Free pricing & profit tool
Discount Calculator: Sale Price and Profit Impact
To find the price after a discount, multiply the regular price by 1 minus the discount percent: $300 with 20% off is $300 × 0.80 = $240. The harder question is what the discount does to profit. If a sale costs you $90, the discount cuts profit per sale from $210 to $150, so you need 40% more sales to earn the same total. Enter your own numbers below.
Prepared by Prospyr · Reviewed October 11, 2026 · Free, no sign-up, runs in your browser
Product, supplies and any commission or card fee you pay per sale.
Turns the extra-sales percent into a count.
Price after discount
$240.00
You give up
$60.00
20% off
Profit per sale
$210.00 → $150.00
Margin
70% → 62.5%
Extra sales to break even
40%
20 more on 50 sales
To earn the same total profit you would need about 70 sales instead of 50. If the promotion will not bring in that many additional sales, it costs you money.
A math aid using the costs you enter. It assumes your cost per sale stays the same and does not predict how many patients a promotion will bring.
Priced it? Then check what each service actually earns. See revenue per provider and service mix in Prospyr →
The formulas
- Sale price = regular price × (1 − discount % ÷ 100), or price − dollars off.
- Profit per sale = price − your cost per sale.
- Margin = profit per sale ÷ price.
- Extra sales needed = discount ÷ (sale price − cost), as a share of today's sales.
The last line is the same as old profit per sale ÷ new profit per sale, minus 1. If the new profit per sale is zero or less, the offer cannot pay for itself.
Worked example with placeholder numbers
A $100 service costs you $40 to deliver and you sell 100 a month, so profit is $6,000. At 20% off the price is $80 and profit per sale is $40. You now need 150 sales to earn $6,000, which is 50% more. Those figures are example inputs for the arithmetic, not prices or results to expect.
Related tools
See how a price sits against cost with the margin calculator and the markup calculator. To go the other way, test a raise with the price increase calculator, or price a whole visit with the treatment pricing calculator.
Frequently asked questions
How do you calculate a price after a percentage discount?
Multiply the regular price by (1 − discount ÷ 100). A $200 service with 15% off is $200 × 0.85 = $170, and the discount is $30. For a dollar discount, subtract the amount from the price.
How many extra sales do I need to make up for a discount?
Divide the discount in dollars by the profit you still earn per sale at the sale price. With a $60 discount and $150 of profit left per sale, you need 60 ÷ 150 = 40% more sales. If the sale price is at or below your cost, no number of extra sales makes up the difference.
Why does a small discount need so many extra sales?
Because the discount comes straight out of profit, not out of revenue. When your margin is thin, the same dollar discount is a bigger share of what you keep, so the extra volume has to be larger. The calculator shows this with your own cost.
What should I count as my cost per sale?
Count what you pay each time you make the sale: product or supplies, per-visit commission and card fees. Rent and salaried payroll usually stay the same whether you sell one more treatment or not, so they are left out. Enter the cost that changes with each sale.
Does this tell me whether a promotion will work?
No. It tells you the bar a promotion has to clear. Whether the offer brings in that many additional sales, rather than discounting patients who would have paid full price, is something to judge from your own booking history.
Is a dollar discount different from a percent discount?
The math is the same once you convert one to the other. $60 off a $300 service is 20% off. Dollar discounts take a larger bite out of cheaper services, which is worth checking before you run one across your whole menu.
Sources and scope
Arithmetic on the numbers you enter; the example figures are placeholders, not market prices. It assumes your cost per sale does not change and it does not forecast how many patients a promotion will bring.