The Equivalent Monetary Ratio (EMR) is a financial metric used to compare different investment or spending opportunities by standardizing their value over a specific period, often a year. It helps in making informed decisions by understanding the true cost or return of an option, especially when initial costs or benefits differ significantly from ongoing ones.
EMR Result:
function calculateEMR() {
var initialCost = parseFloat(document.getElementById("initialCost").value);
var annualCost = parseFloat(document.getElementById("annualCost").value);
var timePeriodYears = parseInt(document.getElementById("timePeriodYears").value);
var discountRate = parseFloat(document.getElementById("discountRate").value) / 100; // Convert percentage to decimal
var emrValueElement = document.getElementById("emrValue");
if (isNaN(initialCost) || isNaN(annualCost) || isNaN(timePeriodYears) || isNaN(discountRate)) {
emrValueElement.innerHTML = "Please enter valid numbers for all fields.";
return;
}
if (initialCost < 0 || annualCost < 0 || timePeriodYears <= 0 || discountRate < 0) {
emrValueElement.innerHTML = "Please enter positive values for costs and time period, and a non-negative discount rate.";
return;
}
var presentValueAnnualCosts = 0;
for (var i = 1; i <= timePeriodYears; i++) {
presentValueAnnualCosts += annualCost / Math.pow((1 + discountRate), i);
}
var totalPresentValue = initialCost + presentValueAnnualCosts;
var emr = totalPresentValue / timePeriodYears;
emrValueElement.innerHTML = "$" + emr.toFixed(2) + " per year";
}
#emr-calculator {
font-family: sans-serif;
max-width: 500px;
margin: 20px auto;
padding: 20px;
border: 1px solid #ccc;
border-radius: 8px;
}
.calculator-input {
margin-bottom: 15px;
}
.calculator-input label {
display: block;
margin-bottom: 5px;
font-weight: bold;
}
.calculator-input input {
width: calc(100% – 10px);
padding: 8px;
border: 1px solid #ccc;
border-radius: 4px;
}
#emr-calculator button {
display: block;
width: 100%;
padding: 10px;
background-color: #007bff;
color: white;
border: none;
border-radius: 4px;
cursor: pointer;
font-size: 16px;
margin-top: 10px;
}
#emr-calculator button:hover {
background-color: #0056b3;
}
#result {
margin-top: 20px;
padding-top: 15px;
border-top: 1px solid #eee;
}
#result h3 {
margin-bottom: 10px;
}
#emrValue {
font-size: 1.2em;
font-weight: bold;
color: #28a745;
}