how much space do I need for Big Sur?

How to upgrade to macOS Big Sur - Apple Support

"If upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of available storage to

upgrade. If upgrading from an earlier release, macOS Big Sur requires

up to 44.5GB of available storage. To upgrade from OS X Mountain Lion,

first upgrade to OS X El Capitan, then upgrade to macOS Big Sur."

gwtpg Said:

"how much space do I need for Big Sur? How can I install Big Sur - when I try it says I don't have enough space"

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Obtain More Storage:

Consider removing unnecessary files (i.e iTunes Movies and TV Shows). Also, upgrade your amount of iCloud storage (which is charged monthly) for remote accessing. Once that is obtained, you may be set from there. Go Here: iCloud Storage Plans and Pricing - Apple Support