DIY & materials
Gravel and Hardcore Tonnage Calculator
Estimate hardcore or gravel tonnes and 800 kg bags. This free gravel and hardcore tonnage calculator shows the calculation and its assumptions so you can compare your own figures.
Your results
Estimate hardcore or gravel tonnes and 800 kg bags.
Calculated outcomes
- Area M2
- 20 m²
- Volume M3
- 2 m³
- Order Volume M3
- 2.2 m³
- Bag Kg
- 800 kg
Assumptions and estimates
- 1.6 tonnes/m³ is the requested editable planning density, not a universal compacted material standard. The entered allowance applies to volume. Confirm density, compaction, finished depth and actual 800 kg bag contents with the supplier.
- Method: Volume in m³ × supplied density × allowance factor; divide kilograms by bag mass and round upward.
- 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.
Useful next steps
- Use Compare options to test an alternative side by side.
- Copy, print or download a record of this calculation when you need one.
Reports open your email app addressed to s@s1.ie with the public page address only. Your inputs are never added.
How the aggregate & bulk bags calculation works
Volume in m³ × supplied density × allowance factor; divide kilograms by bag mass and round upward.
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.
Using this calculator
- Enter your own figures in the labelled inputs. Keep the currencies, units and time periods consistent.
- Choose any applicable rate profile, pattern or assumption shown for this tool. Open additional inputs when relevant.
- Review tonnes and bulk bags, then read the stated assumptions and eligibility conditions before using the result.
Worked example
This is a static example using illustrative inputs, not facts about you or today’s date. The displayed eligibility selections and assumptions apply only to this example.
See example inputs
- Length (m)
- 5
- Width (m)
- 4
- Depth (mm)
- 100
- Density (tonnes/m³)
- 1.6
- Extra allowance (%)
- 10
- Bulk-bag mass (kg)
- 800
- Tonnes
- 3.52 t
- Bulk Bags
- 5