Success on Amazon hinges on accurate math. While many sellers focus solely on the "Best Seller Rank" (BSR), the most critical metric is your net profit after all Amazon-specific deductions. This Amazon FBA Profit Calculator helps you visualize your actual earnings before you even source a product.
Key Components of the Calculation
Referral Fee: This is Amazon's commission for selling on their platform, typically 15% for most categories.
Fulfillment Fee (FBA): The flat fee charged by Amazon to pick, pack, and ship your item to the customer. This depends on the size and weight of the product.
COGS (Cost of Goods Sold): The total price you pay your manufacturer per unit.
Shipping to Amazon: Often overlooked, this is the freight cost to move your inventory from your factory or home to Amazon's fulfillment centers.
A healthy FBA business typically aims for a 25-30% net profit margin. This provides enough buffer for PPC (advertising) spend and unexpected returns.
How does shipping weight affect profit?
Amazon determines FBA fees based on the greater of actual weight or dimensional weight. Heavy or bulky items can quickly become unprofitable due to high fulfillment fees.
function calculateFBAProfit() {
var sale = parseFloat(document.getElementById('salePrice').value) || 0;
var cogs = parseFloat(document.getElementById('unitCost').value) || 0;
var shipToAmz = parseFloat(document.getElementById('shippingCost').value) || 0;
var fbaFee = parseFloat(document.getElementById('fulfillmentFee').value) || 0;
var refPercent = parseFloat(document.getElementById('referralFee').value) || 0;
var other = parseFloat(document.getElementById('otherFees').value) || 0;
if (sale 0) ? (netProfit / (cogs + shipToAmz)) * 100 : 0;
// Break-even calculation (Price where profit is 0)
// Formula: X – (X * ref%) – fba – other – cogs – ship = 0
// X(1 – ref%) = fba + other + cogs + ship
var breakEven = (fbaFee + other + cogs + shipToAmz) / (1 – (refPercent / 100));
// Display Results
document.getElementById('fba-results').style.display = 'block';
document.getElementById('resProfit').innerHTML = '$' + netProfit.toFixed(2);
document.getElementById('resMargin').innerHTML = margin.toFixed(1) + '%';
document.getElementById('resROI').innerHTML = roi.toFixed(1) + '%';
document.getElementById('resTotalFees').innerHTML = '$' + totalFees.toFixed(2);
document.getElementById('resBreakEven').innerHTML = '$' + breakEven.toFixed(2);
// Color logic
var resultColor = (netProfit > 0) ? '#2ecc71' : '#e74c3c';
document.getElementById('resProfit').style.color = resultColor;
document.getElementById('resMargin').style.color = resultColor;
document.getElementById('resROI').style.color = resultColor;
}