Percent Off Calculator
30% off $79.99 is $55.99: multiply the price by 0.70. Add more discounts below — each comes off the new price — then your sales tax, and see what you really pay.
Deals and working backwards
What was the price before the sale?
Original$80.00
What percent off is that?
Discount25% off
Buy some, get some off — what is each worth?
Off each item25%
At $79.99 each: 2 cost $119.98
Sale price
$50.39
- You save
- $29.60
- Total discount
- 37%
- Was
- $79.99
Discounts stack: each one comes off the price left by the one before, rounded to the cent as at a register. Tax is worked out on the discounted price.
How it’s calculated
- Discount 1$79.99 × (1 − 30%) = $55.99
- Discount 2$55.99 × (1 − 10%) = $50.39
- Total discount1 − $50.39 ÷ $79.99 = 37%
| Off | You pay | You save |
|---|---|---|
| 10% | $71.99 | $8.00 |
| 15% | $67.99 | $12.00 |
| 20% | $63.99 | $16.00 |
| 25% | $59.99 | $20.00 |
| 30% | $55.99 | $24.00 |
| 40% | $47.99 | $32.00 |
| 50% | $39.99 | $40.00 |
| 60% | $32.00 | $47.99 |
| 70% | $24.00 | $55.99 |
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How to calculate percent off
sale price = original price × (1 − percent off ÷ 100)
you save = original price − sale price
Example. A jacket is $79.99 with 30% off: 79.99 × 0.70 = $55.99, a saving of $24.00.
A quick way in your head: take 10% by moving the decimal point one place left ($8.00), multiply to the discount you need (30% = $24.00) and subtract from the price. Some discounts are easier as fractions — 25% off is a quarter off, 50% is half, 33⅓% is a third — and the fraction calculator works with those directly.
Stacked discounts: “an extra 20% off sale prices”
When a store takes an extra discount off a price that is already reduced, the discounts multiply, they do not add:
| Discounts | On $100 | Total discount |
|---|---|---|
| 20% | $80.00 | 20% |
| 20% + extra 15% | $68.00 | 32% |
| 30% + extra 10% | $63.00 | 37% |
| 40% + extra 20% | $48.00 | 52% |
| 50% + extra 50% | $25.00 | 75% |
The rule: the combined discount is 1 − (1 − d₁) × (1 − d₂) × … For 40% and 20%: 1 − 0.60 × 0.80 = 0.52, so 52%. Add up to five discounts in the calculator, in the order the store applies them, and it shows the single percentage they add up to.
Dollar coupons and the order of discounts
Percentage discounts can come in any order — multiplication gives the same answer either way. A dollar coupon is different, because it takes the same amount off whatever price it meets:
- $100, then 20% off ($80), then $10 off → $70
- $100, then $10 off ($90), then 20% off → $72
Switch any discount between % off and $ off, and add them in the order shown on your receipt. The calculator also never lets a dollar coupon push the price below zero.
“Buy one, get one 50% off” and other multi-buy deals
A multi-buy deal spreads its discount over everything you buy. Buy one at full price and get the second at 50% off, and you pay 150% of the price for 200% worth — 25% off each item, not 50%.
discount per item = items at a discount × percent off ÷ total items
| Deal | Off each item |
|---|---|
| Buy 1, get 1 50% off | 25% |
| Buy 1, get 1 free | 50% |
| Buy 2, get 1 free | 33.3% |
| Buy 2, get 1 50% off | 16.7% |
| Buy 3, get 1 free | 25% |
So “buy one, get one 50% off” beats a 20% sale only if you wanted two. The Buy some, get some off box under the calculator works out any deal; enter 100% for “free”.
Adding sales tax
Enter your combined state and local rate under Sales tax. The calculator works the tax out on the discounted price, rounded to the cent like a register:
Example. $79.99 with 30% and an extra 10% off is $50.39. At 7.25% sales tax: 50.39 × 0.0725 = $3.65, so you pay $54.04.
How coupons are taxed is set by each state, and some coupons (such as manufacturer coupons) can be treated differently from a store’s own discount. If the exact tax matters, check your state revenue department’s guidance.
Sale prices at a glance
| Price | 10% off | 15% off | 20% off | 25% off | 30% off | 40% off | 50% off |
|---|---|---|---|---|---|---|---|
| $20 | $18.00 | $17.00 | $16.00 | $15.00 | $14.00 | $12.00 | $10.00 |
| $25 | $22.50 | $21.25 | $20.00 | $18.75 | $17.50 | $15.00 | $12.50 |
| $40 | $36.00 | $34.00 | $32.00 | $30.00 | $28.00 | $24.00 | $20.00 |
| $50 | $45.00 | $42.50 | $40.00 | $37.50 | $35.00 | $30.00 | $25.00 |
| $75 | $67.50 | $63.75 | $60.00 | $56.25 | $52.50 | $45.00 | $37.50 |
| $100 | $90.00 | $85.00 | $80.00 | $75.00 | $70.00 | $60.00 | $50.00 |
| $150 | $135.00 | $127.50 | $120.00 | $112.50 | $105.00 | $90.00 | $75.00 |
| $200 | $180.00 | $170.00 | $160.00 | $150.00 | $140.00 | $120.00 | $100.00 |
The table next to the calculator does the same for whatever price you type.
Working backwards from a sale price
original price = sale price ÷ (1 − percent off ÷ 100)
A $60 item marked “25% off” was 60 ÷ 0.75 = $80. And if a tag says “was $80, now $60”, the real discount is 1 − 60 ÷ 80 = 25%. A common mistake is to add 25% back to $60, which gives $75 — the base is different, as with any percentage change.
For a restaurant bill instead of a price tag, the tip calculator works the percentage the other way — onto the total — and splits it between people.
More everyday money and number tools are collected under Math calculators.