Grout & Thinset Calculator
Estimate grout pounds and thinset mortar bags for a tile job. Accounts for tile size, joint width, tile thickness, trowel size, and waste — so you order the right amount the first time.
Common: 3/8" = 0.375, 1/4" = 0.25
Common: 1/8" = 0.125, 1/16" = 0.0625
Grout needed
0.5
lbs (≈ 1 × 25 lb bags)
Or smaller bags
1
× 10 lb bags
Thinset
2
× 50 lb bags
Tip: grout consumption climbs fast with small tile + wide joints. A mosaic with 1/4" joints can use 3-5× the grout of 12" tile with 1/8" joints over the same area.
How to Use This Calculator
Enter the area to tile and your tile dimensions, thickness, and grout joint width. Grout use rises with smaller tiles, wider joints, and thicker tile. Pick your trowel size for thinset coverage (bigger notch = more mortar per square foot = fewer sq ft per bag). The waste factor covers spillage and partial bags.
Formula Used
Grout (lb) = ((L + W)/(L × W)) × joint × thickness × area × 0.55 × waste, dimensions in inches. Thinset bags = (area × waste) ÷ coverage-per-bag, where coverage depends on trowel notch size.
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Disclaimer
This calculator is for estimation purposes only. Results may vary based on local conditions, materials, and building codes. Always consult a licensed professional before making decisions based on these calculations. MyContractorTools is not responsible for any errors or omissions.