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Trellis Calculator

Units

Dimensions

Material

Grid Spacing

Materials Needed

Total Linear Feet
126.0 ft
Support Posts
2
Cross Pieces
22
Fasteners/Ties
234
Estimated Cost
$326.70
Total Weight
189.0 lbs

Materials Needed

Posts2
Cross Pieces22
Fasteners234

Trellis Type Reference

TypeBest PlantsDifficultyDurability
A-FrameCucumbers, beans, peasMediumHigh
Flat/FanTomatoes, grapes, rosesEasyHigh
ObeliskClimbing flowers, beansMediumMedium
Cattle Panel ArchSquash, melons, beansEasyVery High
String/TwinePeas, beans, light vinesVery EasyLow
Lattice PanelClematis, ivy, jasmineEasyMedium

Trellis Building Tips

  • •Anchor posts at least 18-24 inches deep for stability and wind resistance
  • •Space plants 6-12 inches apart along the base for optimal coverage
  • •Consider weight capacity - mature plants with fruit can be surprisingly heavy
  • •Use weather-resistant materials or apply protective coating for outdoor use
  • •Install trellis before planting to avoid damaging roots later
  • •Regular maintenance and pruning help prevent trellis overload

Example Calculations

1Basic Tomato Trellis

Inputs

TypeFlat/Fan Trellis
Height6 feet
Width4 feet
MaterialWood
Grid Spacing6 inches
Quantity2 panels

Result

Total Linear Feet252 ft
Support Posts4 posts
Cross Pieces44
Fasteners468 screws
Estimated Cost$653.40

For two 6x4 ft tomato trellises with 6-inch grid spacing, you'll need approximately 252 linear feet of wood lumber (9 verticals and 13 horizontals per panel plus frame), 4 support posts (2 per panel), 44 cross pieces, and 468 screws for assembly. Total project cost is estimated at $653.

2Cucumber A-Frame

Inputs

TypeA-Frame Trellis
Height5 feet
Width3 feet
MaterialBamboo
Grid Spacing8 inches
Quantity1 panel

Result

Total Linear Feet81 ft
Support Posts4 posts
Cross Pieces13
Fasteners80 ties
Estimated Cost$247.00

An A-frame trellis provides support on both sides, perfect for cucumber vines. This 5x3 ft bamboo structure requires 81 linear feet of bamboo poles (4 posts, 4 rails, 5 verticals, and 8 horizontals), 4 posts for the frame, 13 cross pieces with 8-inch spacing, and 80 bamboo ties. The eco-friendly bamboo construction costs approximately $247.

3Budget Pea Trellis

Inputs

TypeString/Twine Trellis
Height4 feet
Width6 feet
MaterialWire/String
Grid Spacing4 inches
Quantity3 panels

Result

Total Linear Feet462 ft
Support Posts6 posts
Cross Pieces96
Fasteners1,482 clips
Estimated Cost$379.20

For three 4x6 ft pea trellises using economical wire/string, you'll need 462 linear feet of twine or wire (19 verticals and 13 horizontals per panel), 6 support posts, and 96 string sections creating a 4-inch grid perfect for pea tendrils. With 1,482 clips for securing the strings and a total cost of approximately $379.

Frequently Asked Questions

Q

How much material do I need for a trellis?

Material requirements depend on trellis type and size. For a basic 6x4 ft flat trellis with 6-inch grid spacing, you'll need approximately 40-50 linear feet of lumber or wire, 2 support posts, and 15-20 cross pieces. Use this calculator to get exact measurements for your specific design.

Q

What is the best spacing for a trellis grid?

Grid spacing depends on the plants you're growing. For small vines like peas, use 4-6 inch spacing. For larger plants like cucumbers or tomatoes, 6-8 inch spacing works well. Heavy crops like squash or melons benefit from 8-12 inch spacing for stronger support.

Q

How deep should trellis posts be buried?

Trellis posts should be buried at least 18-24 inches deep for stability, especially for tall or heavy structures. For 6-foot tall trellises, use 8-foot posts with 2 feet underground. In windy areas or for heavy crops, consider 30-36 inch depth.

Q

What is the strongest trellis material?

Metal (galvanized steel or aluminum) provides the strongest and most durable option, supporting heavy crops and lasting 15-20+ years. Treated wood offers good strength at lower cost with 10-15 year lifespan. PVC is lightweight and rot-resistant but less strong. Wire or string is economical but only suitable for light vines.

Q

How much weight can a trellis support?

Weight capacity varies by design and material. A well-built wooden flat trellis can support 50-100 lbs when properly anchored. A-frame and cattle panel arch designs handle 100-200 lbs. String trellises are limited to 20-30 lbs. Always anchor posts deeply and use appropriate materials for your crop weight.

Q

What type of trellis is best for tomatoes?

Flat or fan trellises work best for tomatoes, providing easy access for pruning and harvesting. A 6-8 ft tall structure with 6-8 inch grid spacing supports indeterminate varieties well. Use sturdy materials like 2x4 wood or metal rebar as tomato plants can become quite heavy when loaded with fruit.

See Also

  • Fence Calculator

    Calculate materials for garden fence projects

  • Raised Bed Calculator

    Design and plan raised garden beds

  • Lumber Calculator

    Estimate lumber quantities for projects

  • Greenhouse Calculator

    Plan greenhouse construction materials

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Last Updated: Feb 12, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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