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How this calculator works
The calculator first computes profit per sale at both the original and discounted price by subtracting the cost per unit from each. Total profit is then calculated by multiplying profit per sale by sales volume at each price point. The critical output is the extra volume needed to match original total profit — this is found by dividing the original total profit by the discounted profit per unit, then subtracting the original sales volume. The gap between required extra sales and realistic conversion uplift reveals whether a discount is a smart move or a margin trap.
Useful scenarios
- A course creator considering a 30% launch discount on a $200 course with $20 cost per sale to see how many extra enrolments are needed.
- A SaaS founder evaluating a 50% first-year discount on a $99/month product and checking whether the volume increase is realistic.
- A freelancer testing whether a 15% repeat-client discount makes sense given their current project volume and margins.
FAQ
When does a discount make sense?
Discounts make sense when: (1) you have high fixed costs and excess capacity, (2) you're launching and need social proof, (3) you're entering a competitive market, or (4) it's a limited-time offer for existing customers. They don't make sense if you're already at full capacity.
Why does cost per unit matter so much for discounts?
If your cost per unit is high, a discount cuts deeply into profit. If your cost per unit is near zero (digital products, SaaS), a discount mainly affects revenue — you still make positive margin. The calculator reveals this difference.
How do I know if the extra volume is realistic?
Check your conversion rate history. If your current conversion rate is 2% and a discount would need to triple sales, you need 6% conversion rate. For most businesses, a 20% discount might increase volume 20%–50% — but doubling or tripling is rare without major marketing spend.