Discount CalculatorSale price, savings, discount % & original price
A discount calculator shows the sale price and savings after a percentage or dollar discount. Formula: Sale price = Price × (1 − Discount %). Example: 30% off $65 is $65 × 0.70 = $45.50, a saving of $19.50.
- 4 calculation modes
- Live discount table
- Quantity & tax
- No sign-up
By Manzoor Ahmad · 13+ years of web development & SEO · Updated October 25, 2026Calculate a discount
Enter a price and a percentage discount.
Every discount on $65.00
| % off | You pay | You save |
|---|
What Is a Discount Calculator?
A discount calculator finds the sale price of an item after a percentage or dollar discount, and how much money you save. The core formula is Sale price = Original price × (1 − Discount %). This calculator also works in reverse: it finds the discount percentage from two prices, or the original price from a sale price, and can add quantity and sales tax.
How to Calculate a Discount: 4 Formulas
Write the percentage as a decimal first: 30% = 0.30. Every mode in the calculator uses one of these.
1 · Sale price from % off
Sale price = Price × (1 − d)$65 at 30% off: 65 × 0.70 = $45.50. You save $19.50.
2 · Sale price from $ off
Sale price = Price − Dollars off$65 with $15 off = $50.00, an effective 23.1% discount.
3 · Discount % from two prices
d = (Original − Sale) ÷ Original × 100$65 down to $45.50: 19.50 ÷ 65 = 30% off.
4 · Original price from sale price
Original = Sale price ÷ (1 − d)$45.50 after 30% off: 45.50 ÷ 0.70 = $65.00.
Worked Example: 30% Off $65
- Convert the percentage. 30% ÷ 100 = 0.30.
- Find the savings. $65 × 0.30 = $19.50 off.
- Subtract. $65 − $19.50 = $45.50 sale price.
- Or do it in one step. Multiply by what you still pay: $65 × 0.70 = $45.50.
- Mental-math check. 10% of $65 is $6.50, so 30% is 3 × $6.50 = $19.50.
Discount Chart: Sale Prices for Common Prices
Find your price on the left and the discount across the top. For any other price, use the live table inside the calculator.
| Price | 10% off | 20% off | 25% off | 30% off | 40% off | 50% off |
|---|---|---|---|---|---|---|
| $20 | $18 | $16 | $15 | $14 | $12 | $10 |
| $50 | $45 | $40 | $37.50 | $35 | $30 | $25 |
| $100 | $90 | $80 | $75 | $70 | $60 | $50 |
| $250 | $225 | $200 | $187.50 | $175 | $150 | $125 |
| $500 | $450 | $400 | $375 | $350 | $300 | $250 |
| $1,000 | $900 | $800 | $750 | $700 | $600 | $500 |
Percent Off vs Dollar Off: Which Coupon Is Better?
When a store offers a choice like “$10 off or 20% off”, there is always a break-even price. Below it the dollar coupon wins; above it the percentage wins. The break-even is simply Dollars off ÷ Percent.
| Coupon choice | Break-even price | $ off is better | % off is better |
|---|---|---|---|
| $5 off vs 10% off | $50 | Under $50 | Over $50 |
| $10 off vs 20% off | $50 | Under $50 | Over $50 |
| $10 off vs 15% off | $66.67 | Under $66.67 | Over $66.67 |
| $15 off vs 20% off | $75 | Under $75 | Over $75 |
| $20 off vs 25% off | $80 | Under $80 | Over $80 |
| $25 off vs 20% off | $125 | Under $125 | Over $125 |
| $50 off vs 20% off | $250 | Under $250 | Over $250 |
| $100 off vs 15% off | $666.67 | Under $666.67 | Over $666.67 |
Example: with “$10 off or 20% off”, a $40 basket saves more with $10 off, while a $80 basket saves $16 with 20% off.
Common Discount Mistakes
Adding stacked discounts
20% off then 10% off is 28%, not 30%. Use the Double Discount Calculator for stacked offers.
Reversing a discount wrongly
Adding 30% back to $45.50 gives $59.15, not $65. Divide by 0.70 instead, or use the Original Price Calculator.
Forgetting tax
Sales tax is charged on the sale price. The Discount and Tax Calculator shows the register total.
Treating BOGO as 50% off
“Buy one get one 50% off” is 25% off both items. Check it with the BOGO Calculator.
Ignoring the unit price
A discounted small pack can still cost more per ounce than a full-price large one. Compare with the Unit Price Calculator.
Trusting inflated “was” prices
The FTC’s pricing guides warn against fictitious former prices. A big percentage off an inflated price is not a big saving.
Related Shopping Calculators
Each of these answers the next question shoppers usually ask after this one.
Percent Off Calculator
Quick sale-rack answers with a percent-off chart for the most common markdowns.
Double Discount Calculator
When a coupon stacks on a sale, see the true combined discount instead of adding percentages.
Original Price Calculator
Reverse any sale price to the list price and test whether the “was” price is credible.
Discount and Tax Calculator
Get the exact register total once sales tax is added to the discounted price.
Black Friday Calculator
Total a whole holiday cart with a different discount on every item and track your budget.
All Shopping Calculators
Browse all 14 shopping tools for discounts, sales tax, unit prices and payment plans in one place.
Discount Calculator FAQs
Multiply the original price by the discount as a decimal to get the savings, then subtract it from the price. For 30% off $65: 65 × 0.30 = $19.50 saved, so the sale price is $45.50.
Sale price = Original price × (1 − Discount ÷ 100). For 25% off $80, that is 80 × 0.75 = $60.
Subtract the sale price from the original, divide by the original and multiply by 100. A $80 item reduced to $60 is (80 − 60) ÷ 80 × 100 = 25% off.
Multiply the price by 0.80. For $45, that is $36.00, a saving of $9.00. The Percent Off Calculator has a quick chart for every common percentage.
Divide the sale price by (1 − discount). $45.50 after 30% off was 45.50 ÷ 0.70 = $65. The Original Price Calculator does this and checks whether a “was” price is believable.
It depends on the price. The two are equal at $10 ÷ 0.20 = $50. Below $50, $10 off saves more; above $50, 20% off saves more.
No. A second discount applies to the already-reduced price, so 20% then 10% equals 28% off, not 30%. Use the Double Discount Calculator for stacked offers.
For store discounts, US sales tax is normally charged on the reduced price. Many states tax manufacturer coupons on the pre-coupon price. Add your rate in the calculator’s tax field.
Find 10% by moving the decimal point one place left, then multiply. 10% of $65 is $6.50, so 30% is $19.50 and 5% is $3.25.
It means the maximum discount on any item is 50%, and many items are discounted less. Check the actual percentage on the item you want.
Yes. Store owners can use the find-percentage mode to set markdowns, and the original-price mode to work back from a target sale price. Remember a discount reduces your margin by the full discount amount.
Yes. It is free, needs no sign-up and runs entirely in your browser.
Manzoor Ahmad
Founder of DexoCalc · 13+ years of web development & SEO experience
Manzoor designed this discount calculator as the main tool of the DexoCalc shopping cluster. Every mode is tested against hand-worked examples, and the percent-versus-dollar break-even table is calculated directly from the same formulas shown on this page.
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Last reviewed and updated: October 25, 2026
Sources & References
- Federal Trade Commission — Guides Against Deceptive Pricing, 16 CFR Part 233
- Tax Foundation — State and Local Sales Tax Rates
- Federal Trade Commission — Consumer Advice: Shopping and Saving
Disclaimer: results are estimates for planning and comparison. Store policies, coupon terms and local tax rules vary, so your receipt may differ. This calculator is not financial, legal or tax advice.