The Floor Tile Layout Calculator plans where your tiles fall so the cut pieces along opposite walls are equal and never thin slivers — in both directions across the room.
It fits as many full tiles (plus joints) as possible, splits the leftover equally between the two walls, and drops one full tile if an edge cut would be less than one-third of a tile. A second mode estimates how many pieces to buy for straight, diagonal or herringbone layouts using preset pattern allowances.
Floor Tile Layout Calculator
Centre a tile or plank floor: full tiles each way, balanced edge cuts, and extra material for diagonal or herringbone patterns.
Allowances are common rules of thumb; complex rooms need more.
Formula
Balanced layout (for each direction):
- n = ⌊(D − j) ÷ (t + j)⌋ full tiles
- cut = (D − n × t − (n + 1) × j) ÷ 2 at each wall
- If cut < t ÷ 3, use n − 1 tiles and recalculate
Pattern material: pieces = ⌈A ÷ piece area × (1 + pattern allowance)⌉
Where D = room dimension, t = tile size in that direction, j = grout joint, A = floor area.
How the Calculation Works
Step 1: Count full tiles across the width and along the length.
Step 2: Split the leftover space equally between opposite walls.
Step 3: Avoid slivers by using one fewer full tile when a cut would be too narrow.
Variables Explained
| Input | Meaning |
|---|---|
| Room width, length | Wall-to-wall dimensions |
| Tile width, length | Tile size in each direction |
| Pattern | Straight/brick, diagonal or herringbone/chevron preset allowance |
Example Calculation
Given: room 144 × 180 in, 12 × 24 in tiles, 3/16 in joints
Across 144 in: 11 full tiles, cuts of 4.875 in at each wall
Along 180 in: 7 tiles would leave 5.25 in cuts (less than ⅓ of 24 in), so use 6 full tiles with cuts of about 17.34 in at each end
Pattern material
180 ft² of 2 ft² planks with the diagonal preset (15%): 180 ÷ 2 × 1.15 = 103.5 → 104 pieces (207 ft²)
Dimensions Explained
Where to start
Snap center lines in both directions and lay out a dry row to confirm the cuts before setting tile. Doorways and focal walls may justify shifting the layout so full tiles land where they’re most visible.
Out-of-square rooms
If opposite walls aren’t parallel, cuts will taper; measure at both ends of each wall.
Waste Factor Considerations
The pattern allowances are common rules of thumb built into the calculator. Your actual waste depends on room shape, obstacles and tile size — complex rooms need more.
Frequently Asked Questions
How do I center floor tile in a room?
Split the leftover space equally between opposite walls, in both directions.
How much extra tile for a diagonal layout?
Diagonal layouts create more cuts; the calculator’s diagonal preset adds 15%. Adjust for your room.
How much extra for herringbone?
The herringbone preset adds 20%; complex rooms may need more.
Why avoid thin cuts at the wall?
Slivers are fragile, hard to cut and look unbalanced.
Does this work for planks?
Yes — enter the plank width and length as the tile size.