Amazon Sell-Through Rate Calculator
The Sell-Through Rate (STR) is a crucial metric for Amazon sellers, indicating how effectively you are selling your inventory. It measures the percentage of your inventory that has been sold over a specific period. A higher sell-through rate generally signifies healthy inventory management and strong product demand.
To calculate your Sell-Through Rate, you need two key pieces of information:
- Units Sold: The total number of units of a specific product or all products sold within a given timeframe (e.g., a month).
- Beginning Inventory: The number of units you had in stock at the start of that same timeframe.
The formula is:
Sell-Through Rate = (Units Sold / (Units Sold + Remaining Inventory)) * 100
Alternatively, if you know your beginning inventory and units sold, and you want to calculate it based on units sold and units remaining in stock:
Sell-Through Rate = (Units Sold / Beginning Inventory) * 100
(Note: The first formula is more common as it accounts for inventory that didn't sell. We will use the first, more comprehensive formula here, which requires you to input both 'Units Sold' and 'Remaining Inventory'.)
function calculateSellThroughRate() {
var unitsSold = parseFloat(document.getElementById("unitsSold").value);
var remainingInventory = parseFloat(document.getElementById("remainingInventory").value);
var resultDiv = document.getElementById("result");
if (isNaN(unitsSold) || isNaN(remainingInventory) || unitsSold < 0 || remainingInventory < 0) {
resultDiv.innerHTML = "Please enter valid, non-negative numbers for Units Sold and Remaining Inventory.";
return;
}
var totalInventoryAtStart = unitsSold + remainingInventory;
var sellThroughRate = 0;
if (totalInventoryAtStart === 0) {
sellThroughRate = 0; // Or handle as an error/special case if preferred
} else {
sellThroughRate = (unitsSold / totalInventoryAtStart) * 100;
}
resultDiv.innerHTML = "
Your Sell-Through Rate is: " + sellThroughRate.toFixed(2) + "%
";
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 600px;
margin: 20px auto;
background-color: #f9f9f9;
}
.calculator-container h2 {
text-align: center;
margin-bottom: 15px;
color: #333;
}
.calculator-container p {
margin-bottom: 20px;
line-height: 1.6;
color: #555;
}
.calculator-container ul {
margin-left: 20px;
margin-bottom: 15px;
}
.calculator-container li {
margin-bottom: 8px;
color: #555;
}
.calculator-inputs {
display: flex;
flex-direction: column;
gap: 15px;
margin-bottom: 20px;
}
.input-group {
display: flex;
align-items: center;
gap: 10px;
}
.input-group label {
flex: 1;
font-weight: bold;
color: #444;
}
.input-group input {
flex: 2;
padding: 10px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box;
}
.calculator-inputs button {
padding: 12px 20px;
background-color: #FF9900;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
width: 100%;
}
.calculator-inputs button:hover {
background-color: #e08a00;
}
.calculator-result {
margin-top: 20px;
padding: 15px;
background-color: #e8f0fe;
border: 1px solid #a7c7e7;
border-radius: 4px;
text-align: center;
font-size: 18px;
color: #0056b3;
}
.calculator-result h3 {
margin: 0;
}