Inputs
Project Presets
Presets store all inputs, wall selections, and chosen brand pack.
Results
Tiles across (Nx)
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Tiles down (Ny)
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Total tiles
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Base spacer count
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After reuse + waste
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Packs required
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Assumptions
- Grid layout uses full intersections; edges may use T joints.
- Edge-only mode counts only selected perimeter T joints.
- Non-grid patterns best estimated with per-tile strategies.
- Counts exclude perimeter caulk joints or movement gaps.
Example Data Table
Auto-generated examples using straight pattern and “T along edges + interior crosses,” 5% buffer, no reuse.
| # | Room (L × W) | Tile (L × W) | Grout | Nx | Ny | Tiles | Base spacers | After buffer | Packs (250) |
|---|
Formula Used
- pitch_x = tile_w + grout_w, pitch_y = tile_h + grout_w
- Nx = floor((room_w + grout_w) / pitch_x), Ny = floor((room_l + grout_w) / pitch_y)
- Tiles: Ntiles = Nx · Ny
- Grid strategies:
- Interior crosses: max(0, (Nx−1)·(Ny−1))
- All intersections incl. perimeter: (Nx+1)·(Ny+1)
- T along edges + interior crosses: max(0,(Nx−1)·(Ny−1)) + 2·(Nx−1) + 2·(Ny−1)
- Edge-only T: T = (Nx−1)·I(N,S) + (Ny−1)·I(E,W)
- Per-tile strategies: 2·Ntiles or 4·Ntiles
- Final pieces: ceil( Base · (1 + waste%) / reuse )
- Packs: ceil( Final / pack_size )
For running-bond or diagonal patterns, use per-tile strategies for practical accuracy.
How to Use
- Enter room size and units.
- Enter tile dimensions and grout width with units.
- Select the layout pattern.
- Choose a spacer strategy; grid-only options require straight pattern.
- If using edge-only T, tick the perimeter walls to include.
- Pick a brand bag size or set a custom pack.
- Set reuse cycles, buffer, and pack size.
- Click Calculate to see totals and packs.
- Save a project preset, or export CSV/PDF.
Always verify counts on site; adjust for movement joints, trims, and obstructions.
FAQs
Perimeter joints are often caulked or left as movement gaps. Use T-spacers sparingly at edges if you need to maintain uniform joints during setting.
Follow tile manufacturer and grout recommendations. Rectified porcelain may use narrower joints; handmade tiles typically require wider joints for dimensional variation.
Running-bond layouts create mostly T-junctions rather than crosses. Cross-spacer counts don’t apply. Use per-tile strategies or edge T-counts for practical estimates.
If you can pull spacers after initial set and reuse them, the required purchase quantity drops proportionally to the reuse cycles you enter.
Yes. Use Manage beside the brand selector to add or edit brand profiles and pack sizes. Selecting a brand applies its pack size automatically and saves with your presets.
Tick any combination of walls (North, South, East, West) to count only T joints on those edges. This mode is grid-only and excludes interior crosses by design.