Discount Calculator
Find the final sale price and exactly how much you save after a percentage discount — no mental maths at the checkout.
Calculator
What this discount calculator does
"50% off!" sounds simple until the sticker says 30% off an already-reduced price and you're standing in the aisle doing fractions. This discount calculator removes the guesswork: enter the original price and the discount percentage, and it shows the final price you'll pay and the exact dollar amount you save. It's the fast way to check whether a sale is as good as it looks.
Knowing the real saving in dollars — not just the percentage — helps you compare deals fairly. A 20% discount on a $200 item ($40 off) beats a 40% discount on a $90 item ($36 off), even though 40% sounds bigger. The calculator makes that comparison instant.
How to use it
- Original price — the full price before the discount.
- Discount % — the percentage off, e.g. 25.
- Calculate — read the final price and the amount you save.
The formula explained
Final price = price − saving = price × (1 − discount% ÷ 100)
A 25% discount means you pay 75% of the original price, so multiplying by 0.75 gives the final price directly. Thinking in terms of "what fraction do I still pay" (100% minus the discount) is often quicker than calculating the saving and subtracting it.
Worked examples
Final price after a discount
| Discount | $50 item | $100 item | $250 item |
|---|---|---|---|
| 10% | $45.00 | $90.00 | $225.00 |
| 20% | $40.00 | $80.00 | $200.00 |
| 25% | $37.50 | $75.00 | $187.50 |
| 30% | $35.00 | $70.00 | $175.00 |
| 50% | $25.00 | $50.00 | $125.00 |
When to use it
- Sales and Black Friday — check the real price before you buy.
- Comparing offers — see which deal saves the most in actual dollars.
- Coupon stacking — work out the true total when discounts combine.
- Reselling and pricing — set markdowns and clear-out prices.
Tips and common mistakes
Discounts don't add up. 20% then 10% is 28% off, not 30% — each discount applies to the new, smaller price. Compare savings in dollars, not just percentages, when items have different prices. Check whether tax is applied before or after the discount (it's usually after, on the reduced price). And beware inflated "original" prices — some retailers raise the list price before a sale so the discount looks bigger than the real saving.
Reverse it: from sale price back to discount
Sometimes you see only the original and sale prices and want to know the percentage off. Divide the saving by the original price and multiply by 100: ((original − sale) ÷ original) × 100. For example, a coat marked down from $120 to $84 has a saving of $36, so the discount is (36 ÷ 120) × 100 = 30% off. This is handy for spotting whether an advertised "huge" discount really matches the numbers on the tag, and for comparing two sales where one shows a percentage and the other shows a price.
You can also work backwards to the original price if you only know the sale price and the discount. Because the sale price is the original multiplied by (1 − discount/100), divide the sale price by that factor to recover the original. A $75 item that is 25% off was originally 75 ÷ 0.75 = $100. Retailers and resellers use this to set or verify markdowns, and shoppers can use it to sanity-check "was/now" claims.
Discounts vs markups — a common confusion
A 50% markup followed by a 50% discount does not return to the starting price. If a $100 cost is marked up 50% to $150, then discounted 50%, you reach $75 — a quarter below the original, because the discount is taken from the higher marked-up figure. Understanding which base each percentage applies to is the single most important idea in all percentage maths, and it explains why "stacked" promotions are almost always smaller than they first appear.
Frequently asked questions
How do I calculate a discount?
Multiply the original price by the discount percentage and divide by 100 to get the saving, then subtract it from the price. Or multiply the price by (1 − discount/100) to get the final price directly.
What's the final price after 25% off $80?
You pay 75% of $80, which is 80 × 0.75 = $60. The saving is $20.
Do two discounts add together?
No. Stacked discounts apply one after another to the reduced price. 20% off then 10% off equals 100 × 0.8 × 0.9 = 72, a 28% total discount, not 30%.
Is tax calculated before or after the discount?
Usually after. Sales tax is normally applied to the discounted price, so you pay tax on the lower amount. Check your local rules, as practice can vary.
Which is the better deal: 40% off a cheap item or 20% off an expensive one?
Compare the saving in dollars, not the percentage. 20% off a $200 item saves $40, while 40% off a $90 item saves only $36, so the first deal saves more.
Why does the 'original' price sometimes look inflated?
Some retailers raise the list price shortly before a sale so the percentage off appears larger. Compare the sale price against what the item normally sells for, not just the advertised discount.