How do I calculate a discount?

Multiply the original price by the discount percentage divided by 100. Subtract that from the original price. For 20% off $80: $80 × 0.20 = $16 savings, final price $64.

How do I calculate the original price before a discount?

Divide the sale price by (1 − discount% ÷ 100). For example, if the sale price is $64 after 20% off: $64 ÷ 0.80 = $80.

How do I stack multiple discounts?

Apply each discount sequentially. 20% off then 10% off $100: $100 × 0.80 = $80, then $80 × 0.90 = $72. This is NOT the same as 30% off.

Is a 50% discount the same as half price?

Yes! A 50% discount means you pay half the original price.

Discount Calculator

Calculate the final price after applying a discount.

What do I pay after X% off?

Original pricelessDiscount%

0Original price 80

Original price: 80; 100% baseline
Change: −16; −20% of 80
You pay: 64; after the decrease

Original price 80 is the 100% baseline. The withdrawn segment is 16 saved, which is −20% of that baseline — the value shrinks.

You save 16 and pay 64 — the discount is measured against the original price 80.

You save: 16

Formula

Calculate the saving: 80 × 20% = 16

Subtract from the price: 80 − 16 = 64

Verify

64 ÷ 0.8 = 80

Check it backwards: reversing the discount on the sale price returns the original price.

Instant answer

What is 20% off $80?

20% off 80 is 64, a saving of 16.

20% off 80 saves 16, giving a final price of 64. The saving is the discount percentage applied to the original price.

Formula: Saving = (Discount% ÷ 100) × Price · Sale Price = Price − Saving
Definition: A discount is a percentage reduction of the original price; the sale price is the original price minus that amount.

Convert to decimal:20% = 20 ÷ 100 = 0.2
Multiply:0.2 × 80 = 16
Subtract the saving:80 − 16 = 64

How to use

01Enter the original price — The full price before the discount.
02Enter the discount percentage — How much percent off (e.g. 20%).
03See the sale price — The final price and your savings appear instantly.

Tab to move between fields · Results update instantly as you typeResults update instantly as you type

How Discount Percentages Work

A discount reduces a price by a given percentage. Retailers use them for seasonal sales, clearance events, loyalty rewards, and promotional campaigns. Being able to quickly calculate the final price helps you comparison-shop confidently and avoid impulse purchases that aren't actually good deals.

The Formula: Final Price = Original Price × (1 − Discount% ÷ 100)

The savings amount is simply the original price multiplied by the discount rate. For a $80 item at 20% off: $80 × 0.20 = $16 saved, leaving a final price of $64.

Smart Shopping Scenarios

Stacked discounts: A $200 jacket is 30% off, and you have a 10% member coupon. Apply 30% first ($200 → $140), then 10% ($140 → $126). Note: this is not the same as 40% off ($120).
Bulk buying: A supplier offers 15% off orders over $500. On a $750 order, you save $112.50 — paying $637.50 instead.
Comparing stores: Store A sells a TV at $899 with 25% off ($674.25). Store B lists it at $729 with 10% off ($656.10). Store B wins despite the smaller percentage.

Related Tools

If you already know the sale price and want to find the original, use our Reverse Percentage Calculator. For adding profit margins instead of removing them, the Markup Calculator is the right tool. And if you want to understand what percentage one price is of another, try What Percentage Is X of Y?

Common Discount Examples

Tap any row to open the calculator with values pre-filled — perfect for checking a sale before you buy.

Discount	Original → Sale	You save
10% off $50	$50 → $45.00	$5.00	Open
15% off $80	$80 → $68.00	$12.00	Open
20% off $100	$100 → $80.00	$20.00	Open
25% off $120	$120 → $90.00	$30.00	Open
30% off $150	$150 → $105.00	$45.00	Open
40% off $200	$200 → $120.00	$80.00	Open
50% off $250	$250 → $125.00	$125.00	Open
60% off $300	$300 → $120.00	$180.00	Open
70% off $500	$500 → $150.00	$350.00	Open

Discounts — worked examples

Discounts — worked examples
Question	Calculation	Answer	Open
10% off 50	50 − ((10 ÷ 100) × 50)	45	Prefilled
15% off 200	200 − ((15 ÷ 100) × 200)	170	Prefilled
20% off 80	80 − ((20 ÷ 100) × 80)	64	Prefilled
25% off 120	120 − ((25 ÷ 100) × 120)	90	Prefilled
30% off 150	150 − ((30 ÷ 100) × 150)	105	Prefilled
50% off 60	60 − ((50 ÷ 100) × 60)	30	Prefilled
70% off 400	400 − ((70 ÷ 100) × 400)	120	Prefilled

Every figure above is produced by the same calculation engine that powers the calculator on this page.

Calculation method and limitations

Method: The discount percentage is converted to a decimal, multiplied by the price to get the saving, and subtracted from the price.

Limitations

Stacked discounts multiply rather than add: 20% then 10% off is 28% off, not 30%.
Taxes and shipping are not included in the sale price.
Rounding to two decimals may differ by a cent from a retailer's own rounding rule.

Method and examples last reviewed August 6, 2026 by the Snap Percent Calc editorial team. All calculations run locally in your browser.

Frequently Asked Questions

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