Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Simple mean-temperature method without high/low caps. Crop-specific bases and threshold conventions must be selected externally.
Example Calculation
- Daily minimum: 10 °C
- Daily maximum: 20 °C
- Base temperature: 5 °C
Daily minimum = 10; Daily maximum = 20; Base temperature = 5. Primary result: 10.
Frequently asked questions
How do I use this calculator?
Enter daily minimum, daily maximum, base temperature. The result updates automatically. Use Reset to restore the example values.
What method does it use?
GDD=max(0,(Tmin+Tmax)/2−base).. Simple mean-temperature method without high/low caps. Crop-specific bases and threshold conventions must be selected externally.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.