GARDEN VOLUME
Topsoil & compost calculator
Convert a measured bed area and depth into topsoil or compost volume and a bag count, with the waste allowance and the full calculation shown. This is an estimated requirement—not a purchase, safety, engineering or code-compliance instruction.
Build your estimate
Choose a unit system. Switching units converts the values already entered.
Estimated requirement
Enter measurements and calculate.
- How it was calculated
- Your formula will appear here.
- Assumptions
- Waste and package assumptions will appear here.
- What may change it
- Soil and compost settle and may be sold by loose volume. Product suitability, amendment rate and final depth are site-specific.
Worked example
A 100 ft² bed at 4 in depth is about 1.23 yd³ before allowance.
Check the product label and supplier before ordering. Measured conditions, layout, cuts, compaction, site preparation and local requirements may change your actual requirement.
Read the methodology →