Building Volume Calculator – Calculate Total Building Volume from Length, Width and Height

External dimension
External dimension
From ground level to roof top
Foundation depth (optional)
Total Building Volume
3 150.00 m³
3 150 000.00 liters
Volume Breakdown
Above ground volume: 2 400.00 m³
Below ground volume: 750.00 m³
Unit Conversions
Volume (m³): 3 150.00
Volume (liters): 3 150 000.00
Volume (ft³): 111,241.31
Volume (gallons US): 832,142.46
Volume (gallons UK): 693,243.15
Building Volume Calculation
Above Ground Below Ground Length Width Volume = Length × Width × (H₁ + H₂)

Building Volume Calculator

Calculate total building volume from external dimensions including above and below ground portions

Calculation Method

This calculator determines the total volume of a building by multiplying its external length, width, and combined height (above ground + below ground). The calculation treats the building as a rectangular prism and provides results in multiple units.

Volume = Length × Width × (Habove + Hbelow)

Where:

  • Length: External building length
  • Width: External building width
  • Habove: Above ground height (ground level to roof top)
  • Hbelow: Below ground height (foundation depth, optional)

Supported Units

The calculator supports both metric and imperial measurement systems:

  • Metric: meters (m), centimeters (cm), millimeters (mm)
  • Imperial: feet (ft), inches (in)

Results are automatically converted to cubic meters (m³), liters, cubic feet (ft³), US gallons, and UK gallons.

Calculation Examples

Example 1: Residential House (Metric)
Length: 12 m, Width: 8 m, Above: 7 m, Below: 2 m
Volume = 12 × 8 × (7 + 2) = 864 m³
Result: 864 m³ (864,000 liters)
Example 2: Small Office (Imperial)
Length: 40 ft, Width: 25 ft, Above: 12 ft, Below: 4 ft
Volume = 40 × 25 × (12 + 4) = 16,000 ft³
Result: 453.02 m³ (119,688 US gallons)
Example 3: Warehouse (Centimeters)
Length: 3000 cm, Width: 2000 cm, Above: 800 cm, Below: 0 cm
Volume = 30 × 20 × (8 + 0) = 4,800 m³
Result: 4,800 m³ (4,800,000 liters)
Example 4: Garage (Feet and Inches)
Length: 24 ft, Width: 180 in, Above: 10 ft, Below: 3 ft
Volume = 7.32 × 4.57 × (3.05 + 0.91) = 132.34 m³
Result: 132.34 m³ (4,674 ft³)
Example 5: High-rise Building
Length: 50 m, Width: 30 m, Above: 120 m, Below: 15 m
Volume = 50 × 30 × (120 + 15) = 202,500 m³
Result: 202,500 m³ (53,505,225 US gallons)
Example 6: Small Shed (Millimeters)
Length: 4000 mm, Width: 3000 mm, Above: 2500 mm, Below: 200 mm
Volume = 4 × 3 × (2.5 + 0.2) = 32.4 m³
Result: 32.4 m³ (32,400 liters)
Example 7: Commercial Building
Length: 80 ft, Width: 60 ft, Above: 25 ft, Below: 8 ft
Volume = 24.38 × 18.29 × (7.62 + 2.44) = 4,478 m³
Result: 4,478 m³ (158,173 ft³)
Example 8: Industrial Facility
Length: 100 m, Width: 75 m, Above: 18 m, Below: 5 m
Volume = 100 × 75 × (18 + 5) = 172,500 m³
Result: 172,500 m³ (45,576,975 US gallons)
Example 9: Single Story House
Length: 15 m, Width: 10 m, Above: 4.5 m, Below: 1.2 m
Volume = 15 × 10 × (4.5 + 1.2) = 855 m³
Result: 855 m³ (855,000 liters)
Example 10: Mixed Units Building
Length: 25 m, Width: 2000 cm, Above: 30 ft, Below: 72 in
Volume = 25 × 20 × (9.14 + 1.83) = 5,485 m³
Result: 5,485 m³ (193,732 ft³)
Note: The calculator uses external building dimensions and treats the structure as a rectangular prism. For irregular shapes or complex geometries, this provides an approximation of the total enclosed volume.