Understanding your numbers is the difference between a successful Amazon business and a failing one. This Amazon FBA Profit Calculator helps you determine the exact net profit, profit margin, and return on investment (ROI) for any private label or wholesale product after all Amazon-specific fees are deducted.
Key Components of the Calculation:
Selling Price: The final price the customer pays on the Amazon marketplace.
COGS (Cost of Goods Sold): The price you pay the manufacturer per unit.
Referral Fee: Amazon's "commission" for selling on their platform (usually 15% for most categories).
FBA Fulfillment Fee: The flat fee per unit that covers picking, packing, and shipping to the customer.
ROI: Calculated as (Net Profit / Product Cost) * 100. This tells you how much money you make relative to what you spent on inventory.
Real-World Profit Example:
Suppose you source a kitchen gadget for $8.50 and sell it for $29.99.
Your 15% referral fee would be $4.50. If the FBA fee is $5.40 and shipping to Amazon costs $1.20 per unit, your total expenses before PPC are approximately $20.10.
This leaves you with a $9.89 profit per unit, representing a 33% margin and 116% ROI.
function calculateFBA() {
// Get values from inputs
var sellingPrice = parseFloat(document.getElementById('sellingPrice').value) || 0;
var productCost = parseFloat(document.getElementById('productCost').value) || 0;
var shippingToAmazon = parseFloat(document.getElementById('shippingToAmazon').value) || 0;
var referralFeeRate = parseFloat(document.getElementById('referralFeeRate').value) || 0;
var fbaFee = parseFloat(document.getElementById('fbaFee').value) || 0;
var otherCosts = parseFloat(document.getElementById('otherCosts').value) || 0;
// Logic for referral fee
var referralFeeAmount = (sellingPrice * (referralFeeRate / 100));
// Total Fees charged by Amazon
var totalAmazonFees = referralFeeAmount + fbaFee;
// Total Expenses
var totalExpenses = productCost + shippingToAmazon + totalAmazonFees + otherCosts;
// Net Profit
var netProfit = sellingPrice – totalExpenses;
// Profit Margin (Profit / Selling Price)
var margin = (sellingPrice > 0) ? (netProfit / sellingPrice) * 100 : 0;
// ROI (Profit / Product Cost)
var roi = (productCost > 0) ? (netProfit / productCost) * 100 : 0;
// Update UI
document.getElementById('netProfitDisplay').innerText = '$' + netProfit.toFixed(2);
document.getElementById('marginDisplay').innerText = margin.toFixed(2) + '%';
document.getElementById('roiDisplay').innerText = roi.toFixed(2) + '%';
document.getElementById('totalFeesDisplay').innerText = '$' + totalAmazonFees.toFixed(2);
document.getElementById('totalExpensesDisplay').innerText = '$' + totalExpenses.toFixed(2);
// Color coding for profit
var profitElement = document.getElementById('netProfitDisplay');
if (netProfit > 0) {
profitElement.style.color = "#2e7d32";
} else {
profitElement.style.color = "#d32f2f";
}
// Show the results box
document.getElementById('results-box').style.display = 'block';
}