This calculator helps you determine the failure rate of a component or system based on its reliability. Reliability is typically expressed as a probability or percentage of successful operation over a given period. The failure rate is the inverse of reliability, representing how often failures occur.
function calculateFailureRate() {
var reliability = parseFloat(document.getElementById("reliability").value);
var timePeriod = parseFloat(document.getElementById("timePeriod").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
if (isNaN(reliability) || isNaN(timePeriod)) {
resultDiv.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (reliability 1) {
resultDiv.innerHTML = "Reliability must be between 0 and 1.";
return;
}
if (timePeriod <= 0) {
resultDiv.innerHTML = "Time period must be a positive number.";
return;
}
// The failure rate (lambda) is often approximated as (1 – Reliability) / Time Period
// This is a common approximation for low failure rates over a given period.
// More complex models exist for different failure distributions (e.g., exponential, Weibull).
var failureRate = (1 – reliability) / timePeriod;
resultDiv.innerHTML = "Calculated Failure Rate: " + failureRate.toFixed(8) + " failures per unit of time period";
}
.calculator-container {
font-family: sans-serif;
border: 1px solid #ccc;
padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
}
.input-section {
margin-bottom: 15px;
}
.input-section label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.input-section input {
width: calc(100% – 22px); /* Account for padding and border */
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box; /* Include padding and border in the element's total width and height */
}
button {
background-color: #4CAF50;
color: white;
padding: 10px 15px;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
}
button:hover {
background-color: #45a049;
}
#result {
margin-top: 20px;
padding: 15px;
border: 1px solid #eee;
border-radius: 4px;
background-color: #fff;
}