How to use this calculator
- 01Measure the treatment area.
- 02Enter the intended settled depth.
- 03Set the bag volume and an allowance, then round the order to available delivery increments.
Assumptions and limitations
What the estimate assumes
- The entered depth is uniform.
- Material is measured as loose volume.
- No subtraction is made for plants, roots, rocks, or existing fill.
What it does not determine
- Soil can compact substantially after watering.
- Volume alone does not determine soil suitability.
- Check soil test results, drainage, and supplier composition before use.
Frequently asked questions
Is topsoil calculated differently from compost?
The volume formula is the same. Density, compaction, appropriate depth, and intended use differ, so confirm those with the supplier.
How much extra should I order?
The correct allowance depends on compaction, site access, and grade. The calculator lets you choose rather than assuming one value.
Can I use this for raised beds?
Yes, for a simple footprint and uniform fill depth. Subtract large internal voids separately.