RAID Calculator

See exactly how much usable storage you get — and how many drives you can lose — for RAID 0, 1, 5, 6, 10 and JBOD.

Assumes all drives are the same size. For mixed sizes, RAID uses the smallest drive as the base unit in most configurations.

Usable capacity
—
—

RAID levels at a glance

Choose based on your balance of speed, capacity and safety.

RAID 0

Striping — all capacity, fastest speed, but zero fault tolerance. One dead drive loses everything.

RAID 5

Striped with parity — survives one drive failure while using just one drive's worth of space.

RAID 10

Mirrored stripes — fast and safe, surviving one drive in each mirror pair. Half capacity.

Fault tolerance explained

How many drives can fail without losing data?

More tech tools

Plan your PC build's power draw and display specs too.

PSU Calculator

Related Tools

💻 Screen Size Calculator Calculate the physical dimensions of any screen from its diagonal size and aspect ratio — width, height, area and viewing distance recommendations. 🎨 DPI Converter Convert between pixels, DPI/PPI, and physical print size. Find print dimensions, resolution, and megapixels for any image. ⌨ Keycode Viewer Press any key to see its event.key, event.code and event.keyCode — essential for keyboard event handling and game development. 🔢 Semver Calculator Compare, validate and bump semantic version numbers (MAJOR.MINOR.PATCH) with pre-release and build metadata support. 💻 Dockerfile Generator Generate a production-ready Dockerfile in seconds — pick a base image (Node, Python, Nginx, Go, Java, Rust), set ports, env vars and healthcheck. 🏁 Git Cheat Sheet Searchable reference of 120+ Git commands organized by workflow — setup, staging, branching, merging, stashing and history rewriting.