Calculate your Net Margin Rate, ROI, and Total Fees for FBA/FBM products.
$
$
$
%
Typically 8% to 15% depending on category.
$
$
Revenue:$0.00
Total Amazon Fees:$0.00
Total Product Costs:$0.00
Net Profit:$0.00
Net Margin Rate:0.00%
ROI Rate:0.00%
Break-even Price:$0.00
Understanding Amazon Seller Rates
Success on Amazon isn't just about revenue; it is about understanding your profitability rates. The Amazon Seller Rate Calculator helps FBA (Fulfillment by Amazon) and FBM (Fulfillment by Merchant) sellers determine the true viability of a product by breaking down fees relative to the selling price.
Key Metrics Calculated
Referral Fee Rate: This is the commission Amazon takes for every item sold. It is usually calculated as a percentage of the total sales price (including shipping charged to the customer). Most categories fall between 8% and 15%.
Net Margin Rate: This is arguably your most critical metric. It represents the percentage of revenue that remains as profit after all costs (COGS, shipping, FBA fees, and referral fees) are deducted. A healthy margin rate for private label products is typically between 15% and 30%.
Return on Investment (ROI) Rate: While margin looks at profit relative to price, ROI looks at profit relative to your investment (cost of goods). A 100% ROI means you have doubled your money.
How to Use This Calculator
Selling Price: Enter the price the customer pays on Amazon.
Cost of Goods Sold (COGS): Enter your manufacturing or sourcing cost per unit.
Shipping to Amazon: Calculate your inbound shipping cost (e.g., freight from China to Amazon Warehouse) divided by the number of units.
Referral Fee Rate: Input the percentage charged by Amazon for your specific category (e.g., Electronics is often 8%, Home & Kitchen 15%).
FBA Fulfillment Fee: This is a fixed dollar amount based on the weight and dimensions of your packaged product.
Why "Seller Rate" Matters
Many new sellers focus on the dollar amount of profit, but the rate is a better indicator of business health. If you make $5 profit on a $100 item, your margin rate is only 5%. This leaves very little room for advertising costs (PPC), returns, or price fluctuations. By monitoring your Net Margin Rate and ROI Rate, you can ensure your Amazon business remains sustainable in the long term.
function calculateSellerRates() {
// 1. Get Input Values
var salePrice = parseFloat(document.getElementById("salePrice").value);
var productCost = parseFloat(document.getElementById("productCost").value);
var shipToAmz = parseFloat(document.getElementById("shipToAmz").value);
var referralRate = parseFloat(document.getElementById("referralRate").value);
var fbaFee = parseFloat(document.getElementById("fbaFee").value);
var miscCost = parseFloat(document.getElementById("miscCost").value);
// 2. Validate Inputs (Treat empty as 0, except Sale Price which is required for meaningful calc)
if (isNaN(salePrice) || salePrice 0) {
roiRate = (netProfit / landedCost) * 100;
}
// Break Even Price
// SalePrice – (SalePrice * RefRate) – FixedCosts = 0
// SalePrice * (1 – RefRate) = FixedCosts
// SalePrice = FixedCosts / (1 – RefRate)
var fixedCostsPerUnit = landedCost + fbaFee;
var refRateDecimal = referralRate / 100;
var breakEven = 0;
if (refRateDecimal = 0) {
profitEl.style.color = "#28a745";
} else {
profitEl.style.color = "#dc3545";
}
document.getElementById("displayMargin").innerHTML = marginRate.toFixed(2) + "%";
document.getElementById("displayROI").innerHTML = roiRate.toFixed(2) + "%";
document.getElementById("displayBreakEven").innerHTML = "$" + breakEven.toFixed(2);
// Status Badge Logic
var badgeHtml = "";
if (marginRate >= 25) {
badgeHtml = "Excellent Margin Rate";
} else if (marginRate >= 15) {
badgeHtml = "Average Margin Rate";
} else if (marginRate > 0) {
badgeHtml = "Low Margin Rate";
} else {
badgeHtml = "Loss Making";
}
document.getElementById("statusBadge").innerHTML = badgeHtml;
// Show Results
document.getElementById("resultArea").style.display = "block";
}