How to Calculate Tile, Mortar, & Grout Quantities
Whether tiling a bathroom floor, kitchen backsplash, or shower surround, tile estimation depends on converting tile dimensions from square inches to square feet, factoring in edge cuts, pattern layout waste, and matching dye lots.
1. Individual Tile Area & Total Tile Count
Single Tile Area (sq ft)=
Tile Length (in) × Tile Width (in)144 (sq inches per sq ft)
;Tiles Needed=Gross Surface Area (sq ft)Single Tile Area (sq ft)
2. Thinset Mortar & Grout Bag Formula
50 lb Thinset Bags=
Gross Area (sq ft)Trowel Coverage (~45 sq ft / bag)
;25 lb Grout Bags=Gross Area (sq ft)Tile Grout Coverage (~100 sq ft / bag)
Step-by-Step Calculation Breakdown
Step 1: Calculate Net Area & 10% Waste (14 ft × 10 ft Floor)
Net Area = 14 ft × 10 ft = 140 sq ft
Gross Area with 10% Waste = 140 sq ft × 1.10 = 154 sq ft
Gross Area with 10% Waste = 140 sq ft × 1.10 = 154 sq ft
Step 2: Calculate 12″ × 24″ Large Format Tile Count & Cartons (15 sq ft/box)
Single Tile Area = (12 in × 24 in) ÷ 144 = 2.0 sq ft / tile
Individual Tiles Needed = 154 sq ft ÷ 2.0 = 77 Tiles
Boxes to Order (15 sq ft/box) = 154 ÷ 15 = 10.27 → 11 Boxes (165 sq ft total)
Step 3: Calculate Setting Materials (Thinset Mortar & Sanded Grout)
Setting Materials=4 Bags 50 lb Thinset Mortar + 2 Bags 25 lb Grout
Tile Size & Coverage Quick Reference Table
| Tile Size (Inches) | Area per Tile (sq ft) | Tiles per 100 sq ft | Typical Application |
|---|---|---|---|
| 3″ × 6″ Subway Tile | 0.125 sq ft | 800 Tiles | Kitchen backsplash, shower walls |
| 4″ × 4″ Square Ceramic | 0.111 sq ft | 900 Tiles | Classic tub surround, counter backsplash |
| 12″ × 12″ Standard Tile | 1.000 sq ft | 100 Tiles | Bathroom floors, laundry rooms, entryways |
| 12″ × 24″ Large Format | 2.000 sq ft | 50 Tiles | Modern bathrooms, kitchen floors, walk-in showers |
| 24″ × 24″ Extra Large Porcelain | 4.000 sq ft | 25 Tiles | Open-concept living rooms, commercial spaces |