Understanding your result
The headline is the tiles to buy, with the ramp edges and corners in the line beneath it. The stats give the floor area, the grid and the ramp edges; the table shows the garage, the tile size, the grid across and deep, the tiles with spares, the edge pieces and the cost.
The grid is the garage width and depth each divided by the tile size and rounded up, because the last row against the wall is a cut tile but a whole tile bought. The spares are 3% on top, for cutting mistakes and for replacing a damaged tile later; garage tiles are easy to swap one at a time, which is one of their advantages, so a few in reserve are worth having.
Ramp edges cover the door opening, one piece per tile width, and the corners are where the ramped edge turns at the ends of the opening. If your tiles finish against the walls on both sides of the door, the corners are not needed. Other workshop and gym floors are counted on the rubber gym flooring calculator and the foam play mat calculator. If you are weighing tiles against a coating, the concrete floor paint calculator at Paints Calculator counts the epoxy kits for the same garage.
How we calculate this
Counting the grid rather than dividing the area matters for interlocking tiles because each cut tile at a wall is a whole tile bought, and garages are rarely an exact number of tiles wide. The 3% spare is a judgement; tiles are not consumed by a layout waste the way ceramic or wood are, because there are no pattern offcuts. The guide to garage and gym floors compares tile, rubber and coatings, and the guide to waste factors explains why a grid of identical pieces needs so little.
The assumptions behind the numbers
| Assumption | Default | Where it comes from |
|---|---|---|
| Garage sizes | 12 × 22, 20 × 20, 22 × 22, 32 × 22 ft | Common interior footprints in US house plans; measure yours |
| Tile | 12 in square | The most common interlocking garage tile size; 18 and 24 in also exist |
| Spare | 3% | A judgement for cutting mistakes and future replacements |
| Door | 16 ft (double); 8 to 9 ft single | Standard US garage door widths |
| Ramp edges | one per tile width along the door, plus corners | Typical tile system packaging |
| Wall gap | about 1/4 in | Tile makers’ instructions; plastic expands in a hot garage |
Assumptions last reviewed October 8, 2026.
The calculator treats the garage as a rectangle and does not subtract steps, a workbench or a water heater platform; tile around them and you will use a few of the spares. It does not count logos, parking pads or colour borders made from a second colour; count those tiles separately and subtract them from the main colour. It also assumes the tiles are laid wall to wall rather than as a parking mat under the car alone.
Two worked examples
A one-car garage, 22 × 12 ft
12 in tiles at $3.50, a 9 ft door with a ramp and 2 corners.
- Grid: 12 across × 22 deep = 264 tiles; with 3%: 272 tiles, $952
- Ramp edges: 9; corners: 2
Two hundred seventy-two tiles go down in an afternoon with no curing. The ramp is what makes the floor drive-on; without it the first tyre over the edge pops the front row loose.
A large two-car garage, 22 × 22 ft, in 18 in tiles
16 ft door with a ramp and 2 corners.
- Grid: 22 ÷ 1.5 = 14.7, so 15 each way: 225 tiles; with 3%: 232 tiles
- Ramp edges: 16 ÷ 1.5 = 10.7, so 11; corners 2
Larger tiles mean fewer pieces and fewer joints, but the last row is still a cut and, at 15 × 15, the grid is 3% bigger than the garage. The price per square foot of 18 in tiles is usually what decides it.
Where to find your inputs
Garage size. Measure the interior at floor level, from the inside of the door to the back wall and wall to wall. Use the custom option if it differs from the presets.
Tile size. On the product page; most are 12 in, nominal.
Door width. The opening at floor level, between the jambs.
Corners. Two if the ramp turns at both ends of the door; none if the tiles run to the walls at both sides of the opening.
Common mistakes
- Dividing the area by the tile area. The last row at each wall is a whole tile bought. Count the grid.
- No ramp at the door. Tyres push the edge row loose and the edge is a trip hazard.
- Tight to the walls. Plastic grows in summer heat. Leave about 1/4 in.
- Solid tiles where snow melts. Water pools on top. Vented tiles drain.
- Laying over standing oil. Tiles float, but oil under them smells and spreads. Clean the slab.
- Ordering colours separately without subtracting. A border or logo replaces main-colour tiles.
Questions people ask
- How many interlocking tiles for a two-car garage?
- A typical two-car garage is about 20 × 20 ft, or 400 sq ft. In 12 inch tiles that is a 20 × 20 grid of 400 tiles; with 3% spare, 412. A 16 ft door needs 16 ramped edge pieces and 2 corners if the ramp turns at both ends.
- How big is a one-, two- or three-car garage?
- Typical interior sizes are about 12 × 22 ft for one car, 20 × 20 to 22 × 22 ft for two, and 32 × 22 ft for three. Garages vary a lot, so measure yours; the presets are a starting point.
- Do garage floor tiles need ramped edges?
- Along the door opening, yes, so the car tyres climb onto the tiles rather than hitting a step, and so the edge is not a trip hazard. Along walls the tiles are cut and left with a small gap. Most makers sell ramp edges and corners as separate pieces.
- Vented or solid garage tiles?
- Vented tiles let water, snow melt and spills drain to the slab and dry underneath, which suits wet climates. Solid tiles keep spills on top where they can be mopped up, which suits workshops and oil changes. The count is the same.
- Do I need to prepare the slab?
- Less than for paint or epoxy. Tiles float on the slab, so cracks and stains are covered, but the slab should be swept, dry and free of standing oil, and active moisture or a slab that heaves should be dealt with first.
- Should I tile or paint the garage floor?
- Tiles cost more per square foot but go down in a day with no curing and can be lifted and moved. Epoxy and floor paint cost less but need careful preparation and days to cure. Our sister site Paints Calculator has a concrete floor paint calculator for the same garage.