How much video can you record on a 64 GB iPhone 12?

Solution 1:

The Camera settings on iPhone 12 shows

• 4K @ 60fps is 440MB per minute.
• 4K @ 30fps is 190MB per minute.

I don’t have an iPhone 12 to know exactly how much space is reserved by iOS but supposing it’s 15 GB that leaves 110 minutes of 4k60 or 257 minutes of 4k30.

Solution 2:

In addition to the other answers, in iOS's camera settings there's a little summary of the amount of data each minute of video at different resolutions/FPS. You can see this summary of how much space it takes per each minute of video in Settings>Camera>Record Video

This is what is says for my iPhone XS, so it would be different on an iPhone 12 with the latest hardware.