Garden Bed Size Calculator
Plan a garden bed for a household, sizing it to the vegetables and herbs you want to grow.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Choose one of the calculator’s per-person growing-area assumptions, then estimate bed count, length and a simple path footprint. Beds are split into runs no longer than about 12 ft. The footprint assumes parallel beds with one path-width strip at each outer edge and between beds; actual layouts need a site plan.
Worked example
calculated with the default values below
People in the household 4 · How much you want to grow Moderate supply (100 sq ft per person) · Bed width 4 ft · Path width between beds 1.5 ft Growing area needed 400 sq ft · Length of each bed after splitting 11.1 ft · Suggested number of beds 9 · Total footprint including paths 567 sq ft · Note At this width you can reach the middle from either side without compacting the soil
General background references
Disclaimer
These are general gardening estimates. Planting windows, growth, water and nutrient needs vary by place and plant. Check local extension guidance and product labels before acting on an estimate.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
A=n×p; L=A÷w; b=max(1,ceil(L÷12)); ell=L÷b; F=A+(b+1)×q×ell
- n
- people
- p
- selected area per person (sq ft)
- w
- bed width (ft)
- b
- number of beds
- ell
- length per bed (ft)
- q
- path width (ft)
- F
- estimated footprint (sq ft)
The path estimate assumes parallel beds no longer than about 12 ft, with one path-width strip between each bed and one along each outer edge. It omits other layout details.
Frequently asked questions
How is the path footprint estimated?
With four people at the moderate setting, the model assigns 400 sq ft of growing area. At 4 ft bed width this makes 100 ft of total bed length, split into 9 beds about 11.1 ft long. Ten path strips (one outside each edge and one between each bed) at 1.5 ft add about 166.7 sq ft, for a total footprint of about 567 sq ft. This assumes straight parallel beds.
How does the footprint estimate account for paths?
The calculator divides the chosen growing area into beds no longer than about 12 ft, then adds an approximate path allowance based on your selected path width. It is a layout starting point; actual footprint depends on how beds and shared paths are arranged.