Net Profit = Selling Price - Total Costs

Where Total Costs = Product Cost + All Amazon Fees + Other Costs

Profit Margin % = (Net Profit / Selling Price) × 100

Example: If profit is $5 and selling price is $25, margin = (5/25) × 100 = 20%

ROI % = (Net Profit / Total Investment) × 100

Total Investment includes product cost, fees, and all other costs

Break-Even Price = Total Costs per Unit

The minimum price at which you neither profit nor lose money

Target Price = Total Costs / (1 - Target Margin %)

Example: If costs are $10 and you want 30% margin, price = 10 / (1 - 0.30) = $14.29

Referral Fee = Selling Price × Referral Fee %

Minimum referral fee is $0.30 per item

Storage Fee = (Length × Width × Height / 1728) × Storage Rate × Months

Dimensions in inches, divided by 1728 to get cubic feet

Total Cost = Product Cost + Referral Fee + FBA Fee + Storage Fee + Shipping + Packaging + Advertising + Other Costs