Buying guide
Best Tile Trowel: The Right Notch for Every Tile Size
Which notch size and shape to buy for your tile, why it matters for mortar coverage, and how many bags of thinset each notch uses.
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The notched trowel controls how much mortar ends up under each tile. Too small a notch leaves voids — hollow-sounding tile that cracks under load — and too large a notch squeezes mortar up through the joints. Industry standards call for at least 80% mortar contact on dry interior floors and 95% in showers and wet areas.
Below, the trowel types are compared and matched to tile sizes with the same function as our tile trowel size calculator. Thinset quantities come from the thinset calculator. Always check the mortar maker's recommendation for your tile as well.
Compared by type
Pros and cons describe each type from its specifications. The product in each row is a current, well-rated option of that type on Amazon, refreshed twice a day — check the listing's specifications against the “check” line before you buy.
1/4 × 1/4 in square-notch trowel
Best for: Wall tile and small floor tile up to about 8 in
See options on AmazonCheck: Stainless steel blade and a comfortable, sealed handle
- Right mortar bed for most wall and small floor tile
- Easy to control on vertical surfaces
- Uses the least thinset of the square notches
- Too little mortar for tile over about 8 in
- Not enough for uneven substrates
1/4 × 3/8 in square-notch trowel
Best for: Floor tile from about 8 to 15 in, such as 12 × 12
See options on AmazonCheck: Notch dimensions stamped on the blade and stainless steel
- The common all-round floor trowel
- Good coverage on standard tile
- Works for back-buttering too (flat side)
- Not enough for large-format tile
- Uses more thinset than a 1/4 in notch
1/2 × 1/2 in square-notch trowel
Best for: Large-format tile with any side 15 in or longer
MARSHALLTOWN Margin Trowel, 5 x 2 Inch, Masonry Tool, Tile Tool$7.99Check price on AmazonCheck: A thick, rigid blade that does not flex when combing heavy mortar
- Builds the bed large tile needs
- Pairs with large-and-heavy-tile mortar
- Helps reach full coverage with back-buttering
- Heavy mortar use per square foot
- Too much mortar for small tile — it squeezes up through the joints
- Tiring to comb on walls
Slant-notch or euro-notch trowel
Best for: Large-format and plank tile where ridges must collapse fully
See options on AmazonCheck: Notch size for your tile and whether it is meant for one-direction troweling
- Ridges collapse more easily for better coverage
- Less air trapped under long planks
- Less mortar than a deep square notch for similar coverage
- Costs more than a basic square notch
- Must be combed in straight, one-direction lines
- Less common in stores
V-notch trowel
Best for: Mosaics and small wall tile, and premixed adhesive on dry walls
See options on AmazonCheck: The V size (3/16 in is common) and a flexible blade
- Thin, even bed that does not squeeze up through mosaic joints
- Right for premixed adhesive on small dry-area wall tile
- Light and easy to control
- Far too little mortar for floor tile
- Not for wet areas with premixed adhesive
| Type | Current option | Pros | Cons |
|---|---|---|---|
| 1/4 × 1/4 in square-notch trowelBest for: Wall tile and small floor tile up to about 8 inCheck: Stainless steel blade and a comfortable, sealed handle | See options on Amazon |
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| 1/4 × 3/8 in square-notch trowelBest for: Floor tile from about 8 to 15 in, such as 12 × 12Check: Notch dimensions stamped on the blade and stainless steel | See options on Amazon |
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| 1/2 × 1/2 in square-notch trowelBest for: Large-format tile with any side 15 in or longerCheck: A thick, rigid blade that does not flex when combing heavy mortar | MARSHALLTOWN Margin Trowel, 5 x 2 Inch, Masonry Tool, Tile Tool$7.99Check price on Amazon |
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| Slant-notch or euro-notch trowelBest for: Large-format and plank tile where ridges must collapse fullyCheck: Notch size for your tile and whether it is meant for one-direction troweling | See options on Amazon |
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| V-notch trowelBest for: Mosaics and small wall tile, and premixed adhesive on dry wallsCheck: The V size (3/16 in is common) and a flexible blade | See options on Amazon |
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Prices as of Oct 3, 2026, 4:38 AM UTC. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product.
Which notch for your tile, and how much thinset
These use the tile trowel size calculator function for 120 sq ft of each job. Bags are 50 lb; coverage per bag falls as the notch gets deeper.
Worked example: 120 sq ft, three common jobs
- 3 × 6 in subway tile on a dry wall: 1/4" x 1/4" x 1/4" square-notch → 2 bags (about 95 sq ft per bag)
- 12 × 12 in floor tile: 1/4" x 3/8" x 1/4" square-notch → 2 bags (about 75 sq ft per bag)
- 12 × 24 in floor tile (large format): 1/2" x 1/2" x 1/2" square-notch → 3 bags (about 45 sq ft per bag), and back-butter each tile
2, 2 and 3 bags for the same area — the notch drives the mortar order more than the area does.
Ordering mortar for a whole room? The thinset calculator and the thinset buying guide cover bag counts and mortar types.
How to check you have the right trowel
- Comb the mortar in straight lines in one direction, not swirls, so air can escape as the tile is pressed down.
- Set a tile, press and slide it slightly across the ridges, then lift it: the back should be at least 80% covered (95% in showers), with mortar at all corners and edges.
- If you see bare ridges, move up a notch size or back-butter the tile.
- If mortar squeezes up through the joints, the notch is too big for the tile.
- Notches wear down over a few jobs; a worn trowel leaves less mortar than its label says.
| Tile | Notch | Notes |
|---|---|---|
| Mosaics and small wall tile | 3/16 in V-notch or 1/4 × 1/4 in square | Thin bed so mortar does not fill the joints |
| Up to about 8 in | 1/4 × 1/4 in square | Most wall tile |
| About 8 to 15 in | 1/4 × 3/8 in square | Most standard floor tile |
| 15 in and larger | 1/2 × 1/2 in square or slant-notch | Back-butter; use large-format mortar |
Safety notes
- Wear gloves: thinset is alkaline and can irritate or burn skin.
- Wear a dust mask when mixing powdered thinset, and knee pads for floor work.
Frequently asked questions
What size trowel do I need for 12 × 24 tile?
A 1/2 × 1/2 in square-notch (or a slant-notch made for large tile), with back-buttering, because 12 × 24 is large-format tile. Check coverage by lifting a tile after setting it.
What size trowel for 12 × 12 floor tile?
A 1/4 × 3/8 in square-notch trowel suits most 12 × 12 floor tile on a flat floor.
What trowel for subway tile?
A 1/4 × 1/4 in square-notch for 3 × 6 in subway tile on a wall, or a 3/16 in V-notch with premixed adhesive on a dry wall where the adhesive maker allows it.
Is a slant-notch trowel better than a square notch?
For large-format and plank tile it can make it easier to reach full coverage, because its ridges collapse more readily. For small and standard tile a square notch is fine.
How do I know if I have enough thinset coverage?
Lift a freshly set tile: at least 80% of the back should be covered on dry interior floors and 95% in wet areas, with full support at the corners and edges.