Calculate your net margins, ROI, and total Amazon fees accurately.
Total Amazon Fees:$0.00
Net Profit (Per Unit):$0.00
Profit Margin:0.00%
Return on Investment (ROI):0.00%
How to Calculate Your Amazon FBA Profit
Selling on Amazon FBA (Fulfillment by Amazon) is a lucrative business model, but understanding your true margins is critical for success. Many sellers focus only on the selling price and ignore the hidden fees that eat into their bottom line.
Core Components of FBA Math
COGS (Cost of Goods Sold): This is the manufacturing or wholesale cost of your product.
Referral Fee: Amazon's "commission" for selling on their platform, typically 15% for most categories.
Fulfillment Fee: The cost for Amazon to pick, pack, and ship your item to the customer.
PPC/Marketing: The amount spent on Amazon Advertising to generate a single sale.
Example Profit Scenario
Expense Type
Standard Item
Oversize Item
Selling Price
$25.00
$85.00
COGS
$5.00
$22.00
Amazon Fees
$8.50
$19.00
Net Profit
$11.50
$44.00
Optimizing Your Margins
To increase your profit, consider reducing your packaging size to fit into a lower FBA fee tier. Additionally, monitoring your ACOS (Advertising Cost of Sales) is vital. If your PPC spend exceeds your profit margin per unit, you are losing money on every promoted sale.
function calculateFBAProfit() {
// Get values from inputs
var price = parseFloat(document.getElementById('sellingPrice').value) || 0;
var cogs = parseFloat(document.getElementById('cogs').value) || 0;
var shipping = parseFloat(document.getElementById('shippingToAmazon').value) || 0;
var referralPercent = parseFloat(document.getElementById('referralFee').value) || 0;
var fbaFee = parseFloat(document.getElementById('fbaFee').value) || 0;
var storage = parseFloat(document.getElementById('storageFee').value) || 0;
var ppc = parseFloat(document.getElementById('ppcCost').value) || 0;
var returns = parseFloat(document.getElementById('returnRate').value) || 0;
if (price = 0 ? "result-value profit-positive" : "result-value profit-negative";
document.getElementById('resMargin').innerText = margin.toFixed(2) + "%";
document.getElementById('resROI').innerText = roi.toFixed(2) + "%";
// Show results container
document.getElementById('fbaResults').style.display = "block";
}