Concrete Resurfacing Coverage Calculator
ANA›Life Services Authority›National Calculator Authority›Concrete Resurfacing Coverage Calculator
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Concrete Resurfacing Coverage Calculator
Estimate the amount of concrete resurfacer (in bags or gallons) needed for your project based on the surface area and desired application thickness.
Surface Length (ft)
Surface Width (ft)
Application Thickness (inches)
Typical range: 1/16 in (0.0625) to 1/2 in (0.5) for resurfacing; up to 2 in for overlays
Product Type
Bagged Resurfacer (50 lb bag) Liquid Resurfacer (1 gallon)
Waste / Overlap Factor (%)
Recommended: 10% for simple areas, 15–20% for irregular shapes
Calculate
function conCalc() { var resultDiv = document.getElementById("con-result"); resultDiv.style.display = "block"; resultDiv.className = "calc-result";
var length = parseFloat(document.getElementById("con-length").value); var width = parseFloat(document.getElementById("con-width").value); var thickness = parseFloat(document.getElementById("con-thickness").value); var product = document.getElementById("con-product-type").value; var waste = parseFloat(document.getElementById("con-waste").value);
// --- Validation --- if (isNaN(length) || length 2) { resultDiv.className = "calc-result calc-error"; resultDiv.innerHTML = "⚠ Application thickness must be between 0.0625 in (1/16") and 2 in."; return; } if (isNaN(waste) || waste 50) { resultDiv.className = "calc-result calc-error"; resultDiv.innerHTML = "⚠ Waste factor must be between 0% and 50%."; return; }
// --- Core Calculations --- // Area in square feet var areaSqFt = length * width;
// Volume in cubic feet var thicknessFt = thickness / 12; var volumeCuFt = areaSqFt * thicknessFt;
// Volume in cubic yards (for reference) var volumeCuYd = volumeCuFt / 27;
// Apply waste factor var wasteFactor = 1 + (waste / 100); var adjustedVolumeCuFt = volumeCuFt * wasteFactor;
var unitsNeeded, unitLabel, coverageNote;
if (product === "bag") { // Standard 50 lb bag of concrete resurfacer covers: // ~40–45 sq ft at 1/8" thickness (industry standard: ~43 sq ft @ 1/8") // Coverage scales inversely with thickness. // Coverage (sq ft) per bag = 43 / (thickness_in / 0.125) // Equivalent: coverage = 43 * 0.125 / thickness_in = 5.375 / thickness_in sq ft per bag var coveragePerBag = 5.375 / thickness; // sq ft per 50 lb bag var rawBags = areaSqFt / coveragePerBag; var adjustedBags = rawBags * wasteFactor; unitsNeeded = Math.ceil(adjustedBags); unitLabel = "50 lb bag(s)"; coverageNote = "A 50 lb bag covers approximately " + coveragePerBag.toFixed(1) + " sq ft at " + thickness + "" thickness."; } else { // Liquid resurfacer: typical coverage ~100–125 sq ft per gallon at 1/16" thickness // Using 100 sq ft/gal @ 1/16" as conservative standard // Coverage (sq ft) per gallon = 6.25 / thickness_in (100 * 0.0625 = 6.25) var coveragePerGallon = 6.25 / thickness; // sq ft per gallon var rawGallons = areaSqFt / coveragePerGallon; var adjustedGallons = rawGallons * wasteFactor; unitsNeeded = Math.ceil(adjustedGallons); unitLabel = "gallon(s)"; coverageNote = "Liquid resurfacer covers approximately " + coveragePerGallon.toFixed(1) + " sq ft per gallon at " + thickness + "" thickness."; }
// Weight of material (for bagged product reference) var totalLbs = (product === "bag") ? (unitsNeeded * 50) : "N/A";
// --- Output --- resultDiv.innerHTML = "### Results " + "" + "Surface Area" + areaSqFt.toFixed(2) + " sq ft" + "Application Thickness" + thickness + " in (" + thicknessFt.toFixed(4) + " ft)" + "Net Volume Required" + volumeCuFt.toFixed(4) + " cu ft (" + volumeCuYd.toFixed(4) + " cu yd)" + "Waste Factor Applied" + waste + "%" + "Adjusted Volume" + adjustedVolumeCuFt.toFixed(4) + " cu ft" + "Units Needed" + unitsNeeded + " " + unitLabel + "" + (product === "bag" ? "Total Product Weight" + totalLbs + " lbs" : "") + "" + "" + coverageNote + "
"; }
#### Formulas Used
Surface Area: Area (sq ft) = Length (ft) × Width (ft)
Volume Required: Volume (cu ft) = Area (sq ft) × (Thickness (in) ÷ 12)
Adjusted Volume (with waste): Adjusted Volume = Volume × (1 + Waste% ÷ 100)
Bags Required (50 lb bag): Coverage per bag (sq ft) = 5.375 ÷ Thickness (in) Derived from: 50 lb bag covers ~43 sq ft at 1/8" (0.125") thickness Bags = ⌈ Area ÷ Coverage per bag × Waste Factor ⌉
Gallons Required (liquid resurfacer): Coverage per gallon (sq ft) = 6.25 ÷ Thickness (in) Derived from: 1 gallon covers ~100 sq ft at 1/16" (0.0625") thickness Gallons = ⌈ Area ÷ Coverage per gallon × Waste Factor ⌉
#### Assumptions & References
- A standard 50 lb bag of concrete resurfacer (e.g., Quikrete Concrete Resurfacer) covers approximately 43 sq ft at 1/8" thickness, yielding a volume constant of 5.375 sq ft·in per bag. Coverage scales inversely with thickness.
- A standard liquid resurfacer covers approximately 100 sq ft per gallon at 1/16" thickness, yielding a volume constant of 6.25 sq ft·in per gallon.
- Typical resurfacing applications range from 1/16" to 1/2"; structural overlays may go up to 2".
- A 10% waste factor is recommended as a minimum for straightforward rectangular slabs; increase to 15–20% for irregular shapes, cutouts, or first-time applicators.
- Results are rounded up to the nearest whole unit to ensure sufficient material.
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