Tile Grout Amount Calculator

Tile grout quantity depends on the tile size, grout joint width, tile thickness, and total area. Smaller tiles with wider grout lines need significantly more grout than large tiles with thin joints.

Grout coverage formula: Grout volume (cu in per sq ft) = Joint width × Tile depth × Total joint length per sq ft

For a simplified calculation: Pounds of grout per sq ft = (L + W) × D × J / (L × W) × 1.13

Where L = tile length (in), W = tile width (in), D = tile depth/thickness (in), J = joint width (in).

Typical grout coverage (per 25 lb bag):

• 12×12 tile, 1/8 inch joint: 95–105 sq ft
• 12×12 tile, 1/4 inch joint: 47–53 sq ft
• 6×6 tile, 1/8 inch joint: 48–53 sq ft
• 4×4 tile, 1/8 inch joint: 32–35 sq ft
• 2×2 mosaic, 1/16 inch joint: 18–20 sq ft
• 24×24 tile, 1/8 inch joint: 190–210 sq ft

Grout types:

• Unsanded grout — For joints 1/8 inch (3 mm) or narrower. Smoother finish.
• Sanded grout — For joints wider than 1/8 inch. Stronger, resists cracking.
• Epoxy grout — Most durable, waterproof, stain-resistant. Harder to apply.

Grout joint width guidelines:

• Natural stone: 1/16 to 1/8 inch
• Rectified (precision-cut) tile: 1/16 inch minimum
• Standard floor tile: 1/8 to 3/16 inch
• Rustic or handmade tile: 1/4 to 3/8 inch

Tip: Mix grout in small batches — it begins to set within 20–30 minutes. Buy 10% extra to account for waste in the bucket and on tools. Keep one bag in reserve for future repairs, as matching grout color later can be difficult.