Inputs
Tip: for a slab thickness in mm, set unit to mm and enter thickness as height.
Results
Enter dimensions then click Calculate.
UKUK Building Regulations
References & Sources
Standards Cited
- SI Brochure (9th edition) — The International System of Units
Defines the cubic metre (m³) as the SI derived unit of volume View → - BS EN 1991-1-1 — Eurocode 1: Actions on structures — Part 1-1: Densities, self-weight, imposed loads for buildings
Source of standard material densities used in weight-from-volume calculations (e.g., reinforced concrete 2500 kg/m³, steel 7850 kg/m³)
Formulas Used
- Cuboid Volume:
V = length x width x height
Source: Standard geometry - Cylinder Volume:
V = pi x r² x h
Source: Standard geometry - Sphere Volume:
V = (4/3) x pi x r³
Source: Standard geometry - Cone Volume:
V = (1/3) x pi x r² x h
Source: Standard geometry - Pyramid Volume:
V = (1/3) x base_length x base_width x height
Source: Standard geometry - Excavation Bulking:
Bulked volume = excavated volume x bulking factor
Source: Construction industry practice — Default bulking factor of 1.2 (20%) used for general excavation - Volume from Weight:
V = weight / density
Source: BS EN 1991-1-1 - Tank Capacity (litres):
Litres = volume_m³ x 1000
Source: SI unit definitions - Tank Capacity (UK gallons):
UK gallons = litres / 4.54609
Source: Weights and Measures Act 1985
Key Assumptions
- Reinforced concrete density of 2500 kg/m³ — BS EN 1991-1-1 Table A.1
- Plain concrete density of 2300 kg/m³ — BS EN 1991-1-1 Table A.1
- Softwood timber density of 500 kg/m³ — BS EN 1991-1-1 Table A.3
- Default bulking factor of 1.2 (20%) for excavated soil — Construction industry standard practice
- 1 UK gallon = 4.54609 litres — Weights and Measures Act 1985