function updateRoi() {
var visitors = parseInt(document.getElementById(“visitors-slider”).value);
var cvr = parseFloat(document.getElementById(“cvr-slider”).value);
var aov = parseInt(document.getElementById(“aov-slider”).value);

document.getElementById(“visitors-val”).innerText = visitors.toLocaleString(“en-IN”);
document.getElementById(“cvr-val”).innerText = cvr.toFixed(1) + “%”;
document.getElementById(“aov-val”).innerText = “₹” + aov.toLocaleString(“en-IN”);

var currentLeads = visitors * (cvr / 100);
var currentMonthlyRev = Math.round(currentLeads * aov);

var projectedVisitors = visitors * 3;
var projectedLeads = projectedVisitors * (cvr / 100);
var projectedMonthlyRev = Math.round(projectedLeads * aov);

var monthlyGain = projectedMonthlyRev – currentMonthlyRev;
var annualGain = monthlyGain * 12;

document.getElementById(“current-rev-display”).innerText = “₹” + currentMonthlyRev.toLocaleString(“en-IN”);
document.getElementById(“projected-rev-display”).innerText = “₹” + projectedMonthlyRev.toLocaleString(“en-IN”);

var annualGainFormatted = “”;
if (annualGain >= 10000000) {
annualGainFormatted = “+₹” + (annualGain / 10000000).toFixed(2) + ” Cr / Year”;
} else if (annualGain >= 100000) {
annualGainFormatted = “+₹” + (annualGain / 100000).toFixed(2) + ” Lakh / Year”;
} else {
annualGainFormatted = “+₹” + annualGain.toLocaleString(“en-IN”) + ” / Year”;
}
document.getElementById(“annual-gain-display”).innerText = annualGainFormatted;

var waMsg = “Hi MeraSEO, I used your SEO ROI Calculator:n” +
“• Current Visitors: ” + visitors.toLocaleString(“en-IN”) + “/mon” +
“• Conversion Rate: ” + cvr.toFixed(1) + “%n” +
“• Average Deal Size: ₹” + aov.toLocaleString(“en-IN”) + “n” +
“• Target Projected Gain: ” + annualGainFormatted + “n” +
“I would like to discuss an SEO strategy for my business.”;
document.getElementById(“roi-whatsapp-btn”).href = “https://wa.me/919167117772?text=” + encodeURIComponent(waMsg);
}