function calculateFBAProfit() {
var salePrice = parseFloat(document.getElementById('fba_sale_price').value) || 0;
var cogs = parseFloat(document.getElementById('fba_cogs').value) || 0;
var shipToAmz = parseFloat(document.getElementById('fba_ship_to_amz').value) || 0;
var refPercent = parseFloat(document.getElementById('fba_ref_fee').value) || 0;
var fulfillment = parseFloat(document.getElementById('fba_ful_fee').value) || 0;
var storage = parseFloat(document.getElementById('fba_storage').value) || 0;
var referralFee = salePrice * (refPercent / 100);
var totalFees = referralFee + fulfillment + storage + shipToAmz;
var netProfit = salePrice – cogs – totalFees;
var margin = 0;
if (salePrice > 0) {
margin = (netProfit / salePrice) * 100;
}
var roi = 0;
var totalInvestment = cogs + shipToAmz;
if (totalInvestment > 0) {
roi = (netProfit / totalInvestment) * 100;
}
document.getElementById('fba_res_profit').innerHTML = "$" + netProfit.toFixed(2);
document.getElementById('fba_res_margin').innerHTML = margin.toFixed(2) + "%";
document.getElementById('fba_res_roi').innerHTML = roi.toFixed(2) + "%";
if (netProfit < 0) {
document.getElementById('fba_res_profit').style.color = "#d32f2f";
} else {
document.getElementById('fba_res_profit').style.color = "#2e7d32";
}
}
How to Use the Amazon FBA Profit Calculator
Success on Amazon depends on understanding your "true" net margin. Many sellers focus on revenue, but Amazon's complex fee structure can quickly erode profits. This calculator helps you break down every expense to ensure your private label or wholesale business remains sustainable.
Key Components of FBA Profitability
To get an accurate result, you must input values for the following categories:
Cost of Goods Sold (COGS): The manufacturing cost per unit plus any inspection fees.
Referral Fees: This is the commission Amazon takes for selling on their platform. For most categories, this is 15%, but it ranges from 8% to 45%.
Fulfillment Fees: These are the "Pick & Pack" fees based on the weight and dimensions of your product.
Shipping to Amazon: Don't forget the cost of freight or small parcel delivery (SPD) to get your items into the FBA warehouse.
Amazon FBA Fee Reference Table
Category
Typical Referral Fee
Standard Size FBA Fee
Home & Kitchen
15%
$3.22 – $6.00+
Clothing & Accessories
17%
$3.43 – $7.00+
Electronics
8%
$3.22 – $5.50+
Profit Margin vs. ROI: What's the Difference?
In our calculator, we provide both Profit Margin and Return on Investment (ROI). It is vital to understand the difference:
Profit Margin tells you how much of every dollar in sales you keep as profit. For example, a 20% margin means you keep $0.20 for every $1.00 in revenue. Most successful FBA sellers aim for a margin of at least 25% to cover PPC advertising costs.
ROI (Return on Investment) tells you how hard your money is working for you. If you spend $10.00 to buy and ship a product and you make $10.00 in profit, your ROI is 100%. Experienced sellers often look for an ROI of 100% or higher to ensure they have enough cash flow to reinvest in more inventory.
Common "Hidden" Fees to Watch Out For
While this calculator covers the primary costs, seasoned sellers should also keep an eye on:
Advertising (PPC): This is often the largest expense after COGS and FBA fees.
Returns & Dispositions: Amazon charges fees to return items to you or dispose of unsellable stock.
Long-Term Storage: Inventory sitting in a warehouse for more than 365 days incurs significantly higher monthly charges.