Discount Calculator
Calculate final price after a discount, the savings amount, or reverse-engineer the discount rate from two prices.
Final Price
$90.00
You Save
$30.00
25% off
Original
$120.00
before discount
Savings Breakdown
Common discount calculations
Worked-out pages for frequently searched sale prices, each with a reference table.
- 10% off $30 = $27
- 10% off $500 = $450
- 10% off $1,200 = $1,080
- 15% off $75 = $63.75
- 15% off $120 = $102
- 15% off $200 = $170
- 20% off $40 = $32
- 20% off $50 = $40
- 20% off $80 = $64
- 20% off $150 = $120
- 20% off $250 = $200
- 20% off $1,000 = $800
- 25% off $40 = $30
- 25% off $60 = $45
- 25% off $80 = $60
- 25% off $120 = $90
- 25% off $200 = $150
- 30% off $45 = $31.50
- 30% off $100 = $70
- 30% off $250 = $175
- 33% off $60 = $40.20
- 35% off $150 = $97.50
- 40% off $35 = $21
- 40% off $60 = $36
- 40% off $120 = $72
- 50% off $25 = $12.50
- 50% off $120 = $60
- 60% off $80 = $32
- 70% off $120 = $36
- 75% off $40 = $10
Discounts: stack rules, outlet math, and reversals
Enter a price and a percentage off to see the sale price and the saving instantly. To work backwards — the discount implied by two prices — divide the saving by the original price; the percentage calculator’s percentage-change section does this for you.
Promotions that apply in sequence (20% then $10 off) are not commutative; enter final shelf price when in doubt.
How the sale price is worked out
Enter the original price and the percentage off. The saving is price × discount ÷ 100 and the sale price is the original minus the saving — equivalently, price × (1 − discount ÷ 100). A 25% discount means you pay 75% of the price. The discount can be anything from 0 to 100%.
Worked examples
- Order of promotions: on a $100 item, “20% off, then $10 off” costs $70, but “$10 off, then 20% off” costs $72. Retailers choose the order; check the receipt.
- Discount plus sales tax: an $80 item at 25% off is $60, and with 8% sales tax you pay $64.80. Tax is charged on the discounted price, so the discount also saves you tax.
- Was / now labels: “was $129.99, now $89.99” is a $40 saving, or 30.77% off — divide the saving by the original price.
- Hitting a budget: to bring a $65 item down to $50 you need a discount of 15 ÷ 65 = 23.08%.
Stacked and multi-buy offers
- Successive percentages multiply: 20% off followed by 10% off is 1 − 0.8 × 0.9 = 28% off, not 30%.
- “Up to 70% off” describes the best item in the sale, not the typical one.
- “Buy 2, get 1 free” on equally priced items is 33.3% off each item — but only if you wanted three.
- “Spend $100, save $20” is a 20% discount only at exactly $100; spend $130 and it is 15.4%.
Is it really a deal?
A percentage is only as honest as the price it starts from. Some retailers raise a list price shortly before a sale, or compare with a “recommended retail price” the item never sold at. Price-history tools and saved screenshots help you see what an item actually cost last month. For subscriptions, compare the discounted first-year price with what you will pay from year two, when most introductory discounts end.
Markups and discounts are not mirror images
A percentage discount is always taken from the higher price, so equal percentages up and down do not cancel. Mark a $100 item up by 25% to $125, then discount it by 25%, and it sells for $93.75. To undo a 25% markup you need a 20% discount (25 ÷ 125). The same asymmetry explains why a price that fell 50% has to rise 100% to recover.
Retailers use this in both directions: “40% more free” on a pack is only a 28.6% saving per unit (1 − 1 ÷ 1.4), and a price cut from $1.00 to $0.80 is 20% off, while the move back to $1.00 is a 25% increase.
In-depth guides
- US Sales Tax Explained: State and Local Rates, Exemptions and Online Purchases
Why your sales tax rate depends on your address, which states have none, how to back tax out of a total, and what changed for online shopping in 2018.
- How Stacked Discounts Really Work: 30% + 20% Is Not 50%
Why successive discounts multiply, how coupon order changes the price, what “buy one get one” is really worth, and how to spot a discount that is not a deal.
Related tools
These free tools pair well with this page — open them in a new tab to finish your workflow.
Frequently Asked Questions
How is the discounted price calculated?
Discounted price = original price × (1 - discount% / 100). For example, a £80 item with a 25% discount: £80 × 0.75 = £60. The amount saved is £80 - £60 = £20.
How do I calculate the original price from a sale price?
If you know the final price and the discount percentage, the original price = final price / (1 - discount% / 100). For example, £60 at a 25% discount means the original was £60 / 0.75 = £80.
What is the difference between a percentage discount and a fixed amount discount?
A percentage discount scales with the item price — a 20% discount on a £200 item saves more (£40) than on a £50 item (£10). A fixed amount discount (e.g. £10 off) saves the same regardless of price.
How do I calculate a discount after tax?
It depends on the order of operations. Discount before tax: apply the discount, then add tax. Discount after tax: add tax first, then apply the discount. These give different final prices. Most retail discounts are applied before tax.
What is a stackable discount?
Stackable discounts are applied sequentially, not added together. A 20% discount followed by a 10% discount is not 30% off — it is 1 - (0.8 × 0.9) = 28% off. Always multiply the remaining fractions, not add the percentages.
What does 'buy one get one X% off' mean?
'Buy one get one 50% off' means you pay full price for one item and 50% for the second. If each item costs £10, you pay £10 + £5 = £15 for two, an effective 25% discount on the pair.
Is a 50% discount the same as half price?
Yes. A 50% discount means you pay 50% of the original price, which is exactly half price. A 100% discount would be free.