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hobby calculator
Estimate plants required and soil volume needed for your garden bed layouts.
Save this page to plan garden bed layouts and check soil yard needs before visiting your local nursery or garden center.
Total Plants Required
45
Formula
Grid: Cols × Rows. Staggered uses row height = Spacing × sqrt(3)/2. Soil Volume = Length × Width × (Depth / 12) / 27.Calculates grid layouts, staggered dense planting, and bulk soil cubic yards or bags.
Step by step
Related guides
Guide
A practical guide to estimating plant counts for raised beds using grid and offset (triangular) spacing models, and converting dimensions into soil volumes.
Site Guide
Learn how to use calculators on DotheCalculation, enter inputs, read results, explore formulas, and navigate between related tools for comprehensive planning.
Summary
Total Plants
45
Plants required for layout.
Cubic Yards
0.59 yd³
Bulk soil volume required.
Bags (2 cu ft)
8
Standard soil bags needed.
Bed Area
32 sq ft
Total surface planting area.
D3 visualization
Compare the number of bags required based on standard 1 cubic foot vs 2 cubic feet bag sizes.
Guide
Grid layouts align plants in straight vertical and horizontal columns. Staggered layouts (triangular packing) offset alternate rows. Staggering allows you to pack plants closer together, increasing yield by up to 10% in the same bed area.
For staggered spacing, the vertical distance between rows is calculated as: Spacing * sqrt(3) / 2 (approximately 86.6% of the plant spacing), which keeps all adjacent plants at the same exact distance.
Soil volume is calculated in cubic feet or cubic yards. To find volume, multiply the bed length by width to find area, then multiply by the depth (converted to feet).
Divide cubic feet by 27 to find cubic yards. Standard bagged soil is typically sold in 1 or 2 cubic feet bags. Sizing soil correctly prevents buying too many bags or running out mid-planting.
Triangular Packing
A staggered arrangement that maximizes space efficiency by packing circles in a triangular grid.
Cubic Yard
A unit of volume equal to a cube 3 feet on each side, standard for bulk soil orders.
Raised Bed Depth
The height of soil in a raised garden container, determining root growing space.
Staggered layouts arrange plants in triangles, reducing wasted empty space and increasing plant density without overcrowding.
Divide the total cubic feet by 27. For example, a 54 cubic feet raised bed requires 2 cubic yards of soil.
Most vegetables require 6 to 12 inches of soil depth. Root crops like carrots and potatoes need 12 to 18 inches.