DIY & materials · Calculator companion · By K Imports
Aggregate & bulk bags: practical guide
This guide explains how to use the Count.ie aggregate & bulk bags. Estimate hardcore or gravel tonnes and 800 kg bags. Follow the inputs, method and worked example below, then compare your own scenario.
Guide written .
Open the Aggregate & bulk bags calculatorWhat to prepare
- Measure the actual space and record every dimension with its unit.
- Check the supplier's pack size, stated coverage and installation instructions.
- Separate the measured requirement from waste, cuts, overlaps and spare material.
Understand the inputs
The calculation method
Volume in m³ × supplied density × allowance factor; divide kilograms by bag mass and round upward.
Worked example
Illustrative inputs and their result.
Example inputs
- Length (m)
- 5
- Width (m)
- 4
- Depth (mm)
- 100
- Density (tonnes/m³)
- 1.6
- Extra allowance (%)
- 10
- Bulk-bag mass (kg)
- 800
Calculated example result
- Aggregate to order
- 3.52 t
- Bulk bags
- 5
- Volume incl. allowance
- 2.2 m³
How to interpret the result
The calculated quantity is a planning estimate, not an installation specification. Whole packs and site conditions can change the order; structural or safety-critical work needs appropriate professional guidance.
Compare alternative dimensions or pack sizes without changing the unit basis. Re-measure uncertain areas before buying, and use the manufacturer's instructions to decide a suitable allowance.
Common mistakes to avoid
- Convert millimetres, centimetres and metres before combining measurements.
- Do not add the same waste allowance at both measurement and ordering stages.
- Check irregular shapes, openings, substrate conditions and manufacturer coverage separately.
Assumptions and sources
The requested 1.6 t/m³ is an editable estimate, not a universal compaction standard. Confirm density, finished depth and actual bag mass with your supplier.
If your case falls outside this scope, use a more suitable calculator or contact us about an unclear method.