Drywall Weight and Load Calculator
ANA›Life Services Authority›National Calculator Authority›Drywall Weight and Load Calculator
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Drywall Weight and Load Calculator
Calculate the total weight of drywall sheets and the distributed load per square foot for structural planning and material estimation.
Sheet Length (ft)
Sheet Width (ft)
Thickness
1/4 inch (0.25 in) — ~1.2 lb/ft² 3/8 inch (0.375 in) — ~1.4 lb/ft² 1/2 inch (0.5 in) — ~2.0 lb/ft² 5/8 inch (0.625 in) — ~2.5 lb/ft²
Number of Sheets
Number of Layers
Total Coverage Area (ft²) optional — overrides sheets × length × width
Calculate
function dryCalc() { var length = parseFloat(document.getElementById('dry-length').value); var width = parseFloat(document.getElementById('dry-width').value); var thick = parseFloat(document.getElementById('dry-thickness').value); var sheets = parseFloat(document.getElementById('dry-sheets').value); var layers = parseFloat(document.getElementById('dry-layers').value); var areaIn = document.getElementById('dry-area').value; var resultEl = document.getElementById('dry-result');
// --- Validation --- var errors = []; if (isNaN(length) || length 20) errors.push("Sheet length must be between 1 and 20 ft."); if (isNaN(width) || width 10) errors.push("Sheet width must be between 1 and 10 ft."); if (isNaN(sheets) || sheets 10000) errors.push("Number of sheets must be between 1 and 10,000."); if (isNaN(layers) || layers 5) errors.push("Layers must be between 1 and 5."); if (areaIn !== "" && (isNaN(parseFloat(areaIn)) || parseFloat(areaIn) 0) { resultEl.style.display = "block"; resultEl.innerHTML = "⚠ " + errors.join("⚠ ") + ""; return; }
// --- Weight per ft² lookup (lb/ft²) based on standard gypsum board density ~100 lb/ft³ --- // Standard values per GA-216 / USG references: // 1/4" → 1.2 lb/ft² // 3/8" → 1.4 lb/ft² // 1/2" → 2.0 lb/ft² // 5/8" → 2.5 lb/ft² var weightPerSqFtMap = { "0.25": 1.2, "0.375": 1.4, "0.5": 2.0, "0.625": 2.5 }; var weightPerSqFt = weightPerSqFtMap[String(thick)];
- // --- Area calculation ---
- var sheetArea = length * width; // ft² per sheet
- var totalArea = (areaIn !== "" && parseFloat(areaIn) > 0)
- ? parseFloat(areaIn)
- sheets * sheetArea; // ft² total (single layer) var coveredArea = totalArea * layers; // ft² accounting for layers
// --- Weight calculations --- var weightPerSheet = sheetArea * weightPerSqFt; // lb per sheet (single layer) var totalWeight = coveredArea * weightPerSqFt; // lb total var totalWeightKg = totalWeight * 0.453592; // kg var loadPerSqFt = weightPerSqFt * layers; // lb/ft² distributed load var loadPerSqM = loadPerSqFt * 4.88243; // kg/m²
// --- Sheets needed (if area was manually entered) --- var sheetsNeeded = Math.ceil(totalArea / sheetArea);
// --- Format helpers --- function fmt(n, d) { return n.toLocaleString('en-US', {minimumFractionDigits: d, maximumFractionDigits: d}); }
var thickLabel = document.getElementById('dry-thickness').options[document.getElementById('dry-thickness').selectedIndex].text.split('—')[0].trim(); var areaSource = (areaIn !== "" && parseFloat(areaIn) > 0) ? "manual entry" : sheets + " sheets × " + fmt(sheetArea,1) + " ft²/sheet";
resultEl.style.display = "block"; resultEl.innerHTML = "### Results " + "" + "Thickness Selected" + thickLabel + "" + "Weight per ft²" + fmt(weightPerSqFt,2) + " lb/ft²" + "Weight per Sheet" + fmt(weightPerSheet,1) + " lb (" + fmt(weightPerSheet0.453592,1) + " kg)" + "Total Coverage Area" + fmt(totalArea,1) + " ft² (" + areaSource + ")" + "Sheets Needed" + sheetsNeeded + " sheets" + "Number of Layers" + layers + "" + "Total Drywall Weight" + fmt(totalWeight,1) + " lb* (" + fmt(totalWeightKg,1) + " kg)" + "Distributed Load**" + fmt(loadPerSqFt,2) + " lb/ft² (" + fmt(loadPerSqM,2) + " kg/m²)" + ""; }
#### Formulas Used
Sheet Area: Asheet = Length × Width (ft²)
Total Area: Atotal = Number of Sheets × Asheet (or manually entered)
Weight per Sheet: Wsheet = Asheet × wpsf (lb)
Total Weight: Wtotal = Atotal × Layers × wpsf (lb)
Distributed Load: L = wpsf × Layers (lb/ft²)
Where wpsf is the standard weight per square foot for the selected thickness (see table below).
Thicknesswpsf (lb/ft²) 1/4 in1.2 3/8 in1.4 1/2 in2.0 5/8 in2.5
#### Assumptions & References
- Weight-per-square-foot values are based on standard gypsum board (Type X and regular) per USG Corporation product data and GA-216 (Gypsum Association) specifications.
- Gypsum board density is approximately 100 lb/ft³; actual product weights may vary ±5–10% by manufacturer.
- The distributed load calculation assumes drywall is the only dead load component; structural engineers must add framing, insulation, and other dead/live loads per ASCE 7.
- Typical ceiling dead load allowance for drywall is 5–10 lb/ft² total; single-layer ½ in drywall contributes ~2.0 lb/ft².
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