GDU Calculator
Calculate Growing Degree Units (GDU) or Growing Degree Days (GDD) to track plant and crop development rates.
Input Parameters
Enter details for calculation.
Growing Degree Units
Expert Tip
Corn growth is closely linked to daily GDU accumulation. Standard hybrid corn requires around 1200 GDUs to silking and 2700 GDUs to full grain maturity.
Calculation Methodology & Details
Formula
MaxTemp is capped at the Upper Cutoff, and MinTemp is set to BaseTemp if it drops below it. This models biological activity bounds where extreme heat or cold stalls growth.
Important Disclaimer
The calculations provided are for educational and general planning guidelines only. They do not replace professional agronomic advice or certified agricultural testing.
How to Calculate Growing Degree Units
Follow these steps to calculate GDU values:
Record Daily Temperatures
Obtain the high and low temperatures for the day.
Apply Plant Thresholds
Adjust temperatures to match base (usually 50°F / 10°C) and cutoff limits.
Average and Subtract
Calculate average adjusted temperature, and subtract base temperature.