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Storage Planning Calculator

RAID Usable Capacity · Dedup/Compression · Growth Projection

When to use: Size SAN, NAS, or server-attached storage arrays. Input raw capacity and RAID level to find usable space after parity overhead. Applies deduplication and compression ratios to estimate effective capacity, then projects raw storage needed to accommodate multi-year growth.

Storage Parameters

Raw Storage Capacity

Drive Size

TB/disk

RAID Level

Deduplication Ratio

Compression Ratio

Annual Growth Rate

Planning Horizon

years

Effective Capacity

13.00 TB

after RAID + dedup + compression

Raw Usable (after RAID)

67% efficiency

6.67 TB

Effective Capacity

with dedup & compression

13.00 TB

Raw Needed for Growth

at 3 yr 20%/yr

17.28 TB

Estimated Disk Count

4 TB each

3 drives