MultiConvers

Discount Calculator

Turn a list price and a “percent off” sticker into the amount saved and the till total — tax and stacked coupons are a second step.

How to use

  1. Enter the original (list) price before the sale.
  2. Enter the discount as 20 for 20% off, not 0.20.
  3. Read the amount saved and the sale price.
  4. For a second coupon, use the sale price as the next original. Do not add the percents.

How it works

A discount is taken from the original price. 20% off 50 is 0.20 × 50 = 10 saved, leaving 40 to pay. It is not 20% of the 40. That mix-up is how people think a 20% sale on an already reduced ticket is “40% off the first price.”

Two coupons in a row multiply. 20% then another 20% is 0.80 × 0.80 = 0.64 of the list, which is 36% off, not 40%. Run this calculator twice: first 50 → 40, then 40 at 20% → 32.

Tax is not included. If the sticker is pre-tax, add tax to the sale price afterward. If the shop takes the discount after tax, enter the taxed figure as the original — the tool does not know local rules.

A 100% discount is free. More than 100% is a defined negative price and is almost never what a till does; treat it as a check that you typed the percent wrong.

Percentage change from 50 to 40 is also 20%, but that page starts from two observed prices. Markup and margin start from cost. This page starts from a list price and a planned percent off.

Formula

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

Worked examples

  • 20% off 50

    50 at 20% off → save 10, pay 40

  • 15% off 80

    80 at 15% off → save 12, pay 68

Useful notes

  • Stacked coupons multiply; they do not add.
  • Sales tax is not applied here.
  • Enter 20 for 20%, not 0.20.

FAQ

How do I calculate 20% off a price?

Multiply the original price by 0.20 to get the amount saved, then subtract that from the original. 20% off 50 is 10 off, leaving 40.

Does this include sales tax?

No. It only applies the percent off the figure you enter. Add tax afterwards if you need an out-the-door total.

Can I apply two discounts in a row?

Use the sale price from the first discount as the original price for the second. Two 20% discounts are not 40% off; they are 20% then 20% of what remains.

What is 15% off 80?

You save 12 and pay 68.

Is “save 20%” the same as a 20% decrease?

On one markdown, yes: 50 to 40 is both 20% off and a 20% decrease. Use this page when the percent is given; use percentage change when both prices are given.

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