Raised-bed compost calculator.
Measure the space you actually need to fill. Get the volume, material split and bag count without wrestling with unit conversions.
- Metric or imperial
- Multiple beds
- No signup
Total material to order
950 litres0.95 cubic metresMaterial split
What to order
570 litres · 0.57 m³
285 litres · 0.29 m³
95 litres · 0.1 m³
Bag comparison
If buying small bags
- 40 L bags
- 24
- 50 L bags
- 20
- 60 L bags
- 16
Or roughly 2 × 700 L bulk bags. Supplier bulk-bag volumes vary, so check the listing.
Not suitable for structural loading decisions.
Base volume before settlement: 864 litres. The result includes your 10% allowance and rounds bag quantities up.
Measure carefully
Use the internal dimensions.
Measure inside the boards, then enter only the depth that still needs filling. If a bed already contains 20 cm and you want 30 cm, the calculator orders the missing 10 cm—not the full frame.
Understand the estimate
Volume is firm. Weight is not.
The volume uses length × width × missing depth. The handling-weight range is deliberately broad because moisture, texture and compaction vary by product.