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Discount Pricing Calculator

A discount is a margin decision, not a marketing one. Price percentage-off, BOGO, and spend-threshold deals against what your product actually costs you — and see the maximum you can afford to give before the deal stops paying you.

How the math works

Discount math sellers get wrong

The most expensive sentence in e-commerce is "let's just run 20% off." A percentage discount does not come out of your price — it comes out of your margin, and margin is a much smaller pool. On a product with a 30% margin, a 20% discount removes two-thirds of the profit per unit. You would need roughly three times the sales volume just to earn the same money as before the promotion.

This is why discount decisions belong to a calculator, not a gut feeling. The three deal structures below all move money, but they move it differently — and knowing the effective discount of each is what separates a promotion that grows profit from one that just grows revenue.

1. Percentage off — the margin trap

The formula is simple: sale price = price × (1 − discount%). The insight is what it does to profit. Profit per unit after the deal is sale price − cost, and every dollar of discount subtracts from that profit dollar-for-dollar:

profit_after = price × (1 − discount%) − cost

Your maximum affordable discount is your margin itself — at a 40% margin, a 40% discount is the exact point where the product sells for cost. Working backwards from a minimum acceptable margin is the professional way to set promo depth: if you want to keep at least 15 points of margin on a $60 product that costs $25, the deepest cut you can offer is about 32%.

2. BOGO — the discount in disguise

"Buy one get one free" feels like giving away 100%, but you still collect payment for one unit. The effective discount is:

effective discount = (free units ÷ total units) × 100

BOGO (1+1) is a 50% effective discount. Buy 2 get 1 free is 33.3%. Buy 3 get 1 free is 25%. Sellers use BOGO for two reasons: it moves two-plus units per order (better unit economics on shipping and fees), and the framed value — "FREE" — converts better than the equivalent percentage off. The catch is inventory: BOGO on a best-seller can drain stock you would have sold at full price.

3. Threshold deals — discount that shrinks

"$20 off when you spend $100" is a fixed discount wearing a percentage costume. At exactly $100, the customer gets 20% off. But unlike a flat percentage, the effective rate falls as the cart grows — at $180 the same deal is only 11%. Thresholds are the only structure where bigger spenders get a smaller effective discount, which is exactly why marketplaces love them for big events: they lift average order value while protecting margin on the customers who would have spent anyway.

effective discount = amount_off ÷ order_value × 100

The lever to tune is the gap between threshold and typical order value. Set the threshold about 15–25% above your current average order value and most customers will add an item to reach it — that added item is often where the deal's profit comes from.

Picking between the three

Use percentage off when you need simple, loud messaging on marketplace event pages. Use BOGO when unit economics are strong and you want to move volume per order. Use thresholds when you want to raise basket size and let the effective discount shrink on its own. Whatever you pick, run the exact deal through this calculator first: the profit-per-unit number after the discount is the only honest way to compare a promotion against just selling at full price.

Questions

Discount calculator FAQ

How much discount can I afford?

Your maximum break-even discount equals your margin: a product with a 40% margin can absorb at most a 40% discount before it sells at a loss. But "break even" is not the goal — decide on a minimum acceptable margin first, then discount down to that line, not past it. The calculator shows profit per unit after the discount so you can pick the deepest deal that still pays you.

Why does a 20% discount hurt so much?

Because a discount comes entirely out of your margin, not out of the price proportionally. On a product with a 30% margin, a 20% discount removes two-thirds of your profit per unit — you now need roughly 3x the sales volume just to earn the same total profit. This asymmetry is the single most under-estimated number in promo planning.

How do I calculate BOGO effective discount?

Buy one get one free is a 50% effective discount, not 100%: you still collect payment for one of the two units. The formula is (free units ÷ total units) × 100. Buy 2 get 1 free is 33.3%, buy 3 get 1 free is 25%. The calculator works out the effective price per unit and effective discount for any buy/get combination.

Are threshold deals better than percentage off?

Threshold deals ("$20 off orders over $100") do two things a flat percentage cannot: they raise average order value, and the effective discount shrinks as customers spend more — spend $180 on that same deal and the effective discount is only 11%. They protect margin while growing basket size, which is why marketplaces push them during big sale events.

What is a good discount for Black Friday?

Most marketplaces expect 20–40% during peak events, but that range only works on products with healthy margins or strategic purposes (clearance, customer acquisition, review velocity). Run your numbers through the calculator at the deepest discount you plan: if the profit per unit turns red, the deal needs a cost reduction, a higher anchor price, or a threshold structure instead of a flat percentage.

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