How Many Tiles Needed for a 5x8 Room (12"x24")?
Tiling a 5x8 Room (12"x24") requires 3 boxes (approx 22 tiles) based on standard 15 sq ft per box coverage and 10% cutting waste. This covers a net floor area of 40 sq ft (44 sq ft gross). You will also need 1 fifty-pound bags of modified thinset mortar and 1 twenty-five-pound bag(s) of grout.
Interactive Workstation & Complete Materials Takeoff
Reset to Blank Hub →Standard Small Bathroom Takeoff
Room Dimensions & Tile Specs
Client-side reactive engine. Adjust tile format and layout pattern for instant box calculations.
Tile Takeoff Schedule
| Material | Quantity | Unit | Est. Cost |
|---|---|---|---|
| Tile (12"×24") | 3 | boxes | $126 |
| ↳ Individual tiles | 22 | pieces | (44 sq ft w/ waste) |
| Cement Backer Board | 3 | sheets (3'×5') | $44 |
| Polymer Thin-Set | 1 | bags (50 lb) | $25 |
| Tile Joint Grout | 1 | bags (25 lb) | $22 |
| Leveling Clips/Wedges | 1 | pk (300 ct) | $29 |
Ready to Order or Hire Tile Setters?
Compare local tile installer estimates or export your complete materials checklist.
Material Takeoff & Accessory Checklist
Click any unit price to customize for your local supplier costs.
| Item / Specification | Category | Quantity | Unit Price | Total Est. | Supplier / Order |
|---|---|---|---|---|---|
Floor Tile (12" x 24" running-bond) Covers 15 sq ft per box. Includes 10% cutting/breakage allowance. | primary | 3 boxes (15 sf) | $126 | Home Depot | |
1/2" Cement Backer Board (3' x 5' Sheets) Rigid water-durable substrate for tile floors (HardieBacker or WonderBoard) | accessory | 3 sheets (15 sf) | $44 | Home Depot | |
Polymer-Modified Thin-Set Mortar (50 lb Bag) ANSI A118.4 / A118.11 bond strength for large format ceramic & porcelain tile | accessory | 1 bags (50 lb) | $25 | Home Depot | |
Sanded Polymer Tile Grout (25 lb Bag) Formula for 2/16" joints with stain defense and crack resistance | accessory | 1 bags (25 lb) | $22 | Home Depot | |
Tile Leveling Spacer Clips & Wedges (Pack of 300) Eliminates lippage and guarantees uniform grout joints across tiles | tool | 1 packs (300 ct) | $29 | Amazon | |
1-1/4" Corrosion-Resistant Backer Board Screws (Pack of 750) Ribbed countersinking screws for fastening cement board to subfloor | fastener | 1 boxes | $21 | Local Supplier |
Calculation Mechanics: Tile Coverage & Setting Materials
Formulas adhere to ASTM standards, ACI 318 guidelines, and standard construction estimating practice.
Step-by-Step Derivation Breakdown:
- 1Compute net room square footage: 8 ft × 5 ft = 40 sq ft.
- 2Calculate individual tile surface area: (12 in × 24 in) ÷ 144 = 2.000 sq ft per tile.
- 3Apply 10% cutting/pattern waste allowance: 40 sq ft × 1.10 = 44 gross sq ft.
- 4Calculate required tiles: 44 ÷ 2.000 = 22 individual tiles.
- 5Calculate purchase boxes: 44 gross sq ft ÷ 15 sq ft/box = 3 boxes.
- 6Calculate thinset mortar coverage: ~45 sq ft per 50-lb bag = 1 bags.
Field Inspection & Trade Best Practices
- For large format tiles (any side >15 inches), ANSI A108 standards require a minimum 95% mortar coverage in wet areas and 80% in dry areas. Back-buttering each tile is essential.
- Running bond patterns with large format tile should not exceed a 33% offset (1/3 overlap) to avoid excessive center lippage caused by natural tile crowning.
- Subfloor deflection must not exceed L/360 for ceramic and porcelain tile, and L/720 for natural stone installations.
Need a Licensed Subcontractor to Build This?
Request competitive estimates from insured, pre-screened Flooring & Tile trade contractors near your job site. Real quotes based on your exact calculated takeoff volume.
How This Takeoff Was Calculated
Step-by-Step Formula Breakdown:
Area = 8 ft × 5 ft = 40 sq ft. Gross Area (+10% waste) = 44 sq ft. Boxes = ⌈44 ÷ 15 sq ft/box⌉ = 3 boxes (22 tiles).
Frequently Asked Questions for Standard Small Bathroom
How many square feet of tile are in an average box?
Most residential porcelain and ceramic tiles are packed in boxes containing 10 to 15 square feet (typically 15 sq ft for 12x24 tiles, or 11 sq ft for 12x12 tiles).
Why should I add 15% waste for herringbone patterns?
Herringbone and diagonal layouts require 45-degree angle cuts at every single wall perimeter, leading to significantly higher triangle scrap cut-off compared to straight grid or 50% running bond layouts.
How much thinset mortar is needed per square foot?
Using a standard 1/2" x 1/2" square-notch trowel for large format tile, one 50-lb bag of polymer-modified thinset covers approximately 40 to 50 square feet.