TryBuildCalcBathroom Tile Calculator (Tiles, Boxes, Wastage & Cost)
Estimate floor and wall tiles with wastage for bathroom tiling work.
🕒 Last updated: July 14, 2026
Inputs
Section 1: Area & Tile Size
Common tile sizes
ℹ️Leave blank to count tiles edge-to-edge with no gap. Fills into the tile count itself, not just the area.
ℹ️Total footprint of windows, built-in units, or pillars that won't be tiled — deducted from the full-tile count, not the room area.
Section 2: Layout Pattern & Wastage
ℹ️Auto-suggests a matching wastage % (also factoring in room size and tile size) — pick a value to override, and later edits won't overwrite your choice. Choose Custom for full manual control.
ℹ️Auto-suggested from layout pattern, room size, and tile size — pick a value to override.
Section 3: Boxes
ℹ️Used to show the recommended number of boxes and (if entered) box-based cost.
Section 4: Cost
Recommended tiles: 42 tiles (7 boxes)
Wall Area: 4.46 m²
Layout Summary
Wall Area: 4.46 m² (48.00 sq ft)
Tile Area: 0.1800 m² (1.94 sq ft)
Tiles per Row: 4
Rows Required: 6
Full Tiles: 24
Cut Tiles: 11
Base Tiles Required: 35 tiles
Purchase Quantity
Recommended Purchase: 42 tiles
Extra Tiles (wastage): 7 tiles
Boxes: 7
Quick Insight
Buy at least 42 tiles (7 boxes) from the same production batch.
Calculated using the layout method — full tiles plus edge cut tiles — not simple area division.
Assumptions Used
Layout method (full tiles + edge cuts), not simple area division | Area-only estimate would show 25 tiles before layout adjustment | Boxes rounded up to the next whole box.
Bill of Materials
Main material: 42 tiles + recommended tools
+−
Bill of Materials
Main material: 42 tiles + recommended tools
Computed items reflect your entered area and tile size; consumables below are general recommendations — actual needs vary by product and site.
For Your Job
Tiles
42 tiles
7 boxes
General Tools & Consumables
Tile spacers
Manual tile cutter or wet saw
Rubber mallet
Tile levelling clip system
Grout float & sponge
Approximate results for planning only. Verify with a professional.
Continue with the same room and tile details
Quickly estimate related finishing materials without re-entering the room size.
Looking for the verification checklist, reference tables, or tips and mistakes?See the complete Tile Calculator.
Bathroom tile estimate
This page uses a small 6 ft x 8 ft bathroom footprint with 300x600mm wall tiles — the layout gives 5 tiles across and 7 rows, for 35 tile positions before wastage, with wastage auto-suggested higher for both the small room size and the tile size.
Bathrooms combine two wastage-increasing factors at once — a small footprint and (often) large-format or plank tiles — which is why this page's suggested wastage runs higher than a similarly-sized but simpler room.
- Bathroom area in feet.
- Wastage auto-suggested higher for a small room.
- Tile boxes included.
How tile quantity is calculated
Tile quantity is calculated by first finding the floor or wall area, then the area covered by one tile. The calculator then uses a layout-based method to estimate full tiles, edge cut tiles, wastage, box count, and optional cost.
Step 1 - Calculate surface area
Area = Length x Width
Multiple Areas = Sum of every area's tiles above, combined into one total
Switching on Multiple Areas lets you combine floor, wall, or several rooms with different tile sizes and layout patterns in one run — each area keeps its own layout and wastage.
Step 2 - Calculate tile layout
Tiles per Row = Width / Tile Width
Rows Required = Length / Tile Length
Full Tiles = Tiles per Row x Rows Required
This checks how many tiles fit across the width and how many rows are needed along the length — a more practical estimate than area-only calculation.
Step 3 - Add edge cut tiles
Total Tile Positions = ROUND UP(Width / Tile Width) x ROUND UP(Length / Tile Length)
Base Tiles Required = Total Tile Positions (Full Tiles + Cut Tiles, including any corner tile)
Rounding each direction up (not down) before multiplying automatically counts a cut tile for any edge that doesn't divide evenly — including the corner tile where both the width and length edges need a cut at once.
If you enter an optional Grout Joint Width, it's added to both the tile size and the room dimension in each direction before rounding (Width / Tile Width becomes (Width + Joint) / (Tile Width + Joint)) — so the joint between tiles is included in the tile count itself, not just left as an area-only detail for the grout calculator. Leave it blank to count tiles edge-to-edge with no gap, which is what every worked example on this page uses.
Step 4 - Deduct fixed obstacles (optional)
Obstacle Tiles = ROUND UP(Obstacle Area / Tile Area)
Adjusted Full Tiles = Full Tiles - Obstacle Tiles (minimum zero)
A fixed obstacle (window, built-in wardrobe, kitchen island, pillar) whose footprint won't be tiled is deducted from the full-tile count only, not the edge cut tiles — this is an area-based approximation, the same simplification most calculators that support obstacle deduction make, since exact per-tile geometric exclusion would need the obstacle's on-floor position, not just its area.
Step 5 - Add wastage
Recommended Tiles = ceil(Base Tiles Required x (1 + Wastage / 100))
Wastage is auto-suggested from the layout pattern, room size, and tile size (small rooms and large-format tiles both push it higher) — always overridable.
Step 6 - Convert to boxes and cost
Boxes Required = ceil(Recommended Tiles / Tiles per Box)
Cost = Recommended Tiles x Price per Tile, or Boxes x Price per Box
Cost only appears when Enable Cost Estimation is switched on and a price is entered.
Real-World Tile Quantity Calculation Example
This example uses the active calculator inputs and follows the same steps from the formula section. Each table shows the value used, the formula or substitution applied, and the result produced by the calculator.
Input Values Used
| Input | Value |
|---|---|
| Tile work type | Wall |
| Wall Length | 6 ft |
| Wall Height | 8 ft |
| Tile size | 300 mm × 600 mm |
| Layout pattern | Straight grid (most common) |
| Wastage | 18% |
| Tiles per box | 6 |
Step 1 — Calculate Wall Area
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Wall Area | 6 ft × 8 ft | 4.46 m² (48.00 sq ft) |
Step 2 — Calculate Tile Layout
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Full tile positions (width / length) | FLOOR(8 ft ÷ 600 mm) | FLOOR(6 ft ÷ 300 mm) | 4 × 6 |
| Full tiles | 4 × 6 | 24 tiles |
| Total tile positions (rounded up) | ROUND UP(8 ft ÷ 600 mm) × ROUND UP(6 ft ÷ 300 mm) = 5 × 7 | 35 tiles |
| Cut tiles | Total Tile Positions − Full Tiles = 35 − 24Includes 1 corner tile — the width edge and the length edge are both cut, so the corner cell is cut on two sides at once, not a free extension of either edge strip. | 11 tiles |
| Base tiles required | Full Tiles + Cut Tiles | 35 tiles |
Step 3 — Add Wastage
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Wastage allowance | 35 × (18 ÷ 100) | 6.30 tiles |
| Extra tiles added | Recommended Tiles − Base Tiles Required | 7 tiles |
| Recommended tiles | Round up 41.30 | 42 tiles |
Step 4 — Convert to Boxes
| Calculation | Formula / Substitution | Result |
|---|---|---|
| Boxes required | 42 ÷ 6 | 7 boxes |
Therefore, for the current input values, the recommended tile purchase quantity is 42 tiles or 7 boxes including 18% wastage.
This page keeps things focused on the calculation above. For the full construction guide — verification checklist, reference tables, usage steps, tips, common mistakes, and limitations.See the complete Tile Calculator.
Related Calculators
Disclaimer: This calculator provides approximate results for planning and estimation purposes only. Actual requirements may vary based on site conditions, materials, workmanship, and local building regulations. Always consult a qualified engineer, architect, or construction professional before making final decisions.