Calculate discount amount and final price quickly with an easy online discount calculator in your browser.
25 for 25% off). The calculator instantly returns the Savings (Original Price x Discount / 100) and the Final Price (Original Price - Savings). A 25% discount on $79.99 saves $20.00 and lands at $59.99.1 - (0.70 x 0.80) = 44% off, not 50%. The calculator chains each percentage on the running total so you see the true combined discount.Percent-off math is easy in isolation but gets slippery the moment a second discount, a sales tax, or a "free with $50" threshold enters the picture. Retailers know this, and the FTC's Guides Against Deceptive Pricing (16 CFR Part 233) explicitly call out fictitious "was/now" prices designed to make the markdown look bigger than it is. A calculator lets you sanity-check the deal in seconds and decide whether you actually need the second coupon. Typical scenarios:
1 - (0.40 x 0.80) = 68% off — still good, but verify it isn't worse than the same item's typical price (Notre Dame research on "true normal price" found that disclosing the actual most-frequently-charged price largely eliminates the persuasive effect of inflated "regular price" tags).Need related math? Add tax with the Sales Tax Calculator, check raw percentage moves with the Percentage Calculator, or use the Tip Calculator when you're splitting a meal that's already been discounted.
The single most common discount-math mistake: assuming "30% off plus 20% off" equals 50% off. It does not. Percentage discounts compound multiplicatively because the second discount applies to the already-reduced price, not to the original.
| First discount | Second discount | If you add (wrong) | If you multiply (right) | Final price on $100 |
|---|---|---|---|---|
| 10% | 10% | 20% off | 19% off | $81.00 |
| 20% | 10% | 30% off | 28% off | $72.00 |
| 30% | 20% | 50% off | 44% off | $56.00 |
| 40% | 20% | 60% off | 52% off | $48.00 |
| 50% | 20% | 70% off | 60% off | $40.00 |
| 50% | 50% | 100% off (free!) | 75% off | $25.00 |
| 60% | 30% | 90% off | 72% off | $28.00 |
| 70% | 25% | 95% off | 77.5% off | $22.50 |
Formula for two stacked percentage discounts: Combined = 1 - (1 - d1) x (1 - d2). For three or more, keep multiplying the remaining fractions. Two 50%-off discounts never make anything free — they make it 75% off. This is why retailers can advertise "stackable" coupons without going bankrupt.
Multiply mentally: 10% off is one decimal shift, 50% off is half. For 25% off, take a quarter off (divide by 4 and subtract). For 33% off, divide by 3 and subtract.
| Original | 10% off | 15% off | 20% off | 25% off | 30% off | 40% off | 50% off | 70% off |
|---|---|---|---|---|---|---|---|---|
| $20 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $12.00 | $10.00 | $6.00 |
| $50 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $30.00 | $25.00 | $15.00 |
| $75 | $67.50 | $63.75 | $60.00 | $56.25 | $52.50 | $45.00 | $37.50 | $22.50 |
| $100 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $60.00 | $50.00 | $30.00 |
| $150 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $90.00 | $75.00 | $45.00 |
| $200 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $120.00 | $100.00 | $60.00 |
| $500 | $450.00 | $425.00 | $400.00 | $375.00 | $350.00 | $300.00 | $250.00 | $150.00 |
| $1,000 | $900.00 | $850.00 | $800.00 | $750.00 | $700.00 | $600.00 | $500.00 | $300.00 |
They multiply. A 30% sale plus an additional 20%-off coupon is 1 - (0.70 x 0.80) = 44% off, not 50%. This is the single most exploited fact in retail signage — "EXTRA 20% OFF ALREADY-REDUCED PRICES" sounds like a giveaway because most shoppers add the percentages in their head. The math compounds because the second discount is computed on the already-reduced price, not on the original sticker. The order doesn't matter for percentage-only stacking (0.7 x 0.8 = 0.8 x 0.7), but it absolutely matters when one of the offers is a flat dollar amount.
It depends on the retailer's stated terms. For two percentage discounts the order is mathematically irrelevant because multiplication is commutative. For a percentage plus a flat dollar coupon, the order materially changes what you pay: applying the percentage first and the dollar coupon last usually saves you more on big-ticket items, while dollar-first then percentage saves more on small items. Most US retailers (Kohl's, Macy's, Bed Bath stack policy historically) apply the sale price first, then the coupon because it benefits them, not you. Read the fine print on the coupon or POS terms — they will spell out the order.
Gross discount is the headline percentage off the original price ("50% off"). Net discount is what you actually save after stacking restrictions, exclusions, tax, and any minimum-purchase boost or membership fee subtracted. A "50% off" Costco membership "deal" with a $60 annual fee is a net 0% if you only buy one $120 item that year. Net discount is the only number that matters for budgeting; gross discount is the marketing.
A true "buy one, get one free" is 50% off — but only on the condition that you need (or want) both items. If you'd only have bought one, the effective discount is zero and you've just paid full price for two items. "Buy 2 get 1 free" is 33.3% off (one free out of three). "Buy 3 get 1 free" is 25% off. The trap is BOGO on items you don't need at the second-item price — the per-unit effective discount can be 0–50% depending on your real demand.
Because the MSRP (Manufacturer's Suggested Retail Price) is often a number the manufacturer prints on the box for marketing leverage, not the price the item actually sold for. The FTC's Guides Against Deceptive Pricing require that any advertised "former price" be a bona fide price at which the item was sold for a "reasonably substantial period." In practice, enforcement is uneven and "always-on-sale" pricing is the norm at outlet malls and big-box clearance racks. Use the calculator's reverse-pricing function or check the typical price on a tracker like CamelCamelCamel before crediting the markdown.
Sometimes; varies by retailer. As of 2026, common policies: Apple's education store (~10% off Mac/iPad for verified students) does not stack with promotional sales — you get whichever is larger. Lowe's military discount (10%) generally does not stack with separate promotional codes but does apply to already-marked-down clearance. Kohl's is known for permissive stacking — sale price + percent-off coupon + Kohl's Cash from a prior purchase + senior discount day. Always verify at checkout, and try the codes in different orders — sometimes only one combination is honored.
Both, depending on what you measure. The percentage-point difference is +1 pp (5 - 4). The percent difference is +25% (1 / 4 = 0.25). Banks, news headlines, and politicians frequently exploit the ambiguity: "rates rose 1%" sounds tiny but if it's a 1-percentage-point rise from 4% to 5%, your monthly mortgage payment on a $400k 30-year loan goes from ~$1,910 to ~$2,147 — roughly $240/month more, or $85k over the loan's life. Always ask "1 percent of what?" Use percentage points for absolute differences between rates; use percent change for relative differences. They are not interchangeable.
Divide. If a jacket is $63 after 30% off, the original was 63 / (1 - 0.30) = 63 / 0.70 = $90. The general formula: Original = Final / (1 - Discount). This is the standard "reverse-pricing" trick for spotting inflated MSRPs (compare the implied original to the typical street price) and for resale listings ("originally $200, asking $80" — verify by dividing). Enter any two of original, discount, and final into the calculator and it solves for the third.
No. All math runs in your browser as you type — there is no submit button, no account, no analytics tied to the price you enter, and nothing is uploaded or stored. Refresh the page and the values reset. Safe to use for confidential pricing work (margin checks, vendor quote analysis, customer-facing quote sheets) where the numbers shouldn't hit a third-party server.