Spike's Calculators

The **harvest cluster weight method** is based on the number of producing vines per hectare, the average number of clusters per vine, and the average cluster weight at harvest from previous years to predict the yield in tons per hectare for the current season.

The **lag phase cluster weight method** is based on the number of producing vines per hectare, the average number of clusters per vine, and the average cluster weight at the lag phase state of the grape with the use of a multiplier to predict the yield in tons per hectare for the current season. Cluster weights will double from lag phase to harvest time. The multiplier in this calculator is set at 2 but this number can vary depending on various factors.

*Sampling method and amounts of samples taken to obtain averages is beyond the scope of this calculator. Accuracy counts!*

- Select your method
- The multiplier in this calculator is set at 2 but can be changed. It only comes in play when using the lag phase method
- Row spacing in metres
- Vine spacing in metres. 3 and 4 will determine number of vines per hectare
- Enter the number of non bearing or missing vines
- Enter the average amount of clusters per vine
- Enter the average weight of these clusters in grams

The result of the calculation will be the yield in tons per hectare of the grape crop.

- Odd Shaped Vineyard - Imperial
- Odd Shaped Vineyard - Metric
- Vines needed to plant an area
- Vines per Acre Calculator
- Vines per Hectare Calculator
- Grape Vines per Area with Multiple Blocks
- Grape Vines per Area with Multiple Blocks - Metric

- Growing Degree Days (GDD)
- Predicting Wine Grape Crops - Imperial
- Predicting Wine Grape Crops - Metric
- Converting Celsius GDD to Fahrenheit GDD
- Grapes per Hectare/Acre
- Grape Yield and Wine Production - Metric
- Grape Yield and Wine Production
- Grape Yield and Wine Production
- Calculating Number of Acres Planted from Vines Planted