Convert bed dimensions into bags, bulk volume, and a mix plan before you buy soil.
Calculate cubic feet, cubic yards, bag count, and mix volumes for raised beds.
What this tool decides
Decides how much bed fill to buy and how the mix breaks down before soil settles.
Step 1
Set your inputs
Step 2
Calculate the number
Step 3
Read the plan
Layout inputs
Bag size
Mix ratio
Diagnostic panel
Total soil volume
32.0 cu ft
1.19 cubic yards for bulk ordering.
Mix breakdown
Topsoil
16.0 cu ft
Compost
9.6 cu ft
Aeration
6.4 cu ft
Bag estimate
16 bags
Based on 2 cubic foot bags. Round up if the bed settles after watering.
Read the plan
What it means
Cubic feet is the shopping number for bags; cubic yards is the ordering number for bulk deliveries.
Next action
Round up for settling, then use the mix bars to balance topsoil, compost, and aeration.
Risk note
Underfilled beds dry faster and dense mixes hold too much water after the first few irrigations.
Common mistakes
Length and width are not enough; depth decides most of the soil order.
Compost feeds the mix, but too much can settle, stay wet, and burn young roots.
Field note
Raised beds fail when the volume is guessed too low or the mix stays dense after watering. This calculator gives the cubic feet first; use that number with the fertilizing guide hub when compost, nutrients, or soil texture are the bigger decision.
A bag estimate is intentionally conservative because fresh soil settles. If you are filling a vegetable bed, check crop fit in vegetables before buying amendments that do not match the plants you plan to grow.