Cloud Base Calculator

Estimate the height of cumulus cloud bases.

Cloud base height 1,250

Cloud base height 4,101.05

Formula: height ≈ 125·(T − T_dew) metres

Step-by-step with your numbers:

1. Values used:

2. Surface temperature = 25 °C

3. Dew point = 15 °C

5. Cloud base height = 1,250

6. Cloud base height = 4,101.05

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The temperature–dew point spread predicts how high cumulus clouds form.

The math behind it

Cloud base ≈ 125 m per °C of spread (about 400 ft per °C / 1000 ft per 2.5 °C).

25 °C with 15 °C dew point → about 1250 m (4100 ft).

Why does a small spread mean low clouds?

The air needs less lifting to cool to saturation.