Trellis
Plan posts, wire and area for a garden trellis.
About Trellis
Trellis posts are spaced along the row plus one end post, and each horizontal wire run spans the full row length. Vertical growing on a trellis crams more plants into less ground and improves air flow, but only with enough posts to stay standing.
Formula
Trellis
Posts = row length ÷ post spacing + 1; wire = row length x wire runs
- wire runs
- Number of horizontal support wires per post line
Worked example
With the default values below, Trellis returns Posts Needed of 5. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Row lengthminimum 0 ft
- 25 ft
- Post spacingminimum 1 ft
- 8 ft
- Trellis heightminimum 1 ft
- 6 ft
Results
- Posts Needed
- 5 posts
- Wire Length (3 runs)
- 75.0 ft
- Trellis Area
- 150.0 sq ft
Step by step
- 1Values used
- 2Trellis
- 3Posts Needed= 5 posts
- 4Wire Length (3 runs)= 75.0 ft
- 5Trellis Area= 150.0 sq ft
Assumptions and limits
- The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- Figures are rounded for display to 1 decimal place, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
Frequently Asked Questions
How is Trellis calculated?
Posts = row length ÷ post spacing + 1; wire = row length x wire runs Trellis posts are spaced along the row plus one end post, and each horizontal wire run spans the full row length.
Why does Trellis matter?
Vertical growing on a trellis crams more plants into less ground and improves air flow, but only with enough posts to stay standing.
What values do I need to enter?
This calculator takes 3 inputs: Row length, Post spacing, Trellis height. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.