A 20% discount can wipe out far more than 20% of your profit. Enter your price, margin, and discount to see the extra sales you'd need just to break even — then plan every promo with the full tool.
Know the extra volume a discount needs — before you run it.
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Because a discount comes entirely out of your profit margin, not your cost. If you make 50% margin and give a 20% discount, you are giving away 20 points of a 50-point margin — nearly half your profit per sale. That is why you often need to sell far more than 20% extra units just to break even on a 20% discount.
Compare the extra sales you realistically expect to the break-even volume the discount requires. If a promo needs 40% more sales to break even and you only expect 15% more, it loses money. This calculator gives you that break-even number so you can decide with data instead of hope.
A ready-to-use spreadsheet (Excel & Google Sheets): profit per sale before and after a discount, the break-even extra volume, and side-by-side discount scenarios — delivered instantly after checkout. AI-assisted, human-built; not financial advice.
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