Grapevine Planting Calculator
Grapevine count, harvest weight, and trellis posts from row size.
What it does
Grapevines live decades, so spacing is a long bet. Eight foot gaps suit vigorous wine grapes with room for sun and air.
The tool above divides row by spacing. One hundred feet at 8 ft plants 13 vines for about 156 lb, with 6 trellis posts. The metric match is 30 m at 2.4 m for 13 vines and 70 kg.
Harvest follows maturity. Young vines trickle for two years, then climb toward a dozen pounds each under good pruning.
Posts frame the row. Line posts every 24 ft with stout ends carry wire tension through wind and crop weight.
Variety picks the table. Wine, juice, and table grapes prune and thin differently, so match spacing to vigor.
How to use
- Pick imperial (ft) or metric (m).
- Enter row length.
- Enter spacing: 8 ft or 2.4 m suits wine grapes.
- Read vines first.
- Read harvest next.
- Read posts and order early.
Formula
- row
- Trellis row length.
- spacing
- Vine to vine gap.
Metric spaces 1 to 5 m with 5.4 kg per vine and posts every 7.32 m. Half way rows round up to full vines.
Worked example
Example: 100 ft row, 8 ft spacing
Imperial defaults: 100 ft row at 8 ft spacing. These are also the default values, so the page opens on this answer.
- Row: 100 ft at 8 ft spacing.
- Vines: round(100 / 8) = 13 vines (12.5 rounds up).
- Harvest: 13 x 12 = 156 lb.
- Posts: ceil(100 / 24) + 1 = 6 posts.
- Tool shows 13 vines, 156 lb harvest, 6 posts.
Reference table
| Row | Vines | Harvest |
|---|---|---|
| 50 ft | 6 vines | 72 lb |
| 100 ft | 13 vines | 156 lb |
| 200 ft | 25 vines | 300 lb |
| 30 m | 13 vines | 70 kg |
Limits
- Count math only. Variety rules harvest.
- Young vines trail mature yields.
- Frost and pests shift results.
- Wires and training need plans.
Common mistakes
- Tight spacing for vigorous vines.
- Counting first year harvests.
- Weak end posts under wire load.
- No bird netting at veraison.
- Planting tender varieties in cold zones.
Try it yourself
Quick checks. Answers sit tucked under each question.
50 ft at 8 ft?
round(50 / 8) = 6 vines (6.25 rounds down). Harvest is 6 x 12 = 72 lb. Posts are ceil(50 / 24) + 1 = 4 posts.
60 m at 2.4 m metric?
round(60 / 2.4) = 25 vines. Harvest is 25 x 5.4 = 135 kg.
Questions
Vines for 100 ft?
Divide row by spacing and round. Here round(100 / 8) = 13 vines.
Harvest per vine?
Near 12 lb (5.4 kg) per mature vine in this plan. Young vines trail it for years.
Total harvest?
Multiply vines by 12 lb. Here 13 x 12 = 156 lb.
Trellis posts?
Divide row by 24 ft post gaps, round up, plus one end post. Here ceil(100 / 24) + 1 = 6 posts.
Variety matter?
Yes. Variety, pruning, and frost shift real harvests past vine counts.
Pest plans included?
No. Sprays and netting need vineyard plans.