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Shopify Discount Calculator

The Shopify Discount Calculator measures the effect of a percentage or fixed discount on selling price, revenue, and gross profit. It helps merchants test promotional offers before creating discount codes or automatic discounts in Shopify.

The calculator highlights both customer savings and the reduction in gross profit. This makes it easier to compare a headline discount with the number of additional units that may need to be sold to preserve the same total gross profit as the undiscounted offer.

Promotion details

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$
Result
—
Discounted selling price
Customer savings—
Gross profit after discount—
Gross margin after discount—
Sales lift needed—

1. Enter the regular price
Use the price before the promotion.

2. Select the discount method
Choose percentage for a rate-based discount or fixed amount for a dollar reduction.

3. Enter the discount value
For percentage discounts enter a number such as 15; for fixed discounts enter the dollar amount.

4. Add unit cost
Use product cost to see the promotion’s gross-profit effect.

5. Check required sales lift
The tool estimates how much unit volume must increase to preserve pre-discount gross profit.

Formulas:

Discounted price = Original price − Discount amount
Gross profit = Discounted price − Unit cost
Required sales lift % = (Original gross profit ÷ Discounted gross profit − 1) × 100

For percentage discounts, discount amount equals original price × discount rate. Sales lift is not calculated when discounted gross profit is zero or negative.

What the result means

The main result is the new customer price after the selected discount.

The gross-profit view excludes payment fees, fulfillment, advertising, returns, and other variable costs.

Given: Original price $80, percentage discount 15%, and product cost $28.

Calculation: Customer savings = $80 × 15% = $12. Discounted price = $80 − $12 = $68. Gross profit after discount = $68 − $28 = $40. Gross margin = $40 ÷ $68 = 58.82%. Original gross profit was $52, so sales lift needed = ($52 ÷ $40 − 1) × 100 = 30%.

Result: Discounted price = $68.00.

The promotion must sell about 30% more units to match the original total gross profit, assuming no other costs change.

Can the discount exceed the original price?

No practical refund-style discount should produce a negative selling price. The calculator floors the discounted price at zero.

What does sales lift needed mean?

It is the percentage increase in unit volume required to generate the same gross profit dollars as before the discount.

Why is required lift unavailable for some discounts?

When the discounted price is at or below unit cost, gross profit is zero or negative, so additional unit sales cannot restore the original profit under the same economics.

Should I use product cost or total variable cost?

Use product cost for a gross-profit view. For a stricter promotion analysis, include other per-order expenses by adding them to unit cost.

How do fixed and percentage discounts compare?

A fixed discount creates a larger percentage reduction on lower-priced products. A percentage discount scales with price and is often easier to apply across a collection.