How Much Soil for a 3x6 Raised Bed?

Soil volume and bag counts for a 3×6 raised bed, with a worked example at 10-inch depth.

Quick answer

Soil(ft³)=6×3×(depth_in/12). At 10" depth: depth_ft=0.8333 → soil = 15 ft³. Bags(2 ft³) = ceil(15/2)=8; bags(3 ft³)=ceil(15/3)=5.

Worked example

Depth 10": depth_ft=10/12=0.8333. Soil_ft³=6×3×0.8333=15.0. Soil_yd³=15/27=0.5556.

Real beds often have a layered fill (sticks, leaves, compost). That changes how much bagged “soil” you buy, even if the geometric volume is the same.

Use the calculator Opens prefilled state.

How many 2 cu ft bags for a 3x6 bed at 10 inches?

15 ft³ total → 8 bags (ceil).

Why does the math show exactly 15 ft³?

6×3×(10/12)=18×0.8333=15.

How many cubic yards is 15 ft³?

15/27=0.5556 yd³.

Is 10 inches deep enough for a raised bed?

It can work for many greens and shallow-root crops, but 12 inches is a safer default for mixed planting and summer heat.

Estimates only. If you need accuracy, validate depth, compaction, and spacing with your local guidance.