Garden & outdoors
Raised bed fill calculator
Account for internal dimensions and unfilled space at the top.
A clear answer. Here’s how.
Uses internal length × width × (height − top gap). Converts cubic centimetres to litres and cubic metres, then rounds to whole bags. The gap must be smaller than the height. Layering, drainage and soil settlement are excluded.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Internal length (cm)
- 180
- Internal width (cm)
- 90
- Internal height (cm)
- 40
- Unfilled top space (cm)
- 5
- Bag volume (litres)
- 40
Example result
- Volume
- 567 litres
- Cubic metres
- 0.567
- Whole bags
- 15