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Storage Capacity Calculator
Estimate logical data size, storage consumed by multiple copies and provisioned capacity after a reserve using file or record count and average item size.
Estimate storage from measurable data volume rather than choosing a disk size by guesswork. The result covers logical bytes, complete stored copies and a selected reserve; it does not claim that capacity alone provides backup, durability or performance.
Estimate logical data size, replicated storage, and reserved capacity using binary storage units.
Binary-capacity planningReviewed: October 2026
Separate logical data from provisioned storage
Items × average size × copiesThe final reserve is planning headroom. Account separately for indexes, metadata, snapshots, versioning, compression, deduplication and recovery design when they apply.
Reference: Binary unit arithmetic and AWS storage planning guidance
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Storage capacity planning formula
Logical bytes = Item count × Average item bytes; Replicated bytes = Logical bytes × Copies; Provisioned bytes = Replicated bytes × (1 + Reserve % ÷ 100)
The calculator uses binary units: 1 KiB = 1,024 bytes, 1 MiB = 1,024 KiB, 1 GiB = 1,024 MiB and 1 TiB = 1,024 GiB. Copy count models complete copies only. Reserve is an explicit percentage added after copies.
Example Calculation
Input: 100,000 items × 2.5 MiB, 3 copies, 20% reserve
Output: 244.14 GiB logical; 732.42 GiB after copies; 878.91 GiB to provision
Common Uses
- • Object-storage capacity planning
- • Database-record volume estimates
- • Media archive sizing
- • Replication and backup-copy estimates
- • Near-term growth headroom
How the Storage Capacity Calculator Works
1
Count the stored items
Enter the number of files, objects, database records or other equal-sized planning units.
2
Measure a representative average size
Use KiB, MiB, GiB or TiB and sample real data when item sizes vary widely.
3
Represent complete stored copies
Enter one for a single copy or a whole-number multiple only when the design stores complete copies.
4
Add explicit capacity reserve
Choose headroom for measured growth and known overhead, then review exclusions before provisioning.
Questions about this calculator
Enter an item count, representative average size, number of complete stored copies and reserve percentage. Every result follows directly from those four planning assumptions.
GiB is binary: 1 GiB equals 1,024 cubed bytes. GB is decimal: 1 GB equals 1,000 cubed bytes. This calculator uses binary KiB, MiB, GiB and TiB consistently.
Yes when the system stores complete copies. More complex erasure coding or incremental backup designs may not equal a whole-number copy factor, so use measured effective overhead instead of guessing.
Not automatically. Include them in a measured average item size or reserve when known. Index size, metadata, temporary space, version history and deleted-object retention vary by system.
Use a percentage supported by expected growth, procurement lead time and operational needs. The default is only a starting input, not a universal recommendation; replace it with your measured forecast.
No. Capacity, durability, availability, backup retention and restore testing are separate concerns. Multiple copies can still be lost through deletion, corruption or shared failure domains without an appropriate recovery design.
What this storage estimate includes
The calculator multiplies the number of files or records by their average size to find logical data volume. It then multiplies by the number of stored copies and adds the selected reserve. This produces a transparent planning figure without assuming a particular cloud provider, filesystem or database engine.
Binary storage units used
Inputs use KiB, MiB, GiB and TiB, where each step equals 1,024 of the previous unit. That avoids mixing binary capacity with decimal vendor units such as KB, MB, GB and TB, where each step equals 1,000. Confirm which convention appears on a storage product or invoice before comparing its advertised capacity.
Worked storage example
For 100,000 objects averaging 2.5 MiB, logical data is 250,000 MiB, or about 244.14 GiB. With three stored copies, the replicated amount is about 732.42 GiB. Adding a 20% reserve gives a provisioned target of about 878.91 GiB.
What stored copies means
A value of one represents one stored instance of every item. Use two for two complete copies or three for three complete copies. Replication, erasure coding, snapshots and incremental backups do not always consume a simple whole-number multiple; use an effective copy factor only when it accurately represents the chosen design.
What the reserve should cover
The reserve can represent expected near-term growth and operational headroom. It does not automatically calculate filesystem metadata, database indexes, object versioning, deleted-object retention, temporary files, compression or deduplication. Measure or estimate those separately and include them in the average item size, copy factor or reserve.
Capacity is not a durability design
Enough bytes do not guarantee recoverability. AWS storage guidance treats capacity, data protection, replication, availability and recovery requirements as separate design considerations. Define backup and restore objectives before purchasing capacity.
Reference: AWS storage decision guide.
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