Discount Calculator
Before you run a promo, see the sale price, your margin after the discount, and whether the volume lift actually leaves you better off.
Total profit change
The detail behind it
Sale price
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Margin after discount
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Profit / unit (sale)
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How the math works
Sale price = regular × (1 minus discount%). Margin after = (sale minus cost) ÷ sale.
Total profit change compares profit at the regular price and volume vs the sale price with your expected volume lift.
Is a discount worth it?
A discount cuts your margin on every unit, so it only pays off if it brings enough extra volume to more than make up the difference. This calculator pits the two against each other: profit at full price and current volume vs profit at the sale price with your expected volume lift.
The trap is deep discounts on thin margins. If a product makes $10 profit and you discount it $9, you need almost double the volume just to stand still. The total-profit-change number shows whether you actually come out ahead.
Use a realistic volume-lift estimate. Promos rarely lift volume as much as hoped, so it's safer to model conservatively.
Frequently asked questions
How do I know if a discount is profitable?
Compare total profit before and after. If the extra volume at the lower margin produces more total profit than full price did, the promo pays off, which the calculator shows directly.
Why does a small discount need so much extra volume?
Because the discount comes straight out of profit, not revenue. On a thin margin, a few dollars off can halve your per-unit profit, so you need far more units to break even.
What volume lift should I assume?
Be conservative. Many promos lift volume far less than expected; model a modest lift and treat anything more as upside.
Is it free?
Yes, free with no signup; it runs in your browser.
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