CHU Calculator

Corn Heat Unit (CHU) Calculator

(1) Enter postal code for field location. (2) Move the green slider to set plant date. Results show total CHUs and Year-To-Year Comparisons change by date. (3) Move the brown sliders to set daily, weekly, monthly, or annual accumulations. (4) Click on any graph line for number estimates. (5) Click on any graph bar for daily details. (6) To view data in Growing Degree Units (GDUs), click the first slider button below.

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Pioneer Weather Information Disclaimer

This information is calculated using weather data provided by IBM and Pioneer makes no representations or warranties as to the accuracy or completeness of such data. The unique IBM Weather Forecast System provides more localized, more frequently updated, more consistent, and more accurate professional grade weather forecasts, with the added value of meteorologists being available for expert customer consultation during mission critical situations. This state of the art combination of computer technology and human experience consistently yields substantially improved results.

Please select field location
View Map Selector
Enter a start date
Enter a Comparative Relative Maturity (CRM)

Select Location From Map

View Data in GDUs

Graph Layers

Black Layer
Custom GDU/CHU Layer

Total Units Since

To Date




Versus Normal


Forecast (+14 Days)


Accumulated GDUs
Total Units
Individual GDUs
Total Units

Year-to-Year Comparisons From to

Season Total Units Compare to Normal
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