Tip

Your inputs

USD

Sticker or list price before the discount

Discount percentage

%
25
%

Applied to the sale price for an estimated checkout total

Result

Sale price

$60.00

25% off $80.00

Original price
$80.00
You save
$20.00
Sale price
$60.00
Est. sales tax
$0.00
Est. total with tax
$60.00

A 25% sale saves $20.00 before tax. That is a strong retail markdown in many US stores.

Compare discount scenarios

OffSaleSave
20%$64.00$16.00
25%$60.00$20.00
30%$56.00$24.00

Suggested next steps

  • Add your local sales tax % to see checkout total, not just the sticker sale price.
  • If the item is final sale, factor return policy into whether the discount is worth it.
  • Pair with the Tip Calculator if you’re estimating a service total after shopping.

How the discount calculation works

A sale price is the original price minus a percentage markdown:

  1. Savings = original price × (discount% ÷ 100)
  2. Sale price = original price − savings
  3. Optional sales tax = sale price × (tax% ÷ 100)
  4. Estimated total = sale price + sales tax

Presets (10%, 15%, 20%, 25%, 30%, 50%) and a 0–90% slider update results instantly. A pie chart contrasts what you pay versus what you save, and a small scenario table compares common retail markdowns side by side.

Rule-based tips describe whether the discount is modest or deep and remind you to confirm tax and return rules.

Worked example

Original price $80, discount 25%, sales tax 0%:

  1. Savings = 80 × 0.25 = $20.00
  2. Sale price = 80 − 20 = $60.00

If sales tax were 8% on the sale price:

  1. Tax = 60 × 0.08 = $4.80
  2. Estimated total = 60 + 4.80 = $64.80

At 30% off the same $80 item, savings rise to $24 and the sale price falls to $56 before tax.

Methodology and notes

All math runs in your browser in USD formatting. Stacking coupons, BOGO deals, and membership pricing can change the effective discount in ways a single percentage cannot capture — use the result as a clear baseline, then adjust for store-specific rules.

Frequently asked questions

How do you calculate a discount percentage?

Multiply the original price by the discount percent (divided by 100) to get the dollar savings. Subtract that savings from the original price for the sale price. Example: 25% off $80 saves $20 and leaves a $60 sale price.

Is sales tax calculated before or after the discount?

This calculator applies optional sales tax to the discounted sale price, which matches how many US retail registers work. A few jurisdictions or promotions may tax the pre-discount amount — check your receipt if the numbers differ.

Can I compare different discount percentages?

Yes. Use the preset buttons, the custom slider, and the 20% / 25% / 30% scenario table to see how sale price and savings change before you buy.

Does this work for “$20 off” coupons as well as percentages?

This page is built for percentage discounts. For a flat dollar coupon, subtract the coupon from the original price yourself, or convert it to a percent (coupon ÷ original price × 100) and enter that percent here.

Related tools

Related calculators — live tools and upcoming pages for internal linking.