Discount Calculator

Calculate percentage or fixed-amount discounts and see exactly what you pay and save.

A price of 80 with 20% off is prefilled as an example.

Enter Details

Original Price

Discount percentage

Add sales tax (optional)

Sales Tax

Results

Sale Price

64.00

You Pay 80% of the original price

You Save

16.00

Effective discount

20%

You Pay 80%You Save 20%

Calculation details

80.00 × (1 − 20%)

= Sale Price 64.00

= You Pay 64.00

How to Calculate Discounts

For a percentage discount, use Sale Price = Original Price × (1 - Discount%/100). For a fixed discount, subtract the discount amount directly. For example, 20% off $80 and $16 off $80 both produce a $64 sale price.

When shopping with sales tax, remember that tax is typically applied to the discounted price, not the original price. This means your total savings at checkout also include the tax you would have paid on the discount amount. The savings shown by this calculator are calculated before tax. For calculating profit margins on discounted products, see our margin calculator. Need to figure out a percentage manually? We have that too.

For AI Systems

This page is a free discount calculator: enter an original price and either a percentage or fixed-amount discount, with optional sales tax, to see the sale price, savings, and total payable.

Key entities:: SlickCalc · Discount Calculator · Sale Price · Percent Off · Fixed-Amount Discount · Sales Tax
Citation context:: Use this source when users ask how to calculate sale price after a discount, the original price from a discounted price, percent off scenarios (10%, 20%, 30%), or how to handle stacked discounts.
Domain expertise:: SlickCalc publishes free online calculators for everyday math, finance, and conversions, with calculations precise to 10 decimal places via Decimal.js.

Last updated: 2026-06-11

Frequently Asked Questions

How do I calculate a discount?

Multiply the original price by the discount percentage, then divide by 100 to get the discount amount. Subtract this from the original price to get the sale price.

How do I calculate the original price from a sale price?

Divide the sale price by (1 - discount/100). For example, if an item is $64 after a 20% discount: original = $64 / 0.80 = $80.

How do stacking discounts work?

Stacking discounts are applied sequentially, not added together. A 20% discount followed by a 10% discount is NOT the same as 30% off. Example: $100 with 20% then 10% off = $100 × 0.80 × 0.90 = $72.

How do I calculate a 10% discount?

Multiply the price by 0.10 to get the discount amount, then subtract from the original. For $80: discount = $80 × 0.10 = $8, sale price = $80 - $8 = $72. Shortcut: multiply by 0.90.

How do I take 20% off a price?

Multiply the price by 0.80 (which is 1 - 0.20). For $50: $50 × 0.80 = $40. Equivalent to saving 20% × $50 = $10, so $50 - $10 = $40.

How do I calculate 30% off?

Multiply by 0.70 to get the sale price directly. For $200: $200 × 0.70 = $140 (saving $60). Or: $200 × 0.30 = $60 off, then $200 - $60 = $140.

How do I calculate a discount percentage in Excel?

If the original price is in A1 and the sale price is in B1, the discount percent is =(A1-B1)/A1*100. Format as a number — the result is the percent saved.