Grout Calculator
Calculate how much grout you need based on tile size, joint width, and tile thickness.
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How to Calculate Grout
Grout volume depends on tile size, joint width, and tile depth. Formula: (joint width x tile depth x joint length per sq ft). Convert to pounds using grout density. Add 10% for waste.
Frequently Asked Questions
How much grout do I need per square foot?
Depends on tile size and joint width. Small tiles (2x2) with 1/8" joints: ~1.5 lbs/sq ft. Large tiles (12x12) with 1/8" joints: ~0.25 lbs/sq ft. Medium tiles (6x6) with 1/8" joints: ~0.5 lbs/sq ft.
What grout joint width should I use?
1/16" for rectified tiles. 1/8" standard for wall tiles. 3/16" for floor tiles. 1/4"+ for rustic or handmade tiles.
How much does grout cost?
Standard sanded grout costs $10-$15 per 25 lb bag. Epoxy grout costs $30-$50 per unit but is more stain-resistant and durable. One 25 lb bag covers roughly 50-200 sq ft depending on tile size and joint width.
What's the difference between sanded and unsanded grout?
Use unsanded grout for joints 1/8 inch (3 mm) or narrower — typically wall tiles. Use sanded grout for joints wider than 1/8 inch — typically floor tiles. Sanded grout is stronger and resists cracking in wider joints.
How long does grout take to dry?
Grout is firm enough to clean within 15-30 minutes. It cures enough to walk on in 24 hours. Full cure takes 28 days. Avoid heavy traffic and water exposure for at least 72 hours after grouting.