Growing Degree Day Simple

How to use this calculator

1. Enter daily maximum in °C.
2. Enter daily minimum in °C.
3. Enter base temperature in °C.
4. Select Calculate and keep the output unit with the answer.

Before you use the answer

Use measurements from the actual bed, container or watering zone and keep them with a dated garden record. Defaults illustrate arithmetic rather than plant-specific requirements. Soil condition, weather, crop variety and growth stage can change what amount or spacing is appropriate.

This method has no upper cutoff. Crop-specific models may use different thresholds and calculation methods.

Does it save my inputs?

No calculation history is stored by this website. The calculator works locally in your browser. See the privacy policy for hosting and contact details.

Why might a result be approximate?

Measurement uncertainty, ideal-model assumptions and floating-point rounding can all matter. Displaying more digits does not improve the original measurement.