Ground Temperature Calculator

Estimate undisturbed ground temperature at any depth and time of year.

Mean Annual Air Temp

°F

Seasonal Amplitude

°F

Depth

Day of Year

Soil Thermal Diffusivity

ft²/day

Tab to move between fields

Ground Temperature

52.5 °F

Stable Temp Depth

24.5 ft

Deep Ground Temp55 °F

Damping Factor0.27

Phase Shift76 days

How to Use This Calculator

Enter your geographic latitude.
Set the depth below surface in meters.
Input the mean annual surface temperature for your region.
Review the undisturbed ground temperature at the specified depth.
Ground temperature stabilizes below ~10 m — this stable temperature is the heat source/sink for ground-loop systems.

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Related Calculators

Calculate temperature at depth from the geothermal gradient.

Calculate bore depth and loop length for a geothermal heat pump.

Calculate coefficient of performance from source and delivery temperatures.

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