Discount Margin Calculator
See whether a promotion still leaves enough profit after product cost, percentage fees, and fixed selling fees.
Discounted margin
Formula
Final Price = Original Price * (1 - Discount / 100)
Profit = Final Price - Cost - Fees
Margin = Profit / Final Price * 100 How the formula works
The calculator first reduces the original price by the discount percentage. It then subtracts the cost, percentage fee, and fixed fee from the discounted price to estimate profit.
The break-even discount is the largest discount that would reduce profit to zero under the costs and fees entered.
Complete example
A product normally sells for $80 and costs $42. You plan a 20% promotion. The selling fee is 3% plus a $0.30 fixed fee.
- Final price: $80 * (1 - 20%) = $64
- Savings shown to customer: $16
- Fee total: $64 * 3% + $0.30 = $2.22
- Profit: $64 - $42 - $2.22 = $19.78
- Margin after discount: $19.78 / $64 * 100 = 30.91%
The promotion is still profitable in this example, but the final margin must be compared against your overhead, ad spend, and normal margin target.
Read how discounts affect profit margin before planning frequent promotions.
When to use this calculator
- Test a sale price before launching a promotion.
- Find the margin left after marketplace or payment fees.
- Compare 10%, 20%, and 30% discounts before choosing an offer.
- Check whether a coupon would push a product below break-even.
How to interpret the results
Final price is what the customer pays before tax or shipping. Profit is the amount left after cost and fees. Margin shows that profit as a percentage of final price.
If the break-even discount is close to your planned discount, the promotion leaves little room for ads, returns, refunds, or fulfillment surprises.
Common mistakes
- Calculating discount savings but not the margin left after cost.
- Forgetting that percentage fees are charged on the discounted sale amount.
- Ignoring fixed fees on lower-priced products.
- Using a discount to drive volume without checking whether volume can cover lower margin.
- Assuming a promotion is successful just because revenue increases.
Related tools
- Discount Calculator: calculate simple final price and savings.
- Product Pricing Calculator: set a regular price that can support planned discounts.
- Ecommerce Profit Calculator: include shipping, ads, returns, and platform fees.
- Profit Margin Calculator: check margin from known revenue and cost.
FAQ
Why calculate margin after a discount?
A discount lowers revenue immediately, but cost and many fees remain. Checking margin after the discount helps avoid selling below break-even.
What is a break-even discount?
It is the largest discount that brings profit to zero based on the cost and fees entered.
Does this include sales tax?
No. This calculator focuses on price, cost, selling fees, and profit margin. Add tax rules separately if needed.
What costs should I enter?
Enter the cost required to deliver the product or service before the discount, such as product cost, packaging, direct labor, or fulfillment cost.
Should payment fees be included?
Yes. Percentage fees and fixed fees reduce profit after the discount, so they should be included when they apply to the sale.
Can the break-even discount be negative?
Yes. A negative break-even discount means the original price is already too low to cover cost and fees under the inputs entered.
Is a profitable discount always a good promotion?
No. The discount may still reduce cash flow, train customers to wait for sales, or require more volume than the business can handle.
Disclaimer
This calculator is for general pricing and business planning. It does not replace accounting, tax, platform policy, or financial advice.