Discount & Sale Price Calculator
Calculate sale price after a discount, find the discount percentage, or reverse-engineer the original price. Free, instant, in your browser.
What is a discount calculator?
A discount calculator helps you find sale prices, savings amounts, and discount percentages without mental math – useful when comparing promotions, checking receipts, or pricing your own sales.
This tool runs entirely in your browser. Switch between three modes depending on whether you know the original price, the final price, or the discount rate.
Everyday examples
Black Friday jacket
Tag 199.99, 25% off: you pay 149.99 and save 50.00.
Receipt check
Was 80, paid 64: discount is 20%, saved 16.00.
Reverse the sticker price
Sale price 80 after 20% off means the original was 100.00.
How to use this calculator
Pick one of three modes, enter what you know, and read the breakdown instantly. No button, no account, everything runs in your browser.
Quick steps
- Choose the mode: sale price, discount %, or original price.
- Enter amounts with up to two decimal places.
- Select your display currency from the list.
- Check the summary grid and the highlighted result card.
When should you use this?
Shopping and sales
Compare shelf tags, promo codes, and outlet prices before you buy.
Invoices and receipts
Verify whether a listed discount matches what you actually paid.
Pricing your own offers
Set a sale price or work backwards from a target checkout amount.
Common mistakes
Stacking discounts wrong
Two 10% cuts are not the same as 20% off. Apply each step separately.
Tax after discount
VAT or sales tax may apply to the discounted price, not the old tag.
100% off confusion
A free item is not the same as reversing an unknown original price at 100%.
Worked scenarios
Five quick anchors that mirror the three calculator modes.
| Scenario | What you enter | Result | Real-world context |
|---|---|---|---|
| 30% off 250 | Original 250, discount 30% | Pay 175, save 75 | Seasonal sale on electronics |
| Paid 45 instead of 60 | Original 60, final 45 | Discount 25%, save 15 | Checking a clearance sticker |
| Sale 120 at 40% off | Final 120, discount 40% | Original 200, save 80 | Finding the pre-sale tag price |
| 10% loyalty code | Original 89.90, discount 10% | Pay 80.91, save 8.99 | Newsletter coupon on fashion |
| Bundle markdown | Original 149, final 119 | Discount 20.13%, save 30 | Comparing bundle vs single-item price |
Formulas
- Final price
Original × (1 − Discount% ÷ 100) - Discount %
((Original − Final) ÷ Original) × 100 - Original price
Final ÷ (1 − Discount% ÷ 100) - Amount saved
Original − Final
Key discount terms
Discount percentage
The share of the original price removed, expressed as a percent.
Sale price
What you pay after the discount is applied.
Reverse calculation
Working from the checkout price and discount rate to find the old tag.
Frequently Asked Questions
How discounts, sale prices, and reverse calculations work.
How do I calculate 20% off?
Multiply the original price by 0.80. Example: 100 × 0.80 = 80. You can also subtract 20% of 100, which is 20.
Can the final price be higher than the original?
No. That would be a markup, not a discount. The calculator shows an error in that case.
Why is 100% discount blocked?
At 100% off the item is free and reverse math divides by zero. Use up to 99.99%.
Is this financial or tax advice?
No. It is an educational estimator. Real receipts, VAT rules, and store policies can differ. Confirm anything binding with official documents or a qualified professional.
About these results
Outputs follow the formulas on this page from the numbers you enter. Rounding, local tax, or stacked promotions can change real totals. Use answers for planning, not as store or tax authority statements.