How do I calculate the final sale price after a discount?

Multiply the original price by the discount percentage, divide by 100 to find your savings, and subtract that amount from the original price. Formula: Final Price = Original Price - [Original Price × (Discount % ÷ 100)].

How do double or stacked discounts work?

Stacked discounts are applied sequentially, not added together. For example, a $100 item with 20% off drops to $80. An extra 10% off coupon then applies to $80, saving an extra $8, bringing the final price to $72 (a total discount of 28%, not 30%).

What is an easy mental math trick for 20% off?

To calculate 20% off in your head, find 10% by moving the decimal point one place to the left, then double that number to get your discount. Subtract this from the original price.

Is sales tax calculated before or after the discount?

In most jurisdictions, retail sales tax is assessed on the final discounted sale price, not the original sticker price, ensuring you pay tax only on the actual amount spent.

How do I reverse calculate the original price from a discounted price?

Divide the discounted sale price by (1 - (Discount % ÷ 100)). For example, if an item is $60 after a 25% discount: $60 ÷ (1 - 0.25) = $60 ÷ 0.75 = $80 original price.

Discount Calculator

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How to Calculate Sale Prices & Discounts

Quickly determine how much you save during retail shopping, clearance sales, Black Friday deals, and promotional coupon discounts.

10% OFF

Move the decimal point 1 place to the left.
$80 → Save $8 (Pay $72)

20% OFF

Find 10% and double it.
$80 → Save $16 (Pay $64)

25% OFF

Divide the original price by 4.
$80 → Save $20 (Pay $60)

50% OFF

Cut the price exactly in half.
$80 → Save $40 (Pay $40)

The Discount Formula

Calculating the sale price involves two straightforward steps:

Discount Amount = Original Price × (Discount % ÷ 100)

Final Sale Price = Original Price − Discount Amount

Example: A $120 winter jacket on sale for 30% off:
Discount = $120 × 0.30 = $36. Final Price = $120 − $36 = $84.

Understanding Stacked / Double Discounts

When a store offers "20% off sale price PLUS an extra 10% coupon", discounts are compounded, not added:

On a $100 item, 20% off reduces the price to $80.
The 10% coupon applies to $80, deducting another $8.
Final checkout price is $72 (a 28% total discount, not 30%).

Frequently Asked Questions

Common questions about discounts, coupon codes, savings, and sales tax.

Multiply the original price by the discount percentage and divide by 100 to find your savings. Then subtract your savings from the original price. For example, on a $50 shirt with a 20% discount: $50 × 0.20 = $10 savings, making your final price $40.

Stacked discounts are calculated sequentially rather than added together. For instance, a 20% sale plus an extra 10% coupon on a $100 product equals $72 (an effective 28% discount), because the second discount applies to the reduced price, not the original retail price.

To find 20% off in your head, determine 10% by shifting the decimal point one place to the left, then double that amount. Subtract the result from the original price (e.g., 20% of $60 is $6 × 2 = $12; $60 − $12 = $48).

In most states and countries, sales tax is computed on the final discounted price after store discounts and promotions have been applied, so you only pay taxes on the actual out-of-pocket cost.

Divide the sale price by (1 − (Discount % ÷ 100)). For example, if you purchased an item on clearance for $75 with a 25% discount: $75 ÷ 0.75 = $100 original price.