Sale price and savings
Enter a price and a percentage off to get the final figure, the money saved and the share of the original price you are actually paying.
Free · Stacked discounts · Instant
Discount Calculator — Percent Off, Sale Price & Savings
Work out the sale price and exactly how much you save, stack a second discount or coupon, add sales tax, and run it backwards to find the original price or the percentage off you were really given.
Stack two discounts
Find the original price
Sales tax included
7 currencies
Calculate the discount
Choose what you know and we’ll work out the rest. Everything runs in your browser — nothing is uploaded or stored.
Your savings will appear here
Enter a price and a discount and we’ll show the sale price, the money saved and how the numbers were reached.
Why this calculator
Four discount questions, one calculator
Sale maths runs in both directions: sometimes you know the discount and need the price, sometimes you know the price and want to know whether the deal is real. This handles every version.
Stacked discounts done right
An extra 10 percent off an item already reduced by 30 percent is not 40 percent off. We apply the second discount to the reduced price and show the true combined rate.
Work backwards
Know the sale price but not the discount? Or the discount but not the original? Reverse modes recover whichever figure is missing.
Tax and quantity included
Add sales tax or VAT to see what actually leaves your account, and set a quantity to get the total saving across a full basket.
See the full breakdown
Every step is listed: original price, each discount applied, tax added and the final total — so you can check the shop’s maths against your own.
Instant and private
No account, no ads over the tool and no data sent anywhere. Fast enough to use while standing in the aisle deciding.
How to use it
How to calculate a discount in four steps
Pick what you know
Choose sale price, percent off, original price or the discount needed to hit a target figure.
Enter the numbers
Type the price and tap a common discount, or enter any percentage yourself.
Add the extras
Stack a coupon, add sales tax or set a quantity if you are buying more than one.
Check the breakdown
See the sale price, the amount saved, the effective discount rate and every step in between.
Benefits
Why the exact number beats a rough guess
Retail pricing is designed to feel like a bargain. Running the actual figures takes seconds and changes a surprising number of decisions.
Spot the fake bargain
Work backwards from the sale price to see whether the advertised percentage matches the actual reduction.
Understand stacked offers
30 percent off plus another 20 percent is 44 percent off, not 50. Knowing the difference stops overestimating the deal.
Compare offers fairly
Is 25 percent off better than a fixed amount off? Convert both to the same measure and the answer is obvious.
Budget with tax included
A discounted price is rarely what you pay. Adding tax up front avoids surprises at the till.
Price your own products
Sellers can check what a promotion does to margin before advertising it, using the same maths in reverse.
Set a target and work back
Know what you are willing to pay and find out exactly what discount would get you there.
The method
How to calculate a discount
The discount formula
The saving is the original price multiplied by the percentage: saving = price × (percent ÷ 100). The sale price is what remains: sale price = price × (1 − percent ÷ 100). On an 80 item at 25 percent off, the saving is 20 and the sale price is 60.
The fastest mental method is to find 10 percent by moving the decimal one place left, then scale it. On 80, ten percent is 8, so 30 percent is 24 and 15 percent is 12. For 25 percent, quarter it; for 50 percent, halve it; for 75 percent, take a quarter of the price.
Working backwards
To find the discount from two prices, divide the saving by the original: percent off = (original − sale) ÷ original × 100. To recover the original price from a sale price, divide rather than multiply: original = sale ÷ (1 − percent ÷ 100). A 60 item at 25 percent off came from 60 ÷ 0.75 = 80. Adding 25 percent back to 60 would give 75, which is the most common mistake in discount maths.
Why stacked discounts are smaller than they look
Successive discounts multiply rather than add. Taking 30 percent off and then another 20 percent leaves 0.7 × 0.8 = 0.56 of the price, which is a 44 percent discount, not 50. The order does not matter — the result is identical either way — but the gap between the advertised numbers and the real one widens as the discounts get bigger.
| Discount | You pay | On a 100 item | Quick method |
|---|---|---|---|
| 10% off | 90% | 90 saved 10 | Move the decimal one place |
| 15% off | 85% | 85 saved 15 | 10% plus half of it |
| 20% off | 80% | 80 saved 20 | Divide by 5 |
| 25% off | 75% | 75 saved 25 | Take off a quarter |
| 33% off | 67% | 67 saved 33 | Take off a third |
| 50% off | 50% | 50 saved 50 | Halve it |
| 70% off | 30% | 30 saved 70 | Three tenths of the price |
| 30% then 20% off | 56% | 56 saved 44 | Multiply 0.7 by 0.8 |
Where the tax goes
Sales tax and VAT are applied to the discounted price, not the original, so a discount reduces the tax too. On a 100 item with 20 percent off and 8 percent tax, you pay 80 plus 6.40 tax, a total of 86.40. In VAT-inclusive markets the displayed price already contains the tax, so the discount comes off the gross figure instead — check which convention your receipt uses.
Offers that are not really percentages
- Buy one get one free is 50 percent off across two items, provided you wanted both.
- Buy two get one free is 33.3 percent off across three items.
- Buy one get one half price is 25 percent off across the pair.
- Fixed amount off is a bigger percentage on cheap items and a smaller one on expensive items.
- Spend and save thresholds can push you to buy more than you intended to reach the tier.
FAQ
Discount calculator questions, answered
How do I calculate a percentage off a price?
Multiply the price by the percentage divided by 100 to get the saving, then subtract it. On a 40 item at 30 percent off, the saving is 12 and the sale price is 28. The one-step version is to multiply by what remains: 40 × 0.7 = 28.
How do I work out the original price from a sale price?
Divide the sale price by one minus the discount. A 60 item after 25 percent off came from 60 ÷ 0.75 = 80. Adding 25 percent back to 60 gives 75, which is wrong — percentages are taken from the original price, not the reduced one.
How do I find what percentage off I was given?
Subtract the sale price from the original, divide by the original and multiply by 100. From 80 down to 56 is a saving of 24, and 24 ÷ 80 × 100 = 30 percent off. Use the percent off mode above and enter both prices.
Is 30 percent off plus an extra 20 percent the same as 50 percent off?
No. Successive discounts multiply, so you pay 0.7 × 0.8 = 0.56 of the price, which is 44 percent off rather than 50. The order the discounts are applied in makes no difference to the final figure.
Is sales tax charged before or after the discount?
After. Tax is calculated on the discounted price you actually pay, so a discount reduces the tax as well. On a 100 item with 20 percent off and 8 percent tax, you pay 80 plus 6.40 in tax, giving 86.40 in total.
How much is buy one get one free as a percentage?
50 percent off across the two items, since you pay full price for one and nothing for the other. Buy two get one free works out at 33.3 percent, and buy one get one half price at 25 percent. All three only count as savings if you genuinely wanted the extra item.
What discount do I need to reach a certain price?
Divide the target price by the original, subtract from one and multiply by 100. To get a 250 item down to 180 you need (1 − 180 ÷ 250) × 100 = 28 percent off. The discount needed mode above does this for you.
Check the deal before you buy
Free, private and instant — sale price, real savings, stacked discounts, tax and the reverse maths that shows whether the offer is as good as it looks.
This discount calculator is provided for general shopping and budgeting use. Tax rules, rounding conventions and the order in which retailers apply coupons vary by country, store and promotion, so the final figure on your receipt may differ slightly. Always check the terms of an offer before relying on it.