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Calcimator

Cloud Base Estimator

Estimate cloud base altitude from temperature and dewpoint spread using Espy's equation. Quick weather assessment for VFR pilots.

Inputs

°C
°C
ft MSL

Results

Estimated Cloud Base (AGL)

4,000 ft

Cloud Base (MSL)

4,500 ft

Fog / Visibility Risk

Low

Temp/Dewpoint Spread10°C
Relative Humidity54%
Estimated Freezing Level13,000 ft MSL

Estimated Cloud Base (AGL)

4,000 ft

Cloud Base (MSL)

4,500 ft

Fog / Visibility Risk

Low

How to Use This Calculator
  1. Get the current temperature and dewpoint from METAR or ATIS.
  2. Enter the field elevation for MSL conversion.
  3. The cloud base estimate tells you the approximate ceiling height.
  4. NOTE: This is an estimate — always check actual METAR ceilings.
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