Tile Square Footage and Grout Calculator
ANA›Life Services Authority›National Calculator Authority›Tile Square Footage and Grout Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Tile Square Footage and Grout Calculator
Calculate how many tiles you need and how much grout to purchase for your tiling project, including a waste allowance.
Room / Area Length (ft)
Room / Area Width (ft)
Tile Length (inches)
Tile Width (inches)
Grout Joint Width (inches)
Grout Joint Depth (inches)
Waste Factor (%)
Grout Coverage (sq ft per lb) (see label; typical 50–100)
Calculate
function tilCalc() { var resultDiv = document.getElementById('til-result');
var roomL = parseFloat(document.getElementById('til-room-length').value); var roomW = parseFloat(document.getElementById('til-room-width').value); var tileL = parseFloat(document.getElementById('til-tile-length').value); var tileW = parseFloat(document.getElementById('til-tile-width').value); var joint = parseFloat(document.getElementById('til-grout-joint').value); var depth = parseFloat(document.getElementById('til-grout-depth').value); var waste = parseFloat(document.getElementById('til-waste').value); var coverage= parseFloat(document.getElementById('til-grout-coverage').value);
// --- Validation --- var errors = []; if (isNaN(roomL) || roomL 50) errors.push("Waste factor must be between 0 and 50%."); if (isNaN(coverage)|| coverage = tileL) errors.push("Grout joint width must be less than tile length."); if (!isNaN(joint) && !isNaN(tileW) && joint >= tileW) errors.push("Grout joint width must be less than tile width."); if (!isNaN(depth) && !isNaN(tileL) && depth >= tileL) errors.push("Grout joint depth must be less than tile length.");
if (errors.length > 0) { resultDiv.innerHTML = '' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Calculations ---
// 1. Area of room in sq ft var roomAreaSqFt = roomL * roomW;
// 2. Area of one tile in sq ft var tileAreaSqFt = (tileL / 12) * (tileW / 12);
// 3. Tiles needed without waste var tilesBase = roomAreaSqFt / tileAreaSqFt;
// 4. Tiles needed with waste var tilesWithWaste = tilesBase * (1 + waste / 100); var tilesNeeded = Math.ceil(tilesWithWaste);
// 5. Total tile area to purchase (sq ft) including waste var totalTileAreaSqFt = tilesNeeded * tileAreaSqFt;
// 6. Grout quantity (lbs) using industry formula: // Grout (lbs) = [ (TileL + TileW) / (TileL * TileW) ] * JointWidth * Depth * 144 * AreaSqFt * 0.09 // Where TileL, TileW, JointWidth, Depth are all in inches; AreaSqFt in sq ft // Factor 144 converts sq ft to sq in; 0.09 is grout density factor (lbs/cu in) for sanded grout // Reference: TCNA Handbook / standard tile industry formula var groutDensity = 0.09; // lbs per cubic inch (sanded grout; unsanded ~0.085) var groutLbsRaw = ((tileL + tileW) / (tileL * tileW)) * joint * depth * 144 * roomAreaSqFt * groutDensity;
// 6b. Add waste factor to grout as well var groutLbsWithWaste = groutLbsRaw * (1 + waste / 100);
// 7. Grout bags needed (using user-supplied coverage in sq ft/lb) // Bags of 25 lbs is common; the calculator reports lbs and let user divide by bag size // Also compute 10-lb and 25-lb bag counts var groutBags10 = Math.ceil(groutLbsWithWaste / 10); var groutBags25 = Math.ceil(groutLbsWithWaste / 25);
// --- Format output --- resultDiv.innerHTML = '### Results ' + '' + 'ParameterValue' + 'Room Area' + roomAreaSqFt.toFixed(2) + ' sq ft' + 'Tile Size' + tileL + '" × ' + tileW + '" (' + tileAreaSqFt.toFixed(4) + ' sq ft each)' + 'Tiles Needed (no waste)' + Math.ceil(tilesBase) + ' tiles' + 'Waste Factor' + waste + '%' + 'Tiles to Purchase' + tilesNeeded + ' tiles' + 'Total Tile Area to Purchase' + totalTileAreaSqFt.toFixed(2) + ' sq ft' + 'Grout Needed (base, no waste)' + groutLbsRaw.toFixed(2) + ' lbs' + 'Grout to Purchase (with waste)' + groutLbsWithWaste.toFixed(2) + ' lbs' + '10-lb Bags of Grout' + groutBags10 + ' bags' + '25-lb Bags of Grout' + groutBags25 + ' bags' + '' + '* Grout estimate uses sanded grout density (0.09 lbs/in³). For unsanded grout use 0.085 lbs/in³ — results will be ~6% lower.
'; }
#### Formulas Used
Room Area (sq ft): Room Area = Length × Width
Tile Area (sq ft): Tile Area = (Tile Length / 12) × (Tile Width / 12)
Tiles Needed (with waste): Tiles = ⌈ (Room Area / Tile Area) × (1 + Waste% / 100) ⌉
Grout Quantity (lbs) — TCNA Industry Formula: Grout (lbs) = [(TileL + TileW) / (TileL × TileW)] × JointWidth × JointDepth × 144 × RoomArea × 0.09
Where TileL, TileW, JointWidth, JointDepth are in inches; RoomArea in sq ft; 144 converts sq ft → sq in; 0.09 = sanded grout density (lbs/in³).
Grout with Waste: Groutfinal = Groutbase × (1 + Waste% / 100)
#### Assumptions & References
- Grout density of 0.09 lbs/in³ is standard for sanded grout (joints ≥ 1/8"). Use 0.085 for unsanded grout (joints < 1/8").
- Formula source: TCNA (Tile Council of North America) Handbook and standard tile industry practice.
- A 10% waste factor is the industry default for straight-lay patterns; diagonal or complex patterns typically require 15–20%.
- This calculator assumes a rectangular area. Subtract areas for cabinets, islands, or fixtures before entering dimensions.
- Tile counts are always rounded up to the nearest whole tile.
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