Selling on Amazon via Fulfillment by Amazon (FBA) is an excellent way to scale, but understanding your margins is critical to success. This Amazon FBA calculator helps you strip away the mystery of referral fees, storage costs, and fulfillment charges.
How This Calculator Works
Our tool uses the standard Amazon Fee structure to estimate your take-home pay:
Referral Fee: This is essentially a commission Amazon takes for the sale. Most categories are 15%, but some vary from 8% to 45%.
FBA Fulfillment Fee: This covers the cost of picking, packing, and shipping your product. It is determined by the size and "outbound shipping weight" of the product.
Storage Fee: Amazon charges for the space your inventory occupies in their fulfillment centers, calculated by cubic foot.
Real-World Example
Let's say you are selling a Yoga Mat for $35.00.
COGS: $10.00
Shipping to Warehouse: $1.50
Referral Fee (15%): $5.25
Fulfillment Fee (Large Standard): Approx. $6.50
Storage (1 month): $0.20
In this scenario, your total fees would be $11.95. Subtracting your costs ($11.50) and fees from the sale price leaves you with a Net Profit of $11.55 and a 33% profit margin.
FBA Success Tips
To maximize your Amazon FBA profit, consider reducing your packaging size. Even a half-inch reduction in height can sometimes move your product from "Large Standard" to "Small Standard" tier, saving you dollars per unit in fulfillment fees. Additionally, watch your inventory turnover; high storage fees during Q4 (October – December) can quickly eat away at your margins.
function calculateFBAProfit() {
// Inputs
var salePrice = parseFloat(document.getElementById('salePrice').value) || 0;
var costOfGoods = parseFloat(document.getElementById('costOfGoods').value) || 0;
var shippingToAmazon = parseFloat(document.getElementById('shippingToAmazon').value) || 0;
var weight = parseFloat(document.getElementById('unitWeight').value) || 0;
var L = parseFloat(document.getElementById('length').value) || 0;
var W = parseFloat(document.getElementById('width').value) || 0;
var H = parseFloat(document.getElementById('height').value) || 0;
var refRate = parseFloat(document.getElementById('referralRate').value) || 0.15;
if (salePrice <= 0) {
alert("Please enter a valid Sale Price");
return;
}
// 1. Referral Fee
var referralFee = salePrice * refRate;
if (referralFee 15 || W > 12 || H > 0.75);
if (!isLarge && weight <= 0.5) {
fulfillmentFee = 3.22; // Small Standard
} else if (weight <= 0.5) {
fulfillmentFee = 3.86; // Large Standard < 0.5lb
} else if (weight <= 1) {
fulfillmentFee = 4.08;
} else if (weight <= 2) {
fulfillmentFee = 4.75;
} else if (weight 0 ? '#2e7d32' : '#d32f2f';
document.getElementById('outMargin').innerHTML = 'Margin: ' + margin.toFixed(2) + '%';
// Smooth scroll to results
document.getElementById('resultsArea').scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}