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Soil Calculator

Work out how much topsoil or garden soil you need and what it will cost. Choose a rectangular or circular bed, enter the size and soil depth (presets for 6″, 8″ and 12″), then set a compost blend and settling allowance, the bag size and price. You'll get the cubic yards, the topsoil and compost split, bags, cost per square foot and total, plus a full breakdown, by-depth and by-compost-blend comparison tables, a chart, and a downloadable PDF report.

Estimate only. Volume = area × depth ÷ 27 cubic yards (circle area = π × (diameter ÷ 2)²); bags = volume ÷ bag size. The compost blend splits the volume into topsoil and compost. Soil settles and compresses, so order a little extra and top up after watering. It is sold bulk by the cubic yard and in bags for small jobs — one cubic yard is about 18 bags of 1.5 cu ft. Confirm the mix and price with your supplier.
1 Bed shape & size
Rectangle
Circle
ft
ft
×
%
Rectangle area = length × width × number of beds.
2 Depth & blend
6″
8″
12″
in
%
Volume = area × depth, in cubic yards. The blend splits it into topsoil and compost; bags assume the size you set below.
3 Bag & cost
cu ft
$ /yd³
$
Soil is sold by the cubic yard for bulk and by the bag for small jobs. One cubic yard is about 18 bags of 1.5 cu ft. Confirm the price and mix with your supplier.
Soil needed
— cu yd
Enter the bed and depth, then click Calculate
Bags
—
if bagged
Compost
—
of the blend
Total cost
—
soil + delivery
Soil summary
—
Enter the bed
We work out the bed area, multiply by the depth for the volume, add settling, then convert to cubic yards, split the blend into topsoil and compost, and work out bags and cost.
Soil breakdown
Bed area—
Shape—
Number of beds—
Soil depth—
Settling allowance—
Volume—
Total cubic yards—
Topsoil—
Compost—
Bags—
Price per cu yd—
Total material cost—
Result summary
Total volume —
Bags —
Total cost —
Bed area —
Compost —
Cost per sq ft —
By soil depth
DepthCubic yardsBagsTotal cost
Enter the bed to compare
By compost blend
Compost blendTopsoil (cu yd)Compost (cu yd)Bags
Enter the bed to compare
Visualizations
Cubic yards by soil depth (highlighted = your depth)