Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Climate
Growing Degree Days Calculator
Compute daily Growing Degree Days (GDD) by subtracting a crop-specific base temperature from the average of the day's max and min temperatures. Use accumulated GDD to predict crop development stages.
Fill in the required fields to see your result.
Climate
Evapotranspiration Calculator
Estimate monthly potential evapotranspiration (PET) from average temperature, daylight hours, and days in the month using a simplified Thornthwaite-style formula. Returns millimetres of water lost per month.
Fill in the required fields to see your result.
Key differences
| Growing Degree Days Calculator | Evapotranspiration Calculator | |
|---|---|---|
| Category | Climate | Climate |
| Inputs required | 3 | 3 |
| Result | Growing Degree Days (GDD) | Potential Evapotranspiration (mm/month) |
| What it does | Compute daily Growing Degree Days (GDD) by subtracting a crop-specific base temperature from the average of the day's max and min temperatures. Use accumulated GDD to predict crop development stages. | Estimate monthly potential evapotranspiration (PET) from average temperature, daylight hours, and days in the month using a simplified Thornthwaite-style formula. Returns millimetres of water lost per month. |