Wall Square Footage
Calculate wall area from length and height. Supports Imperial and Metric. For paint, drywall, wallpaper.
Why This Construction Metric Matters
Why: Essential for paint, drywall, wallpaper ordering.
How: Area = Length × Height. Total = Area × Walls.
- ●1 sq ft = 0.0929 sq m
- ●Add 10–15% waste
- ●Subtract doors/windows for paint
📋 Quick Examples — Click to Load
Planning estimates only. Verify with a licensed engineer or contractor before construction.
📐 Construction Industry Facts
Area = Length × Height
— Geometry
~350 sq ft per gallon paint
— Manufacturer
Wall square footage = Length × Height. Essential for paint, drywall, wallpaper. 1 sq ft = 0.0929 sq m. One gallon paint ~350 sq ft; 4×8 drywall = 32 sq ft. Add 10–15% waste. Subtract doors and windows for paint.
Sources: NIST, paint manufacturer coverage, drywall specs.
Key Takeaways
- • Area = Length × Height; Total = Single wall × Number of walls
- • sq m = sq ft × 0.092903; sq ft = sq m × 10.7639
- • Add 10–15% waste for paint, drywall, wallpaper
- • Subtract doors (~21 sq ft) and windows for paint
Did You Know?
How Does It Work?
Area
Area = Length × Height. Measure floor to ceiling.
Multiple Walls
Total = Single wall area × Number of walls.
Conversion
sq m = sq ft × 0.092903. Enter feet or meters.
Expert Tips
Coverage by Material
| Use | Typical Coverage |
|---|---|
| Paint (1 gallon) | ~350 sq ft |
| Drywall (4×8) | 32 sq ft |
| Wallpaper (single roll) | ~56 sq ft |
| Standard door | ~21 sq ft |
Frequently Asked Questions
What is wall square footage?
Wall square footage is the area of a wall surface: Length × Height. Used for paint, drywall, wallpaper, and material estimation. Standard ceiling height 8–9 ft. Subtract doors and windows for paint/wallpaper.
How do I calculate wall area for painting?
Area = Length × Height. Subtract doors (~21 sq ft) and windows (~15–20 sq ft each). Add 10–15% for waste. One gallon covers ~350 sq ft (one coat).
How many drywall sheets do I need?
Standard 4×8 sheet = 32 sq ft. Divide total wall area by 32. Add 10% for waste. For 400 sq ft: 400/32 ≈ 13 sheets + waste ≈ 14–15 sheets.
How do I convert square feet to square meters?
1 sq ft = 0.092903 sq m. Multiply sq ft by 0.092903. Or: 1 sq m = 10.7639 sq ft.
Should I subtract doors and windows?
For paint and wallpaper: yes, subtract door and window areas. For drywall: typically no, as you still need full sheets. For insulation: subtract openings.
What is a typical room wall area?
12×12 room, 8 ft ceiling: 4 walls × 12×8 = 384 sq ft (minus one wall if open). Add 10–15% for waste when ordering materials.
Key Statistics
Official Data Sources
⚠️ Disclaimer: This calculator is for educational purposes only. Coverage varies by product. Verify with manufacturer.
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