Disk usage calculators for btrfs RAID

Published: April 27th 2026 (week 18 of 2026)

So you want to create or expand your btrfs RAID filesystem, but have no idea how much space you will have (or want to check your math)? Here's a couple of links to help you.

https://www.carfax.org.uk/btrfs-usage/
https://btrfs.nickhuber.ca/ (defers to carfax.org.uk)

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