§ 01 / TOOL
$29.99 at 50% off.
STATUS ACTIVEMODE % OFFLATENCY <1MS
> INPUT
MODE % OFF
$
LESS
LESS
% off
SALE PRICE.
DISCOUNTED
// RESULT
$15.00
// YOU SAVE
$15.00
// FORMULA
$29.99 − 50% = $15.00
$29.99 with 50% off is $15.00 — you save $15.00.
§ 02 / ABOUT
How discounts really work.
A discount is a percentage subtracted from the original price. Multiply the price by (1 - discount/100) to get the sale price; the difference is what you save. This calculator does both, plus a clean "YOU SAVE" card for the stakes.
// THREE THINGS TO WATCH
- "Up to 70% off" — the actual average is usually far less. Read the tags, not the signs.
- Sale price ≠ value — a 50%-off item still costs money. The real question is whether you'd pay the sale price if it weren't on sale.
- Tax is on the sale price, not the original. Run the number through Sales Tax if the shelf tag matters.
// STACKING DISCOUNTS
Two 20%-off codes don't add to 40% — they compound. $100 → 20% off → $80 → 20% off → $64. That's 36% off, not 40%. Most stores won't let you stack at all. When they do, the math always favors the store.
Related: Sales Tax, Percentage, Markup.
§ 02 / FAQ
Questions. Answered.
How do I calculate a discount?+
Multiply the original price by the discount percentage to get the savings, then subtract from the original. $80 × 30% = $24 saved, so sale price is $56. Type the original price on the left and the percent off on the right — sale price and savings appear instantly.
What does "30% off" actually mean?+
It means you pay 70% of the original price. A $80 item at 30% off costs $56. The discount percentage is always the share you save, not the share you pay.
How do stacked discounts work?+
They multiply, not add. A 20% coupon on an already-30%-off item is 0.8 × 0.7 = 0.56, i.e. 44% off total — not 50%. Be careful: "an additional 20% off the sale price" always gives less savings than a straight 50% off the original.
Can discount exceed 100%?+
No — 100% off means free. Anything higher would mean the seller pays you, which isn’t a discount. This calculator caps discount at 100%.
Does the URL update so I can share?+
Yes. As you type, the URL updates to /discount/80-30 (price-percent). Copy the URL bar or use the SHARE button to send the deal to a friend.
§ 04 / TOOLS
Related calculators.
§ 05 / READING