How to Use This Calculator
Enter your garage length and width in feet. Use the quick-pick tile size buttons to select your tile format — 24×24 is the most common for garage floors, 12×12 works for smaller garages or tighter budgets. Set waste to 10% for a straight grid layout, 15% if you have a floor drain, posts, or are cutting around a vehicle lift. If you know your box price and tiles-per-box, enter them to get a total material cost. For garages with a rear alcove or side workshop area, calculate each rectangular section separately and add the tile counts.
How to Calculate Garage Floor Tile
Garage tile formula: tiles needed = ⌈(floor area sq ft × (1 + waste%÷100)) ÷ (tile width in × tile length in ÷ 144)⌉. Divide tile dimensions in inches by 144 to convert to square feet, then divide the total floor area (plus waste) by the tile area.
| Garage size | Sq ft | 24×24 tiles (+10%) | 12×12 tiles (+10%) |
|---|---|---|---|
| 12×20 single car | 240 | 66 | 264 |
| 20×20 standard | 400 | 110 | 440 |
| 20×40 double | 800 | 220 | 880 |
| 30×30 three-car | 900 | 248 | 990 |
Tiles per box vary by manufacturer and tile size. A common 24×24 box contains 3 to 4 tiles (12 to 16 sq ft). A 12×12 box typically contains 10 to 15 tiles. Enter your specific box size in the calculator to get an exact box count and avoid over- or under-ordering.
Garage Floor Tile Tips
Check the concrete for moisture before ordering tile. Tape a sheet of plastic to the floor for 24 hours. Condensation under the plastic means you have a moisture problem that will cause thinset failure within months. Fix the moisture source or apply a moisture-mitigation membrane rated for tile before proceeding. This step is skipped on most failed garage tile jobs.
Use medium-bed mortar, not standard thinset, for 24×24 and larger tiles. Standard thinset sags under large-format tile weight and creates hollow spots. Medium-bed mortar (like Laticrete 272 or Custom Building Products MegaFlex) is formulated to support large tiles and provide full back coverage, which is mandatory for garage floors that see vehicle loads.
Leave a 1/4-inch expansion gap along all walls. Concrete slabs expand and contract with temperature, and a garage sees larger temperature swings than any interior room. Without expansion gaps, tile will tent and crack within the first year. Fill the wall gap with backer rod and a flexible sealant, not grout. Install control-joint tile trim strips over any existing concrete expansion joints in the slab.
What to Buy
For a permanent garage floor: 24×24 rectified porcelain with a PEI 4 or 5 rating and COF 0.60+. MSI, Emser, and Daltile all offer commercial-grade garage tile options. Pair with medium-bed mortar, epoxy grout or sanded grout with penetrating sealer, and a 1/8-inch notched trowel for back-buttering large tiles.
For a non-permanent option: interlocking modular tiles from RaceDeck, G-Floor, or Swisstrax. These sit directly on the concrete without adhesive, drain through the tile gaps, and can be removed if you sell the house or change your mind. They cost more per square foot than mortar-set porcelain but require no surface prep and can be installed in an afternoon. Not suitable for spaces where vehicles drip significant oil — clean the concrete first and address any active leaks.