I'd like to build a foundation for a shed and wanted to know how thick the base needs to be to support a shed with a snowblower and lawn mower.
I wouldn't go less than 4". It all depends on your ground conditions and the MPA of the concrete. If it was me I would form using 2x6 to give me 5 1/2" thick concrete with 10mm rebar.
The foundation should be 5 inches thick.
I Agree with "Mighty Decks Inc" response. If the conditions are right, and the proper preparation is in place then you could get away with 3", I would certainly add re-bar or at least steel wire mesh. But really 4" minimum.
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