Running out of grout mid-project means stopping work and hoping the store has the same color in stock. This calculator estimates how many bags of grout you need based on your tile size, joint width, and coverage area.
Tile Dimensions
in
in
in
Grout Joint & Coverage
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sq ft
Scenario: You're grouting 85 sq ft of 4x4 inch shower wall tile with 3/16-inch joints and 1/4-inch thick tiles.
Result: Smaller tiles have more joint length per square foot. 85 sq ft of 4x4 tile with 3/16-inch joints and 1/4-inch depth needs about 37 lbs of grout. With 10% waste, that's 2 bags of 25 lb grout.
It depends on tile size and joint width. Larger tiles with narrow joints need less grout -- about 0.15 lbs per sq ft for 12x12 tiles with 1/8-inch joints. Small mosaic tiles with wider joints can need 1+ lbs per sq ft.
Use sanded grout for joints wider than 1/8 inch. Use unsanded grout for joints 1/8 inch or narrower and for polished stone tiles that could be scratched by sand. Sanded grout is stronger and resists cracking in wider joints.
A 25 lb bag of sanded grout covers roughly 25-175 sq ft depending on tile size and joint width. Large format tiles with narrow joints get the most coverage. Small tiles with wide joints use grout fast.
Mix bags from the same lot number together for consistent color. Different production lots can have slight color variations. Buy all your grout at once and mix bags together in a large container for the most uniform color.
Want to learn more before you start your project?
Read the full guide →
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