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