Square Footage Calculator
Calculate the area of a room or space for flooring, painting, or construction projects.
Results
120.00 sq ft
Square Meters
11.15 m²
Square Yards
13.33 sq yd
Acres
0.0028
Common Room Sizes
Area Formulas
Rectangle
Area = Length × Width
Circle
Area = π × Radius²
Triangle
Area = ½ × Base × Height
Trapezoid
Area = ½ × (Top + Bottom) × Height
Common Uses
- • Flooring: Calculate tiles, carpet, or hardwood needed
- • Painting: Estimate paint for walls and ceilings
- • Real Estate: Determine property or room sizes
- • Landscaping: Plan sod, mulch, or paving materials
- • Construction: Calculate materials for projects
Unit Conversions
| From | To | Multiply by |
|---|---|---|
| sq ft | sq m | 0.0929 |
| sq ft | sq yd | 0.1111 |
| sq ft | acres | 0.000023 |
| sq m | sq ft | 10.764 |
Average Room Sizes Guide (US Standard)
Use these typical dimensions as a starting point when planning renovations, comparing rental listings, or estimating material costs:
| Room Type | Small | Average | Large | Avg Sq Ft |
|---|---|---|---|---|
| Living Room | 10×12 | 14×18 | 18×22 | ~252 sq ft |
| Master Bedroom | 10×12 | 12×14 | 14×18 | ~168 sq ft |
| Secondary Bedroom | 8×10 | 10×12 | 12×14 | ~120 sq ft |
| Kitchen | 8×10 | 12×15 | 14×20 | ~180 sq ft |
| Dining Room | 10×12 | 12×14 | 14×18 | ~168 sq ft |
| Full Bathroom | 5×7 | 7×9 | 8×12 | ~63 sq ft |
| Half Bathroom (Powder) | 3×6 | 4×6 | 5×7 | ~24 sq ft |
| Home Office | 8×10 | 10×12 | 12×16 | ~120 sq ft |
| 1-Car Garage | 12×22 | 14×24 | 16×24 | ~336 sq ft |
| 2-Car Garage | 18×20 | 20×22 | 22×24 | ~440 sq ft |
Material Estimator: Flooring & Paint
Flooring Material
- Calculate room area (L × W)
- Add 10% for waste (15% for diagonal)
- Divide by coverage per box/roll
- Always round up
| Material | Coverage | Waste % |
|---|---|---|
| Hardwood / Laminate | ~20 sq ft/box | 10–15% |
| Vinyl plank (LVP) | ~20 sq ft/box | 10% |
| Ceramic tile (12×12) | varies | 10–15% |
| Carpet (roll, 12 ft wide) | per linear ft | 10–20% |
Paint Coverage
One gallon of interior paint covers 350–400 sq ft per coat. Most rooms need 2 coats.
- Total wall area: (L+W) × 2 × height
- Subtract 20 sq ft/door, 15 sq ft/window
- Divide by 350 sq ft/gallon
- Multiply by 2 for two coats
12×14 ft room, 9 ft ceiling:
Walls: (12+14)×2×9 = 468 sq ft
−1 door −2 windows = −50 sq ft
Net: 418 ÷ 350 × 2 = 2.4 gallons → buy 3
Walls: (12+14)×2×9 = 468 sq ft
−1 door −2 windows = −50 sq ft
Net: 418 ÷ 350 × 2 = 2.4 gallons → buy 3
What Is Normal? House Sizes Around the World
| Country | Avg New Home | Sq Meters | Context |
|---|---|---|---|
| Australia | ~2,450 sq ft | ~228 m² | World's largest homes per capita |
| United States | ~2,300 sq ft | ~214 m² | Growing since 1970s (avg was 1,500 sq ft) |
| Canada | ~1,950 sq ft | ~181 m² | Dense urban areas trending smaller |
| New Zealand | ~1,800 sq ft | ~167 m² | Similar to Canada |
| France | ~1,200 sq ft | ~112 m² | Apartments common in major cities |
| Germany | ~1,100 sq ft | ~102 m² | High renter population, smaller ownership |
| United Kingdom | ~820 sq ft | ~76 m² | Smallest among English-speaking developed nations |
| Japan | ~700 sq ft | ~65 m² | Urban density drives compact design |
| Hong Kong | ~450 sq ft | ~42 m² | World's densest housing market |