Promotion Profit Calculator
Compare regular and discounted contribution per sale, then estimate the whole-sale volume needed to preserve baseline contribution.
Free to use · No email gate · Inputs stay in your browser
Your assumptions
Example figures are loaded. Use consistent definitions and periods.
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Your planning result
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Summaries include your figures. Share deliberately. Display values are rounded; calculations use the entered assumptions.
See the comparison
Read the example.
At $500 price and $300 variable cost, 100 regular sales contribute $20,000. A 20% discount makes the price $400 and contribution $100. It takes 200 promotional sales—100 more—to preserve that contribution.
The method
Assumptions and limits
- The baseline must have positive contribution. Enter the true incremental variable cost, including payment fees, discounts and expected refunds where appropriate.
- A positive baseline target cannot be preserved at zero or negative promotional contribution; the tool reports no finite target.
- This models a percentage discount, not bundles, tiered pricing, inventory clearance, demand response or customer lifetime value.
- It does not predict sales. Fixed overhead and campaign costs are excluded; the preserved total is contribution, not net profit.
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Custom-built by Rock Advertising · Updated October 21, 2026 · Rock Toolbox