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Price Elasticity of Demand Calculator
Price Elasticity: —
const oldPrice = document.getElementById(“oldPrice”);
const newPrice = document.getElementById(“newPrice”);
const oldQty = document.getElementById(“oldQty”);
const newQty = document.getElementById(“newQty”);
const result = document.getElementById(“result”);
function calculatePED() {
const p1 = parseFloat(oldPrice.value) || 0;
const p2 = parseFloat(newPrice.value) || 0;
const q1 = parseFloat(oldQty.value) || 0;
const q2 = parseFloat(newQty.value) || 0;
if (p1 > 0 && p2 > 0 && q1 > 0 && q2 > 0) {
const priceChange = ((p2 – p1) / p1) * 100;
const qtyChange = ((q2 – q1) / q1) * 100;
const elasticity = qtyChange / priceChange;
result.textContent = `Price Elasticity: ${elasticity.toFixed(2)}`;
} else {
result.textContent = “Price Elasticity: —”;
}
}
// Event listeners for real-time calculation + Google event tracking
document.getElementById(“pedForm”).addEventListener(“input”, (e) => {
calculatePED();
// Google Analytics event tracking
if (typeof gtag === “function”) {
gtag(‘event’, ‘input_change’, {
‘event_category’: ‘PED Calculator’,
‘event_label’: e.target.id
});
}
});
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