Room Size Calculator
Calculate room floor area, baseboard perimeter, and cubic volume from length and width in feet, inches, meters, or yards with automatic unit conversions.
Room Dimensions & Unit
17.84 m² (21.33 sq yd)
Room Area, Perimeter & Volume Formulas
Area = Length × Width | Perimeter = 2 × (Length + Width) | Volume = Area × Ceiling Height- Floor Area (sq ft): Length (ft) × Width (ft). Used for flooring, carpet, tile, and area rugs.
- Room Perimeter (linear ft): 2 × (Length + Width). Used for baseboards, crown molding, and wall paint.
- Unit Conversions: 1 sq yard = 9 sq ft; 1 sq meter = 10.7639 sq ft; 1 foot = 12 inches = 0.3048 meters.
Step-by-Step Worked Example
Calculation Steps:
- Floor Area = 16 ft × 12 ft = 192.00 sq ft (21.33 sq yards / 17.84 m²)
- Room Perimeter = 2 × (16 + 12) = 56.00 linear feet (17.07 meters)
- Cubic Volume = 192 sq ft × 8 ft = 1,536.0 cubic feet (43.5 m³)
How to Use This Calculator
- 1Enter the room length and width and select your measurement unit (Feet, Meters, Inches, or Yards).
- 2Optionally enter the ceiling height to calculate room cubic volume for HVAC or air purifier sizing.
- 3View instant conversions in square feet, square meters, square yards, and linear perimeter.
Assumptions & Limitations
- Models rectangular room geometry; for L-shaped rooms, split the space into two rectangles and sum the areas.
- Perimeter represents gross wall perimeter before subtracting doorway openings.
Frequently Asked Questions
How do I convert inches into feet when measuring a room?
Divide inches by 12. For example, 14 feet 6 inches equals 14.5 feet (6 ÷ 12 = 0.5). You can also switch the unit dropdown directly to Inches.
Why does carpet pricing use square yards instead of square feet?
Many traditional carpet mills and installers price broadloom carpet by the square yard. Divide your room square footage by 9 to get square yards.
Why is room cubic volume useful?
Cubic volume (Area × Ceiling Height) is used to calculate Air Changes Per Hour (ACH) for HEPA air purifiers, bathroom exhaust fans (CFM), and HVAC load sizing.
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