The calculation, without hidden assumptions
Raised beds are simple boxes geometrically but real projects may not be filled to the rim and may use more than one material. This worksheet separates bed volume, fill percentage, package count and an editable mix split.
How to use this calculator
Measure inside bed length, width and intended fill height.
Use fill percentage when logs, drainage layers or existing soil intentionally occupy part of the volume.
Set the compost fraction only as a purchasing split you have chosen, then match bag volume to the actual products.
Where people use it
- •Vegetable raised beds
- •Planter boxes
- •Two-component soil purchasing
Worked example
A 8 × 4 ft bed filled 10 in deep contains 26.67 ft³ before any partial-fill adjustment.
What the result does not assume
- •The mix percentage is not a universal recipe.
- •Settling may require a separate allowance depending on material.
Frequently asked questions
Can I account for a hugelkultur or filler layer?+
Yes, reduce the fill percentage to represent the portion actually occupied by purchased mix.
Does 30% compost suit every bed?+
No; the percentage is editable and should follow your chosen growing-medium plan.
Can I change the compost percentage?+
Yes. The split is intentionally editable so the calculator can match the soil recipe you have already chosen rather than prescribing one.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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