Discount Calculator – Sale Price, % Off & Amount Saved

Discount Calculator

Sale price = original price × (1 − discount ÷ 100), so 25% off $120 takes off $30 and you pay $90; an extra 10% off that brings it to $81, a 32.5% total discount. The calculator can also add sales tax or work back from a sale price to the original price.

By the Calculators With Steps team · Updated November 10, 2026 · How we check our math

How to use the discount calculator

Choose what you want to find from the drop-down:

You know	Choose	Example
The price and the % off	Sale price after a % discount	$120 at 25% off = $90
The price and a fixed amount off	Sale price after an amount off	₹2,499 with ₹500 off = ₹1,999
The sale price and the % off	Original price from the sale price	$90 after 25% off = $120
The original and sale prices	Discount % from original and sale price	$80 → $60 = 25% off

For the first two options you can also enter an extra discount (a coupon or member discount taken off the reduced price) and a sales tax rate. The currency menu switches between dollars, rupees, euros, pounds and more.

Discount formulas

Amount off = original price × discount % ÷ 100

Sale price = original price × (1 − discount % ÷ 100)

Discount % = (original price − sale price) ÷ original price × 100

Original price = sale price ÷ (1 − discount % ÷ 100)

With a stacked discount, multiply the factors together: sale price = original × (1 − d₁) × (1 − d₂), where d₁ and d₂ are the two discounts as decimals. Sales tax, if any, is added last: final price = sale price × (1 + tax rate).

Worked example: stacked discount with sales tax

A jacket is marked $120. It is 25% off, you have a coupon for an extra 10% off, and sales tax is 8%.

Step	Working	Result
First discount	120 × (1 − 0.25)	$90.00
Extra 10% off	90 × (1 − 0.10)	$81.00
Total saved	120 − 81	$39.00
Effective discount	39 ÷ 120 × 100	32.5%
Sales tax	81 × 0.08	$6.48
You pay	81 + 6.48	$87.48

The two discounts add up to 35% on paper, but the real saving is 32.5%, because the 10% coupon is taken from $90 rather than $120.

Common discount mistakes

Adding stacked discounts. “30% off, then an extra 20% off” is 44% off in total, not 50%. The order does not matter: 20% then 30% also gives 44%.
Reversing a discount by adding the percentage back. If something costs $90 after 25% off, the original was $120, not $112.50. Divide by 0.75 instead of multiplying by 1.25.
Comparing “% off” with “amount off” by eye. $20 off a $120 item is 16.7% off, which is less than a 25% discount. Use the discount % option to compare offers on equal terms.
Forgetting tax. A $90 sale price in a state with 8% tax costs $97.20 at the register. Use the sales tax calculator for tax on its own.

Discounts in India: MRP, flat offers and GST

In India the maximum retail price (MRP) printed on a product already includes GST, so the discounted price is what you pay. For example, 40% off an MRP of ₹1,999 brings it to ₹1,199.40, a saving of ₹799.60. A “flat ₹500 off” on ₹2,499 brings the price to ₹1,999, which is a discount of 20.01%. That is useful when comparing a flat offer with a percentage offer on the same item.

For business invoices where GST is charged on top of a discounted value, apply the discount first and then the GST rate. The GST calculator adds or removes GST at 5%, 18% and the other slabs.

Which is better: a percentage off or a fixed amount off?

A percentage discount grows with the price, while a fixed amount stays the same, so the better deal depends on what you buy. Compare “25% off” with “$25 off”:

Price	25% off saves	$25 off saves	Better deal
$80	$20.00	$25.00	$25 off
$100	$25.00	$25.00	Same
$150	$37.50	$25.00	25% off

The break-even price is the fixed amount divided by the percentage as a decimal: $25 ÷ 0.25 = $100. Above that price the percentage wins. Stores often let you use only one of the two, so run both through the calculator before you check out.

Quick discount tricks

10% off: move the decimal point one place left and subtract. 10% off $64 is $64 − $6.40 = $57.60.
25% off: divide by 4 and subtract, or multiply by 0.75.
“Buy one, get one 50% off” on two items of the same price works out to 25% off both.
To check a deal against a price you know, find the percentage between the two with the percentage calculator.

Discount Calculator: frequently asked questions

How do I calculate a discount?

Multiply the original price by the discount percentage and divide by 100 to get the amount off, then subtract it. For 25% off $120, the discount is $30 and the sale price is $90.

How do I calculate the discount percentage from two prices?

Subtract the sale price from the original price, divide by the original price and multiply by 100. A price cut from $80 to $60 is (80 − 60) ÷ 80 × 100 = 25% off.

Is 30% off plus an extra 20% off the same as 50% off?

No. The second discount applies to the already reduced price, so you pay 0.70 × 0.80 = 0.56 of the original, which is 44% off. On a $100 item you save $44, not $50.

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

Divide the sale price by (1 − discount ÷ 100). If an item costs $90 after 25% off, the original price was 90 ÷ 0.75 = $120. Adding 25% to $90 gives $112.50, which is wrong.

Is sales tax charged before or after the discount?

In most U.S. states, sales tax is charged on the discounted price for store discounts. With 25% and an extra 10% off a $120 item and 8% sales tax, you pay $81 plus $6.48 tax, or $87.48. Some states tax the full price when a manufacturer's coupon is used.

How do I calculate a discount in rupees on MRP?

Multiply the MRP by (1 − discount ÷ 100). 40% off an MRP of ₹1,999 gives ₹1,199.40, a saving of ₹799.60. MRP in India already includes GST, so there is no tax to add.

What is the discount formula in Excel?

With the original price in A2 and the discount percentage in B2 (entered as 25%), the sale price is =A2*(1-B2). With the original price in A2 and the sale price in B2, the discount percentage is =(A2-B2)/A2, formatted as a percentage.