Garden & Outdoor calculator
What Trellis Size Do I Need?
Use mature plant width, mature plant height, training margin each side to find trellis size.
Enter your measurements
What Trellis Size Do I Need uses mature plant width, mature plant height, training margin each side and the other configured measurements to return trellis size with a formula written specifically for this tool.
- Mature plant width — Required
- Mature plant height — Required
- Training margin each side — Required
- Top margin — Required
Trellis size
Enter the measurements above to calculate trellis size.
How the calculation works
V9 calculation: trellisWidth=plantMatureWidth+2×sideTrainingMargin; trellisHeight=plantMatureHeight+topMargin. The result is reported as trellis size.
Worked example
Example: Mature plant width = 60 cm; Mature plant height = 100 cm; Training margin each side = 30 cm; Top margin = 5 cm. Result: Trellis Height = 105 cm; Trellis Width = 120 cm.
Before you decide
Enter the dimensions that will exist in real use, not an approximate catalogue category. This page calculates the stated geometry or quantity only; product-specific construction or installation details can still affect the final choice. For what trellis size do i need, the limiting result on this page is trellis size.
Direct measurement/geometry calculation. No external reference is required for the arithmetic itself; the result is derived only from the user-entered measurements and the formula stored in calculationLogicJson.
Frequently asked questions
What does the Trellis Size calculator tell me?
It returns trellis size from the measurements entered on this page. The calculation is specific to trellis size, so the result should be compared with the exact product or specification you are considering.
Which measurements should I take for trellis size?
Measure mature plant width, mature plant height, training margin each side, top margin. Use clear, usable dimensions rather than nominal room or product labels.
Should I round the trellis size?
Keep the calculated value for comparison, then choose a real product that meets or stays within the returned trellis size while allowing for the clearances, tolerances or ratings shown by its manufacturer.