Thinset Calculator
A thinset calculator estimates how much thinset mortar you need to set tile, based on your tile size, the trowel notch size and the total area. Larger tiles need a bigger notch and more thinset per square foot. Enter your tile size and area below for an estimated number of thinset bags.
Coverage by trowel notch / tile size category; user can override coverage per bag.
- Area
- 0 sq ft
- Coverage / bag
- 70 sq ft
Pick your tile size category and enter the area to estimate thinset bags.
Estimate only. Material yields vary by product and brand; check your product label and add a margin.
How Much Thinset Do You Need for Tile?
Thinset usage depends on tile size and the trowel notch it requires: small tiles use a small notch and less thinset, while large-format tiles need a deeper notch and more thinset per square foot. A 50 pound bag covers roughly 40 to 95 square feet depending on notch size. The calculator estimates bags from your tile size and area, and you should buy extra for back-buttering large tiles.
What Trowel Size Goes With Your Tile?
Larger tiles need larger notched trowels, which deposit more thinset: small mosaics use a 3/16 inch notch, standard tiles a 1/4 inch, and large-format tiles a 1/2 inch notch or bigger. The notch size sets the coverage per bag, so it drives the thinset quantity. Match the trowel to your tile, then let the calculator estimate bags from the resulting coverage.
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Frequently asked questions
- How much thinset do I need for tile?
- It depends on tile size and trowel notch. A 50 pound bag covers about 40 to 95 square feet. Enter your tile size and area in the calculator for a bag estimate.
- What size trowel for large tile?
- Large-format tiles need a 1/2 inch notch or bigger, which uses more thinset, while small tiles use a 3/16 or 1/4 inch notch and less.