Coating Calculator

Industrial Coating & Paint Coverage Calculator

Calculation Results

Total Surface Area: 0 sq ft

Total Volume Required: 0 gallons

Recommended Purchase: 0 gallons

Estimated Total Cost: $0.00

function calculateCoating() { var length = parseFloat(document.getElementById('coat_length').value); var width = parseFloat(document.getElementById('coat_width').value); var coverage = parseFloat(document.getElementById('coat_coverage').value); var coats = parseFloat(document.getElementById('coat_layers').value) || 1; var waste = parseFloat(document.getElementById('coat_waste').value) || 0; var price = parseFloat(document.getElementById('coat_price').value) || 0; if (isNaN(length) || isNaN(width) || isNaN(coverage) || length <= 0 || width <= 0 || coverage <= 0) { alert("Please enter valid positive numbers for Length, Width, and Coverage."); return; } var surfaceArea = length * width; var totalAreaNeeded = surfaceArea * coats; var withWaste = totalAreaNeeded * (1 + (waste / 100)); var gallonsNeeded = withWaste / coverage; var roundedGallons = Math.ceil(gallonsNeeded); var totalCost = roundedGallons * price; document.getElementById('res_area').innerText = surfaceArea.toLocaleString(); document.getElementById('res_volume').innerText = gallonsNeeded.toFixed(2); document.getElementById('res_rounded').innerText = roundedGallons; document.getElementById('res_cost').innerText = totalCost.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2}); document.getElementById('coating_results').style.display = 'block'; }

How to Calculate Coating Requirements

Whether you are painting a warehouse floor or applying a protective sealant to a deck, determining the exact amount of product required is essential for budgeting and project management. A coating calculator helps eliminate guesswork, preventing expensive mid-project trips to the store or excessive leftover waste.

Understanding the Variables

• Coverage Rate: This is provided by the manufacturer. Standard latex paint usually covers 350-400 sq ft per gallon, while high-build epoxies may only cover 100 sq ft.
• Surface Porosity: Rough or porous surfaces (like unfinished concrete) soak up more coating, effectively lowering your coverage rate.
• Waste Factor: Always account for 5-10% waste due to spills, roller absorption, or sprayer overspray.

The Calculation Formula

Total Gallons = [(Area × Number of Coats) × (1 + Waste%)] / Coverage Rate

Example Calculation

If you have a floor that is 20 feet long and 20 feet wide (400 sq ft), and you apply 2 coats of a product that covers 200 sq ft per gallon with a 10% waste factor:

1. 400 sq ft × 2 coats = 800 sq ft total application area.
2. 800 sq ft × 1.10 (waste) = 880 sq ft.
3. 880 / 200 = 4.4 gallons.
4. Result: Purchase 5 gallons.

Pro Tips for Accurate Estimating

1. Measure precisely: Don't eyeball dimensions; use a laser measurer for large industrial spaces.
2. Check the TDS: The Technical Data Sheet (TDS) for industrial coatings often lists coverage at a specific "Mils" thickness (1/1000 of an inch). Ensure your calculation aligns with the recommended thickness.
3. Environmental Factors: High heat or wind can increase evaporation during application, potentially requiring more material.