Room Size Calculator
Length (m)
Width (m)
Height (m)
A room size calculator determines floor area, wall area, and volume. Essential for flooring, paint, wallpaper, and HVAC system sizing.
- 1Floor area = Length × Width
- 2Wall area = 2 × (Length + Width) × Height
- 3Volume = Length × Width × Height
- 4For paint: deduct doors/windows (~20%); divide by coverage per litre
4.5m × 3.5m room, 2.4m ceiling=Floor: 15.75m²; Walls: 38.4m²; Volume: 37.8m³
| Material | Coverage/unit | Estimate for 20m² floor |
|---|---|---|
| Flooring | 1:1 | 20m² + 10% wastage |
| Emulsion paint | 10–12m²/litre | ~2L walls (one coat) |
| Wallpaper roll | ~5.4m² | ~4 rolls for 4 walls |
| Carpet | 1:1 | 20m² + 5% wastage |
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