Free Discount Impact Calculator
See how discounts change profit and the extra sales needed to recover your original contribution. Calculate locally, copy results or download a report. No signup required.
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How to use the discount impact calculator
See how discounts change profit and the extra sales needed to recover your original contribution. No signup required.
- Open the Discount Impact Calculator and select the currency used for all your inputs. Currency changes only the display; it does not convert amounts.
- Enter your real selling costs and any percentage rates. Load illustrative example only to learn the controls; its rates are not provider pricing.
- Adjust your prices, costs and profit targets to compare the live estimate. Review the formula and any undefined or unattainable results.
- Select Copy results or Download report to keep the inputs and calculation. Your entries are not saved when you leave the page.
Who should run the numbers before a sale
A discount feels like a simple way to boost sales, but it comes straight out of profit. Online store owners planning a holiday sale, market sellers thinking about a bundle deal and service businesses offering an intro rate all face the same question: how many more sales do I need to make the discount worth it?
This calculator answers that with your own figures. You enter the original price, your cost per unit, any percentage selling fee, any fixed fee per unit, the discount and the volume you expect. It is useful before you announce a promotion, not after.
A worked example with real numbers
Take a product priced at 80 with a unit cost of 40, a 5 percent selling fee and a fixed fee of 0.30 per unit. You plan a 15 percent discount and expect 200 sales. The original contribution is 80 times 0.95, minus 40, minus 0.30, which equals 35.70 per unit.
The discounted price is 80 times 0.85, which is 68.00. The new contribution is 68 times 0.95, minus 40.30, which equals 24.30. Profit per unit falls by 11.40, a 31.93 percent drop. To earn the same total profit, you need 35.70 divided by 24.30, or 1.4691 times the original volume. That means 46.91 percent more sales. At 200 discounted sales, profit is 4,860.00.
The maximum discount before loss is 35.70 divided by 76.00, about 46.97 percent. The scenario table confirms it: at 30 percent off each sale still earns 12.90, but at 50 percent off each sale loses 2.30.
How the results are calculated
Unit contribution is selling price times one minus the fee rate, minus unit cost, minus the fixed fee. The tool computes this at the original price and at the discounted price. Profit reduction compares the two. Extra sales needed equals original contribution divided by discounted contribution, minus one, shown as a percentage.
The maximum discount is the original contribution divided by the price after percentage fees. Beyond that point every sale loses money, so no amount of extra volume restores profit. When this happens, the tool shows the related result as not available instead of a misleading number. The currency setting changes only the symbol shown, not the amounts.
Common mistakes to avoid
The most common mistake is leaving costs out. If you forget packaging, shipping you pay for or payment processing, your contribution looks larger than it is and the discount seems safer. Put every per-unit cost in the cost field, and percentage-based fees in the fee field, but never count one cost in both places.
Another mistake is assuming extra sales will appear just because you need them. The calculator shows the volume required, not the volume you will get. Compare it with past promotions. Also remember that a discount may pull forward sales that would have happened anyway. For major pricing decisions, consider reviewing your plan with an accountant.
Useful tips and limitations
- Use consistent per-unit and per-order amounts. Avoid counting a cost twice.
- Review the assumptions before making a pricing decision; actual charges can differ from your inputs.
- Check the scenario table first to see at a glance which discount levels keep each sale profitable.
- Run the calculator twice, once with your best guess at costs and once with higher costs, to see how sensitive the result is.
Common questions
Why can a small discount require many more sales?
The discount reduces revenue while unit costs remain unchanged. A product priced at 100 with cost 60 earns 40 before a discount; at 20% off it earns 20 and requires twice as many sales to match profit.
Can higher volume fix a loss-making discounted product?
If each discounted sale has zero or negative contribution, additional sales cannot recover positive baseline profit under the same cost assumptions. Change the offer or costs first.
Why does the extra sales figure grow so quickly at higher discounts?
Your cost per unit stays the same while the price drops, so the contribution shrinks faster than the price. As contribution nears zero, the required volume rises steeply.
Should I include sales tax in the price?
No. Enter the price you actually keep before tax. Tax collected for the government is not your revenue and would make profit look higher than it is.
What does the planned volume field change?
It only affects the discounted profit at planned volume result. The per-unit figures and extra sales percentage do not depend on it.
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