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Discount Calculator

Calculate final sale price, discount amount saved, and double discount / stackable coupon savings instantly.

Runs in your browser. Nothing you add is uploaded.

What the Discount Calculator does

A discount calculation is simple in one direction and surprisingly error-prone in the others. This calculator handles the three questions that come up: what does an item cost after X% off, what percentage discount does a given saving represent, and what was the original price before a discount was applied. It also handles stacked discounts correctly, which almost nobody does mentally.

How to calculate a discount

  1. Enter the original price.
  2. Enter the discount percentage, or the sale price if you want to work out the percentage instead.
  3. Read the amount saved and the final price.
  4. For stacked offers, apply each discount in sequence rather than adding the percentages together.

The Discount Calculator runs entirely in your browser — nothing you enter is uploaded, stored, or logged.

How it works

Discounted Price Formula

Sale Price = Original Price × (1 - Discount% / 100)

Savings = Original Price - Sale Price.

Example: $80 item with 25% discount: Sale Price = $80 * 0.75 = $60 (You save $20).

When to use it

Checking a sale price is what it claims

Advertised discounts are sometimes calculated against an inflated list price, or simply mis-stated. Verifying takes seconds.

Setting a promotional price

Working backwards from the margin you need to the discount you can offer is the correct order for pricing a promotion.

Comparing competing offers

A flat amount off and a percentage off are only comparable once both are expressed the same way, which depends on the base price.

Good to know

  • Stacked discounts multiply, they do not add: 20% off then a further 10% off is 28% total, because 0.8 × 0.9 = 0.72.
  • 'Buy one get one free' is a 50% discount across two units, not 100% off.
  • To find the original price from a sale price, divide by (1 − discount/100). A ₹720 item after 20% off had a list price of ₹900.
  • Check whether the discount applies before or after tax — it changes the final figure.

Frequently asked questions

How do double discounts work?

An extra 10% off an already 50% discounted item applies to the discounted price, not the original MSRP.

How do I calculate the final price after a discount?

Multiply the original price by (1 − discount/100). A ₹2,400 item at 35% off costs ₹2,400 × 0.65 = ₹1,560, with a saving of ₹840. Calculating the discount amount and subtracting it gives the same result in two steps.

How do two discounts combine?

By multiplication, not addition. 30% off followed by 20% off is not 50% off — it is 0.7 × 0.8 = 0.56, a 44% total discount. This is why sequential offers always disappoint relative to the sum of their headline numbers.

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

Divide the sale price by (1 − discount/100). An item selling at ₹1,275 after 15% off was originally ₹1,275 ÷ 0.85 = ₹1,500. Adding 15% back to ₹1,275 gives ₹1,466, which is wrong, because the 15% was calculated on the higher original price.

What percentage discount is a given saving?

Divide the amount saved by the original price and multiply by 100. Saving ₹450 on a ₹1,800 item is a 25% discount. The original price is always the denominator.

Should discount be applied before or after tax?

Normally before. The discount reduces the taxable value, and tax is then charged on the reduced amount. Applying tax first and discounting the total produces a different, generally incorrect figure for invoicing purposes.

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