Type 1 Calculator

By CalculatorBolt Team | Published: Jan 15, 2025 | Updated: Jan 15, 2025 | Reviewed by: Construction Engineering Editor

Calculate Type 1 sub-base volume and weight. Enter area and depth, get volume in cubic meters, cubic yards, and weight in tonnes. Informational only—verify with suppliers.

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Calculate Type 1 Volume

Area = Length × Width
Typical: 150-200 mm (6-8 inches)
Typical: 5-10%
Typical: 2200 kg/m³ (137 lb/ft³)

How it Works

Volume = Area × Depth. We calculate volume in m³, apply an optional waste factor, and convert to cubic yards. If you provide a Type 1 density, we also estimate weight.

Inputs Explained

  • Area & Depth: Enter area (length × width) and sub-base depth with units.
  • Volume Direct: Enter total volume needed and units directly.
  • Waste Factor: Optional; typically 5-10% for over-ordering and compaction.
  • Type 1 Density: Optional; for weight estimation (default 2200 kg/m³).
  • Output Units: Choose metric (m³, tonnes) or imperial (cu yd, tons) display.

Example

Given:

  • Area: 50 m²
  • Depth: 150 mm (0.15 m)
  • Waste Factor: 5%
  • Density: 2200 kg/m³

Calculation:

Volume = 50 × 0.15 = 7.5 m³

Adjusted (5% waste) = 7.5 × 1.05 = 7.875 m³

Weight ≈ 7.875 × 2200 = 17,325 kg = 17.33 tonnes

Result: 7.88 m³ (10.30 cu yd), 17.33 tonnes

Tips & Notes

  • Add a waste factor (5–10%) for over-ordering and compaction.
  • Type 1 density varies; use a local supplier's value for accurate weight estimates.
  • Use the preset buttons for common bay sizes.
  • Typical sub-base depth for driveways: 150-200 mm (6-8 inches).
  • Compact Type 1 in layers (max 100mm per layer) for best results.

FAQs

A granular sub-base layer used under surfaces like pavements. Typical depth is 150–200 mm.

Around 2,200 kg/m³. Adjust based on your supplier's data.

It supports both. Choose your units for inputs and outputs.

Calculate area (length × width) and multiply by depth (typically 150-200mm). Add 5-10% waste factor.

MOT Type 1 is a UK-specific specification. Type 1 is a more generic term used internationally for sub-base aggregate.

Yes. Adjust the density value to match your specific sub-base material (e.g., crushed stone, recycled aggregate).

Compact in layers no thicker than 100mm. Use a vibrating plate compactor. Aim for 95% compaction density.

Waste factor accounts for material loss during handling, compaction reducing volume, and irregular excavation shapes.

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