Cloud Base Calculator

Approximation based on the surface temperature/dewpoint spread converging by about 4.4°F per 1000 ft in rising unsaturated air. Estimates a convective cloud base, not an observed ceiling, multilayer clouds or an operational flight decision.

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Result

Enter your values and run the tool to see your result.

How to use this tool

Check the units, enter your values, and run the tool. Results follow the assumptions and method below.

Calculation method

Approximate convective cloud-base height1000*(temperature-dewpoint)*1.8/4.4

Approximate cloud-base height in meters304.8*(temperature-dewpoint)*1.8/4.4

References

https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_135-45_FAA_Web.pdf