Calculate Donor Attrition Rate
This article will guide you through understanding and calculating donor attrition rate, a crucial metric for non-profit organizations. Donor attrition refers to the loss of donors over a specific period. A high attrition rate can significantly impact an organization's fundraising efforts and financial stability. Understanding why donors leave and implementing strategies to retain them is vital for long-term success.
The donor attrition rate is calculated as the percentage of donors who stop giving to your organization within a given timeframe, typically a year.
**Formula:**
Donor Attrition Rate = (Number of Donors Lost / Total Number of Donors at the Beginning of the Period) * 100
Let's break down the components:
* **Number of Donors Lost:** This is the count of individuals or entities who donated in a previous period but did not donate in the current period.
* **Total Number of Donors at the Beginning of the Period:** This is the total number of active donors you had at the start of the timeframe you are analyzing.
Here's a calculator to help you compute your donor attrition rate:
function calculateAttritionRate() {
var donorsLostInput = document.getElementById("donorsLost");
var totalBeginningDonorsInput = document.getElementById("totalBeginningDonors");
var resultDiv = document.getElementById("result");
var donorsLost = parseFloat(donorsLostInput.value);
var totalBeginningDonors = parseFloat(totalBeginningDonorsInput.value);
if (isNaN(donorsLost) || isNaN(totalBeginningDonors) || donorsLost < 0 || totalBeginningDonors < 0) {
resultDiv.innerHTML = "Please enter valid non-negative numbers for all fields.";
return;
}
if (totalBeginningDonors === 0) {
resultDiv.innerHTML = "Total donors at the start cannot be zero.";
return;
}
var attritionRate = (donorsLost / totalBeginningDonors) * 100;
resultDiv.innerHTML = "Your Donor Attrition Rate is: " + attritionRate.toFixed(2) + "%";
}
.calculator-widget {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 400px;
margin: 20px auto;
box-shadow: 2px 2px 10px rgba(0,0,0,0.1);
}
.calculator-widget h2 {
text-align: center;
margin-bottom: 20px;
color: #333;
}
.input-group {
margin-bottom: 15px;
}
.input-group label {
display: block;
margin-bottom: 5px;
font-weight: bold;
color: #555;
}
.input-group input[type="number"] {
width: calc(100% – 12px);
padding: 8px;
border: 1px solid #ddd;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
.calculator-widget button {
width: 100%;
padding: 10px;
background-color: #4CAF50;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
transition: background-color 0.3s ease;
}
.calculator-widget button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
text-align: center;
font-size: 1.1em;
color: #333;
}