Inputs
Note: Tonnes are estimated from typical bulk densities. Actual weights vary by moisture content and supplier.
Results
Enter your dimensions then click Calculate.
UKUK Building Regulations
References & Sources
Standards Cited
- BS EN 12620 — Aggregates for concrete
Defines aggregate properties, grading, and density values for concrete aggregates (gravel, sand, crushed stone) - BS EN 13242 — Aggregates for unbound and hydraulically bound materials for use in civil engineering work and road construction
Specification for MOT Type 1 sub-base and other unbound aggregates used in the calculator
Formulas Used
- Volume:
volumeM3 = length x width x depth
Source: Basic geometry - Weight from volume:
tonnesRequired = volumeM3 x density / 1000
Source: BS EN 12620 / BS EN 13242 — Densities: gravel 1600, sand 1600, crushed stone 1600, MOT Type 1 2000, ballast 1750 kg/m3 - Bulk bags:
bulkBags = ceil(volumeM3 / 0.75)
Source: Industry standard bulk bag size (0.75 m3)
Key Assumptions
- Material densities: gravel 1600 kg/m3, sand 1600 kg/m3, crushed stone 1600 kg/m3, MOT Type 1 2000 kg/m3, ballast 1750 kg/m3 — BS EN 12620 / BS EN 13242
- Bulk bags assumed to hold 0.75 m3 each — Industry standard bag size
- Loose bags assumed to be 25kg each — Industry standard bag size