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Thanks for the reply. I understand what MSL actually is, but I guess my question is, how do i know what 4500 MSL is on a sectional chart? If our flight is regulated to 400 ft agl, and the class C airspace starts at 4500 ft msl, how would i know what 4500 ft msl is in actual AGL feet? Thanks again.

This may seem like a dumb question, but what is the formula for converting MSL to AGL? I appreciate all the help.