Discount Calculator

Written byOleh Soloninupdated 5 October 2026

Currency

Calculation mode

Original price

Discount (%)

Result

Price after discount

$8,500.00

Savings amount

$1,500.00

Original price

$10,000.00

Discount (%)

15%

Effective discount (%)

15%

Working

10,000 × (1 − 15%) = 8,500

This result is informational only and is not professional advice.

Price after discount$8,500.00

Savings$1,500.00

Sale price, percent off, original price, stacked discounts and multi-buys

Work out a sale price and the saving, the percent off from two prices, the original price, two discounts in a row, and multi-buy deals such as 3 for 2 or a second item at half price, with the formula for each.

How you work out a discount depends on what you know: the price and the percentage, two prices, or only the sale price. This calculator handles each case and shows the working with your numbers so you can check it.

It also covers the cases that are easy to get wrong: two discounts in a row, which do not simply add up, and deals like 3 for 2 or a second item at half price, where the real discount is smaller than it looks.

How to use

Choose the task: sale price, original price, percent off, stacked discounts or a multi-buy deal.
Enter the numbers you know; the fields change to match the task.
Read the price, the saving, the overall percent off and the Working line.

Discount formulas

A percentage discount is a share of the original price. So the sale price is the original price multiplied by (1 − discount), and the original price is the sale price divided by the same number.

Worked out with this calculator.
To find	Formula	Example
Sale price	price × (1 − discount ÷ 100)	250 × (1 − 15%) = 212.50
Amount saved	price × discount ÷ 100	250 × 15% = 37.50
Percent off	(1 − new price ÷ old price) × 100	(1 − 34.90 ÷ 49.90) × 100 = 30.06%
Original price	sale price ÷ (1 − discount ÷ 100)	85 ÷ (1 − 15%) = 100

Sale price table

For a quick estimate, find the percentage and the price below. Other prices scale in proportion: 30% off 300 is 90 off.

Price after the discount. Worked out with this calculator.
Discount	Off 100	Off 500	Off 1,000
10%	90	450	900
15%	85	425	850
20%	80	400	800
25%	75	375	750
30%	70	350	700
40%	60	300	600
50%	50	250	500
70%	30	150	300

Two discounts in a row

The second discount applies to the already reduced price, so the total is less than the two added together. 20% then 20%: 100 → 80 → 64, a total of 36%, not 40%. 50% then another 30% off is 65%, not 80%.

The combined discount is 1 − (1 − first) × (1 − second), and the order of the two makes no difference.

3 for 2 and second item at half price

With three items at the same price, 3 for 2 is a 33.33% discount, because you pay for two of the three; when the free one is the cheapest of different prices, the discount is its price divided by the total of all three. 2 for 1 is 50% off the pair. It is only a saving if you wanted all the items: the price per item is what you pay divided by everything you take.

A second item at half price is 25% off two items of the same price, not 50%: two 20 items cost 30 instead of 40. When the items cost different amounts and the discount goes on the cheaper one, the share is smaller still: 30 and 20 with half off the second is 20% off the total.

What this calculator shows

The sale price and the amount saved
The percent off from two prices, and the original price
The overall percentage of two discounts in a row
The real discount on multi-buy and second-item deals, and the price per item

What to keep in mind

The discount applies to the item price; delivery, tax and loyalty points are not included.
For a second-item deal the discount applies to the cheaper of the two items; check the terms of the offer.
Amounts are rounded to two decimal places.

FAQs

How do I calculate a discount?

Multiply the price by the percentage and divide by 100: 15% off 250 is 37.50, so you pay 212.50. In one step, multiply the price by 0.85.

How do I work out the percent off from two prices?

(1 − new price ÷ old price) × 100. A price cut from 49.90 to 34.90 is (1 − 0.6994) × 100 = 30.06% off.

How do I find the original price before a discount?

Divide the sale price by (1 − discount): 85 after 15% off was 85 ÷ 0.85 = 100. Adding 15% back to 85 would give 97.75, which is wrong.

Why don't two 20% discounts make 40% off?

The second applies to the reduced price: 100 → 80 → 64, a 36% total. In general the combined discount is 1 − (1 − first) × (1 − second).

How good is a 3 for 2 deal?

With equal prices it is 33.33% off, since you pay for two of three items; with different prices and the cheapest one free, it is less. It only saves money if you would have bought all three.

What does buy one, get one half price work out to?

25% off two items of the same price: you pay 1.5 items' worth for 2. With different prices and the discount on the cheaper item, the total discount is smaller.

How do I work out 50% off and then 30% off?

Multiply the price by 0.5 and then by 0.7, which leaves 35% of the original: a total of 65% off. From 1,000 you pay 350.

Worked example

15% off 100

Input: Price 100; discount 15%

Output: Sale price 85; saving 15

Note: With a further 10% off at the till the price becomes 76.50, a total discount of 23.5%.

Useful links

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Result

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Discount	Off 100	Off 500	Off 1,000
10%	90	450	900
15%	85	425	850
20%	80	400	800
25%	75	375	750
30%	70	350	700
40%	60	300	600
50%	50	250	500
70%	30	150	300

Discount	Off 100	Off 500	Off 1,000
10%	90	450	900
15%	85	425	850
20%	80	400	800
25%	75	375	750
30%	70	350	700
40%	60	300	600
50%	50	250	500
70%	30	150	300

Discount	Off 100	Off 500	Off 1,000
10%	90	450	900
15%	85	425	850
20%	80	400	800
25%	75	375	750
30%	70	350	700
40%	60	300	600
50%	50	250	500
70%	30	150	300