Bags Required
1 bags
Grout
10 lbs
Cost
$27
Sealer
1 pt
10 lbs
1
241 sq ft
$27
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Result
For standard 12x12 inch tiles with 1/8 inch joints in a 48 sq ft bathroom, approximately 5 pounds of sanded grout is needed. One 25 lb bag provides plenty of coverage with extra for future repairs. This small project is perfect for DIY installation.
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Mosaic tiles have many more joints, requiring significantly more grout per square foot. The narrow joints and small tile size make this a time-intensive project.
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For 24x24 inch porcelain tiles with 1/4 inch joints over 400 sq ft, approximately 52 pounds of sanded grout is needed (3 bags of 25 lb). The wider joints are necessary for proper installation of large format tiles to accommodate slight variations.
The amount of grout needed for 100 square feet depends on tile size and joint width. For example, 12×12 inch tiles with 1/8 inch joints require approximately 12-15 pounds of grout (about 1 bag of 25lb grout). Smaller tiles or wider joints will require more grout, while larger tiles or narrower joints will require less.
A 25 lb bag of grout typically covers 95-120 square feet for standard 12×12 inch tiles with 1/8 inch joints. Coverage varies significantly based on tile size and joint width: smaller tiles like 4×4 inches may only cover 45-60 square feet, while large format 24×24 inch tiles can cover 150-200 square feet per bag.
Use unsanded grout for joints narrower than 1/8 inch, as it can fill tight spaces without scratching delicate tiles. Use sanded grout for joints 1/8 inch to 3/8 inch wide, as the sand prevents shrinkage and cracking in wider joints. Epoxy grout is recommended for wet areas and provides superior stain resistance.
Mosaic tiles (typically 1×1 inch or smaller) have many more joints than larger tiles, requiring significantly more grout. A 25 lb bag of grout typically covers only 25-40 square feet of mosaic tile with 1/8 inch joints. Always order extra grout for mosaic installations due to the high number of joints and increased waste.
Grout sealer typically covers 125-150 square feet per pint. For 100 square feet of tiled area, you'll need approximately 1 pint of sealer. Apply sealer 48-72 hours after grouting for cement-based grout. Epoxy grout typically doesn't require sealing as it's naturally stain-resistant.
Several factors affect grout coverage: tile size (smaller tiles need more grout), joint width (wider joints need more grout), tile thickness (thicker tiles need more grout), grout type (different densities affect weight calculations), and application technique (more waste occurs with inexperienced installers). Always order 10-15% extra to account for these variables.
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Last Updated: Feb 13, 2026
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