Free tool

Discount calculator: work out the sale price

What does an item cost at 15% off? How many percent is $5 off? And how big is the discount in a reduced price? The calculator answers all three. It works out percentage discounts per unit and rounds down to the cent, the way Shopify's checkout does.

By Max Handrik · Updated October 13, 2026

What do you want to work out?Price with a percentage offPrice with a fixed amount offPercent off between two prices

Original price

As in your store, for example 49.90

Discount in %

Quantity (optional, units)

Result

Price after discount: $42.42
You save: $7.48

Rounded down like Shopify's checkout: 15% of this price is exactly $7.485. Shopify takes off $7.48 per unit.

How the calculator works

A discount is a reduction of the price, as a percentage or as a fixed amount. Everything is calculated in whole cents, and percentage discounts the way Shopify's checkout does it.

Price after discount: price minus discount. 15% of $49.90 is $7.485 on paper. Shopify cuts it to the cent per unit and takes off $7.48, so the item costs $42.42.
Percent off between two prices: original price minus sale price, divided by the original price. From $49.90 to $39.90 is $10.00 less, so 20.04% off.
Fixed amount: $5 off $49.90 is 10.02%. The calculator rounds the percentage to two decimals, never the amount.
Two discounts in a row don't add up: 10% and then another 10% on $100 leaves $81, which is 19% off, not 20%.
Nothing leaves your browser. The calculator runs entirely on this page. Your numbers are neither stored nor sent anywhere.

Creating the discount in Shopify

You create a percentage or fixed amount discount in Shopify under Discounts, as a code or automatic discount. Each discount has one minimum quantity or one minimum purchase amount. Several tiers like “10% off 3 or more, 15% off 5 or more” need a separate discount per tier without an app. What each tier costs and brings in is what the tiered discount calculator shows.

With Hand-E AI Discounts all tiers sit in one discount, and you create it from one sentence. The cart preview in the app calculates exactly like this calculator. A widget shows the discount on the product page.

Common questions

How do I calculate the percent off?

Divide the amount you save by the original price and multiply by 100. If an item drops from $49.90 to $39.90, you save $10.00. 10.00 divided by 49.90 is 0.2004, so 20.04% off.

What is $49.90 with 15% off?

$42.42. 15% of $49.90 is $7.485 on paper. Shopify cuts the discount per unit to the cent and takes off $7.48. A calculator that rounds would show $42.41.

Are 10% and another 10% the same as 20% off?

No, not when the second discount applies to the already reduced price. $100 minus 10% is $90, minus another 10% is $81. That is 19% less, not 20%.

Does the discount calculator store what I enter?

No. It calculates entirely in your browser. There is no account and no sign-in, and nothing you enter is sent anywhere.

Related guides

Multiple quantity breaks don't fit in one discount

In Shopify's discount form, you set one minimum purchase requirement with one value. So each discount has one threshold. For 10% off 5 or more items and 15% off 10 or more, you need two separate automatic discounts. Or you use an app that keeps every tier in one discount.

The discount is set up but does not apply at checkout

Whether it is an automatic discount or a discount code, check two things first: the discount's own conditions and Shopify's rules for how discounts work together. These are combinations, minimum purchase requirements, customer eligibility, active dates and the limit of 25 active automatic discounts. Go through the points in order, then check the result with a test order.

Two discounts should apply together

Shopify puts every discount into a class: product, order or shipping. Two discounts only apply together when each one allows the other's class. Shopify then applies product discounts first, order discounts next and shipping last. When they are not allowed to combine, the better one wins.