*For hollow core doors, calculations are estimates based on average frame/skin density.
Estimated Door Weight
0 kg
0 lbs
Loading automation class…
Why Calculate Door Weight for Auto Openers?
Whether you are installing an automatic swing door operator for a commercial building or retrofitting a car door, knowing the precise weight is critical for safety and functionality. Under-specifying hardware can lead to motor burnout, hinge failure, or dangerous closing speeds.
How It Is Calculated
This calculator uses the volumetric formula combined with specific material densities. The basic logic is:
Volume = Height × Width × Thickness
Weight = Volume × Material Density
Common Material Densities Used
Material
Density (kg/m³)
Common Usage
Tempered Glass
2500
Storefronts, Showers
Steel
7850
Security Doors, Auto Body
Solid Oak
750
Exterior Residential
Pine
500
Interior Doors
Automation Classes
Automatic door operators are rated by weight capacity:
Low Duty: Doors under 50kg (110lbs)
Medium Duty: Doors up to 100kg (220lbs)
Heavy Duty: Doors over 150kg (330lbs)
function updateLabels() {
var unit = document.getElementById("dwc-unit").value;
var hLabel = document.getElementById("lbl-height");
var wLabel = document.getElementById("lbl-width");
var tLabel = document.getElementById("lbl-thickness");
var hInput = document.getElementById("dwc-height");
var wInput = document.getElementById("dwc-width");
var tInput = document.getElementById("dwc-thickness");
if (unit === "imperial") {
hLabel.innerText = "Height (Inches)";
wLabel.innerText = "Width (Inches)";
tLabel.innerText = "Thickness (Inches)";
hInput.placeholder = "e.g., 84";
wInput.placeholder = "e.g., 36";
tInput.placeholder = "e.g., 1.75";
} else {
hLabel.innerText = "Height (mm)";
wLabel.innerText = "Width (mm)";
tLabel.innerText = "Thickness (mm)";
hInput.placeholder = "e.g., 2100";
wInput.placeholder = "e.g., 900";
tInput.placeholder = "e.g., 40";
}
}
function calculateDoorWeight() {
// Get Input Values
var unit = document.getElementById("dwc-unit").value;
var height = parseFloat(document.getElementById("dwc-height").value);
var width = parseFloat(document.getElementById("dwc-width").value);
var thickness = parseFloat(document.getElementById("dwc-thickness").value);
var density = parseFloat(document.getElementById("dwc-material").value);
// Validation
if (isNaN(height) || isNaN(width) || isNaN(thickness)) {
alert("Please enter valid numbers for all dimensions.");
return;
}
var volumeM3 = 0;
// Convert dimensions to Meters (m) to calculate Volume in m³
// Density is in kg/m³
if (unit === "imperial") {
// Inputs are in inches. 1 inch = 0.0254 meters
var hM = height * 0.0254;
var wM = width * 0.0254;
var tM = thickness * 0.0254;
volumeM3 = hM * wM * tM;
} else {
// Inputs are in mm. 1 mm = 0.001 meters
var hM = height / 1000;
var wM = width / 1000;
var tM = thickness / 1000;
volumeM3 = hM * wM * tM;
}
// Calculate Weight
var weightKg = volumeM3 * density;
var weightLbs = weightKg * 2.20462;
// Determine Automation Class
var autoClass = "";
if (weightKg < 50) {
autoClass = "Suitable for Low Duty Automatic Operators";
} else if (weightKg < 120) {
autoClass = "Requires Medium Duty Automatic Operator";
} else {
autoClass = "Requires Heavy Duty / Industrial Automatic Operator";
}
// Display Results
var resultBox = document.getElementById("dwc-result");
var resKg = document.getElementById("res-kg");
var resLbs = document.getElementById("res-lbs");
var resAuto = document.getElementById("res-automation");
resKg.innerText = weightKg.toFixed(2) + " kg";
resLbs.innerText = weightLbs.toFixed(2) + " lbs";
resAuto.innerText = "Automation Recommendation: " + autoClass;
resultBox.style.display = "block";
}