Tile Layout Calculator
Full and cut tiles across a room.
Enter your values
Enter the room dimension in in.
Enter the tile size in in.
Enter the grout joint in in.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Full tiles across
- 11
- Edge cut tile width
- 5.31 in
- Total tile module
- 12.125 in
- Leftover space
- 10.63 in
Quick answer
Tile layout divides the room dimension by tile plus grout width, centering the layout so edge cuts are equal.
tiles across = floor(room dim / (tile size + grout))
At a glance
| What it does | Full and cut tiles across a room. |
|---|---|
| Category | Home & DIY |
| Inputs needed | Room dimension, Tile size, Grout joint |
| Main output | Full tiles across |
| Formula | tiles across = floor(room dim / (tile size + grout)) |
| Cost | Free — no sign-up, no download |
How to use the Tile Layout Calculator
- 1Enter the room dimension you are laying tile across.
- 2Enter the tile size and planned grout joint width.
- 3Center the layout so both edge cuts equal the value shown, avoiding slivers at one wall.
Inputs explained
- Room dimension(in)
- Enter the room dimension in in.
- Tile size(in)
- Enter the tile size in in.
- Grout joint(in)
- Enter the grout joint in in.
Worked example
Using the values the calculator loads with:
Inputs
- Room dimension144 in
- Tile size12 in
- Grout joint0.125 in
Results
- Full tiles across11
- Edge cut tile width5.31 in
- Total tile module12.125 in
- Leftover space10.63 in
Frequently asked questions
What if the edge cut is very small?
Shift the starting line half a tile so both edges get a wider, easier-to-cut piece.
Does this work for both directions?
Run it twice — once for room length and once for room width.
What do I need to enter into the Tile Layout Calculator?
Just 3 values: room dimension, tile size, grout joint. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Tile Layout Calculator work out the answer?
Tile layout divides the room dimension by tile plus grout width, centering the layout so edge cuts are equal. It applies the formula tiles across = floor(room dim / (tile size + grout)) and shows the working so you can check each step by hand.
Is the Tile Layout Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.