Raised Bed Soil Calculator

How much soil do I need for a raised bed?

ft
ft
in
beds

Order this much raised bed soil

64cubic feet

Filled level. Soil settles, so expect to top up after the first season.

12 in deep8 ft × 4 ft× 2 beds
Per bed32 cu ft
In cubic yards2.5 cu yd
1.5 cu ft bags43 bags
Blend: topsoil 60%38.4 cu ft
Blend: compost 30%19.2 cu ft
Blend: aeration 10%6.4 cu ft

Enter your beds to see cubic feet, bags and a simple starter blend. Filling a bed from bags gets expensive quickly, so it is worth checking bulk too.

How it works

Length × width × depth for each bed. The blend splits the total into 60% topsoil, 30% compost and 10% aeration material.

Before you order

  • Plan for settling, and top up with compost each year.
  • Vegetables with deep roots appreciate 12 inches or more of soil.
  • Coarse logs or branches can take up space in very deep beds.

Common questions

What is the best soil mix for raised beds?

A common starting point is mostly quality topsoil, plenty of compost and some aeration material.

How many bags of soil fill a 4 × 8 bed?

At 12 inches deep it holds 32 cubic feet, or about 22 bags at 1.5 cubic feet.