Discount Calculator — the United States
Calculate US sale prices, find the percentage off, or reverse the original price. Includes optional after-tax totals, stacked markdowns, and bulk quantity pricing.
Quick check — see the price after a percentage discount.
United States Discount Notes
US discount pricing usually starts from the pre-tax shelf price, with state and local sales tax added at checkout. That makes the after-tax checkout total more useful than trying to back a tax amount out of a tax-inclusive price.
This version is tuned to US retail math, where stacked markdowns, coupon sequencing, and after-tax totals vary by state and city.
US setup: this discount is tuned for dollar-denominated scenarios, American payroll and tax references, state-by-state cost differences, and the finance terms people see in lender, employer, or IRS-facing documents.
The page keeps US language in place where it is relevant, including IRS, federal withholding, FICA, 401(k), sales tax, miles, APR, down payment, paycheck, state tax, and USD totals.
Treat the answer as a United States estimate; before acting, compare it with provider disclosures, state rules, federal guidance, lender underwriting, payroll settings, or advice from a qualified professional.
Results update instantly. Stacked discounts multiply — not add.
In the United States there is no national sales tax. Shelf prices are shown pre-tax, and state and local sales tax is added at the register — so a discount comes off the pre-tax price first, then tax is charged on the reduced amount.
The percentage discount applies to the pre-tax ticket price, and sales tax is calculated on the discounted total. A $200 item at 25% off is $150 pre-tax; at a 7.5% combined rate the sales tax is $11.25, for a $161.25 checkout total. Lower the price and the tax falls with it.
There is no single US rate. The combined state, county and city rate averages about 7.5% and ranges from 0% (Delaware, Montana, New Hampshire, Oregon) to roughly 10% in parts of Louisiana and Tennessee (Tax Foundation, 2025). Enter your local rate in Standard mode for an accurate checkout total.
Many states exempt groceries, prescription drugs and some clothing from sales tax. If the item is exempt, choose “pre-tax price only” in the sales-tax field — the discount math is unchanged and no tax line is shown.
Stacked discounts multiply, not add. “30% off then extra 15% off” does not equal 45% off.
Two discounts applied sequentially: (1 − 30%) × (1 − 15%) = 0.70 × 0.85 = 0.595. You pay 59.5% of the original price. Effective discount = 40.5%, not 45%. The second discount is applied to the already-reduced price, not the original.
“Extra 15% off all sale items” sounds generous but the 15% is applied to the already-reduced price. On a $500 item at 30% off ($350), the extra 15% saves $52.50 — not $75. Use Detailed mode to model any combination of stacked discounts.
Mathematically, the order of applying two discounts makes no difference to the final price. 30% then 15% = 15% then 30% = 40.5% effective discount either way. Where order does matter: if a fixed dollar discount is applied (e.g. $20 off after % discount), apply the % first.
US pricing ads are governed by the FTC’s Guides Against Deceptive Pricing (16 CFR Part 233), plus state consumer-protection laws.
The “was” price in a “was $X, now $Y” tag must be a bona fide former price — one the item was openly offered at for a reasonably substantial period. Retailers may not inflate a reference price to make a discount look bigger. Report suspected fake “was” prices to the FTC or your state attorney general.
If a store advertises “up to 70% off”, only one item has to hit 70% — most can be discounted far less. The FTC treats a price claim as deceptive if the most prominent number misleads a typical shopper about the actual savings available.
If an item rings up higher than the shelf or advertised price, ask the store to honor the lower price — most major chains have a scanner-accuracy policy. Keep your receipt so you can request a refund of the difference, and check your state’s consumer-protection rules.
Three discount formulas — sale price, discount %, and original price
| Calculation | Formula & example |
|---|---|
| Sale price | Original × (1 − Discount%) → $200 × 0.75 = $150 (25% off) |
| Discount % | (Original − Sale) / Original × 100 → ($350 − $280) / $350 × 100 = 20% |
| Original price | Sale / (1 − Discount%) → $180 / 0.75 = $240 (was 25% off) |
Quick mental discount calculations for common percentages
| Discount | Mental shortcut |
|---|---|
| 10% off | Move decimal left one place → $250 × 10% = $25 saving → $225 |
| 20% off | Divide by 5, subtract → $300 ÷ 5 = $60 saving → $240 |
| 25% off | Divide by 4, subtract → $200 ÷ 4 = $50 saving → $150 |
| 50% off | Simply halve the price → $180 ÷ 2 = $90 |
| 30% off | 10% × 3, subtract → $200 × 10% = $20 × 3 = $60 off → $140 |
| 15% off | 10% + half of 10% → $200: 10% = $20, half = $10; total = $30 off → $170 |
How sales tax interacts with discounts on US retail prices
Discounts come off the pre-tax price, then tax is added
There is no national sales tax in the United States. Shelf prices are quoted pre-tax, and state and local sales tax is added at checkout. So a percentage discount is applied to the pre-tax price, and sales tax is charged on the reduced amount — the table below uses a 7.5% combined rate (the US average per the Tax Foundation, 2025).
| Price point | Checkout at 7.5% sales tax |
|---|---|
| $200.00 pre-tax | Tax = $15.00 · Total = $215.00 |
| $150.00 sale (25% off) | Tax = $11.25 · Total = $161.25 |
| $100.00 sale (50% off) | Tax = $7.50 · Total = $107.50 |
Your rate depends on location: it ranges from 0% in Delaware, Montana, New Hampshire and Oregon to about 10% in parts of Louisiana and Tennessee. Enter your combined state + local rate in Standard mode for an exact after-tax total.
How stacked discounts work — and why 30% + 15% ≠ 45%
When two discounts are applied sequentially, they multiply — not add. The second discount applies to the already-reduced price, not the original. This means the combined effective discount is always less than the sum of the two rates.
| Discount combination | Effective combined rate |
|---|---|
| 20% + 10% | 28% effective → (1-0.20) × (1-0.10) = 0.72 → 28% off |
| 30% + 15% | 40.5% effective → (1-0.30) × (1-0.15) = 0.595 → 40.5% off |
| 50% + 20% | 60% effective → (1-0.50) × (1-0.20) = 0.40 → 60% off |
Frequently askedFrequently asked questions
How do I calculate a discount percentage?
Discount % = (Original price − Sale price) / Original price × 100. Example: original $200, sale $150. Discount = $50 / $200 × 100 = 25%. Use the “Find discount %” mode in this calculator to do this automatically.
Do stacked discounts add up?
No. Stacked discounts multiply, not add. “30% off then extra 15% off” does not equal 45% off. The effective combined discount is (1 − 0.30) × (1 − 0.15) − 1 = 40.5%. The second discount is applied to the already-reduced price.
Does sales tax apply to discounted prices in the United States?
Yes, but it is added after the discount. US shelf prices are pre-tax, so the percentage discount comes off the pre-tax price and sales tax is then charged on the reduced amount at your combined state and local rate (about 7.5% on average, but 0% in a few states). Use Standard mode to add an estimated sales-tax line to any discounted price.
Can I find the original price if I only know the sale price?
Yes. Original price = Sale price / (1 − Discount%). Example: paid $180 after 25% off. Original = $180 / 0.75 = $240. Use the “Find original price” mode in this calculator.
What are the rules on discount advertising in the United States?
Under the FTC’s Guides Against Deceptive Pricing (16 CFR Part 233), a “was” price must be a bona fide former price the item was openly offered at for a reasonably substantial period — retailers cannot inflate a reference price to fake a bigger discount. Report misleading discount advertising to the Federal Trade Commission (reportfraud.ftc.gov) or your state attorney general.