Reverse Margin Calculator | Calculate Selling Price from Cost & Margin
Determine the exact selling price and markup needed to hit your target profit margins after item costs and marketplace fees.
Reverse Margin Calculator
What Is a Reverse Margin Calculator and Why Should You Price Backwards?
Most business owners set prices from the bottom up: they take their product cost, add an arbitrary markup percentage, and hope there is enough money left over to turn a profit. Reverse margin calculation (target pricing) flips this equation. You start with your total unit cost and your required target profit margin percentage, then work backward to determine the exact selling price needed to hit your financial goals.
The Reverse Margin Formula: How to Calculate Selling Price from Cost and Margin
To calculate the required selling price from your buy cost and desired profit margin percentage, use the standard target pricing formula:
1. Target Selling Price Formula
Calculates the exact retail price required to achieve your target margin percentage:
Selling Price = Cost Price / (1 - (Target Margin % / 100))2. Dollar Profit per Unit Formula
The raw cash profit generated on each sale at the target price:
Profit Amount = Selling Price - Cost PriceThe Math Trap: Why Multiplying Cost Destroys Your Margins
The most common pricing mistake in eCommerce and retail is multiplying cost by your desired profit percentage. If an item costs $70 and you want a 30% profit margin, simply adding 30% ($70 × 1.30 = $91) gives you a 30% markup, but only a 23.08% margin.
- Incorrect Method (Cost Markup):
$70 × 1.30 = $91.00→ Profit = $21.00 → Actual Margin = 23.08% - Correct Reverse Margin Method:
$70 / (1 - 0.30) = $70 / 0.70 = $100.00 - Resulting Profit:
$100.00 - $70.00 = $30.00 - True Margin Achieved:
($30.00 / $100.00) × 100 = 30.00%
Notice the difference: The incorrect formula underprices the product by $9.00 and deprives the business of nearly 7% in real profit margin.
Target Margin Pricing Reference Table
Use this reference table to find your required selling price across common profit margin targets based on a baseline $100 cost:
| Target Profit Margin % | Required Selling Price ($100 Cost) | Cash Profit per Unit | Required Cost Markup % |
|---|---|---|---|
| 15% Target Margin | $117.65 | $17.65 | 17.65% Markup |
| 20% Target Margin | $125.00 | $25.00 | 25.00% Markup |
| 25% Target Margin | $133.33 | $33.33 | 33.33% Markup |
| 30% Target Margin | $142.86 | $42.86 | 42.86% Markup |
| 40% Target Margin | $166.67 | $66.67 | 66.67% Markup |
| 50% Target Margin (Keystone) | $200.00 | $100.00 | 100.00% Markup |
| 60% Target Margin | $250.00 | $150.00 | 150.00% Markup |
Spreadsheet Formulas for Excel and Google Sheets
Automate your inventory pricing calculations across large product catalogues using these spreadsheet formulas:
Directly outputs the exact selling price needed to hit your margin target:
=A2/(1-(B2/100))
Finds the cost markup percentage equivalent to your target profit margin:
=(B2/(100-B2))*100
Calculates the maximum cost price you can pay a supplier while keeping your margin intact:
=A2*(1-(B2/100))
How to Factor Marketplace Fees and Shipping into Reverse Pricing
When selling on platforms like OnBuy, Amazon, or eBay, calculating your selling price using wholesale cost alone will erode your margins. To protect profitability, combine all direct variable costs before applying the reverse margin formula:
- Supplier Buy Cost: Wholesale cost of the item
- Inbound Freight & Customs: Cost to receive or import inventory
- Packaging & Labeling: Boxes, mailers, poly bags, tape, and void fill
- Outbound Postage / Courier Cost: Shipping cost paid to courier services
- Platform Commission %: Category selling fee percentage (e.g. 15% OnBuy/Amazon fee)
Formula for Marketplace Sellers: Total Target Price = (Product Cost + Packaging + Shipping) / [1 - (Target Margin % + Platform Fee %)]
Frequently Asked Questions About Reverse Margin Calculations
What is the difference between pricing with markup vs. pricing with margin?
Pricing with markup adds a percentage on top of your buy cost, which can leave you short of your target profit. Pricing with reverse margin divides your cost by your remaining revenue percentage, guaranteeing that your final margin matches your target.
Can I calculate the maximum allowable supplier cost with this method?
Yes. If the competitive market price for an item is fixed at $50 and your business requires a 30% margin, multiply $50 by (1 – 0.30) to find your maximum allowable cost: $35.00. If a supplier charges more than $35.00, the product will not meet your margin threshold.
Why does a 50% profit margin require a 100% markup?
Because profit margin is calculated against the selling price while markup is calculated against cost. If a product costs $50 and sells for $100, the $50 profit is 50% of the $100 selling price, but 100% of the original $50 cost.