Compare capacities, parity overhead, write penalties, and fault tolerance limits across ZFS, BTRFS, and LVM Thin in your homelab. Everything runs locally.
Note: ZFS reserves ~1/64 (~1.5%) of capacity for metadata overhead, and filesystems typically want at least 10-20% free space to maintain high write performance. This calculator shows the formatted capacity before those filesystem limits. These are rough planning estimates, not a guarantee — real usable capacity depends on your exact drives, ashift, block size, and filesystem version. Verify against your own setup before you build a pool or trust it with data. Provided as-is, no warranty.