Data Storage Converter

Decimal vs binary storage

Decimal storage units use powers of 1000. Binary storage units use powers of 1024. That is why 1 TB and 1 TiB are not the same amount of storage.

Practical intro

Use this data storage converter when a storage size appears in one unit but a system, invoice, operating system, or cloud tool reports it in another. It is especially useful when comparing decimal units such as GB and TB with binary units such as GiB and TiB.

When to use this calculator

• Comparing drive labels with operating-system reported capacity.
• Converting cloud storage, backup, and media sizes between decimal and binary units.
• Checking whether a data set fits on a drive, NAS, bucket, or transfer tool.
• Explaining why a 4 TB disk may appear smaller in TiB-based tools.

Input explanation

• From unit is the unit used by the source value.
• To unit is the unit you want to display.
• Value to convert should be a non-negative storage amount.
• Decimal units use powers of 1000, such as 1 GB = 1,000,000,000 bytes.
• Binary units use powers of 1024, such as 1 GiB = 1,073,741,824 bytes.

Formula, conversion rule, or estimation method

Step-by-step worked example

A 1 TB drive is 1,000,000,000,000 bytes. Dividing by 1,073,741,824 gives about 931 GiB. The drive did not lose space; the label and the operating system are using different unit systems.

Common mistakes

• Treating GB and GiB as the same unit.
• Comparing provider bills, OS tools, and backup reports without checking unit systems.
• Forgetting filesystem formatting, snapshots, parity, and metadata overhead.
• Using storage unit conversion as a performance or throughput conversion.
• Rounding too aggressively for capacity planning.

Planning notes and limitations

• Storage vendors commonly advertise decimal units, while many operating systems and tools show binary units.
• Usable storage can be lower after formatting, RAID parity, snapshots, deduplication metadata, and reserved system space.
• Capacity planning should include growth and retention, not only today's converted size.
• This converter does unit math only; it does not validate backup design, compliance, or storage architecture.

IT validation checklist

Before acting on the estimate, record the unit system used, the measured baseline, the assumed overhead, the growth period, the owner of the system, and the consequence of running short. For network, storage, cloud, and media workflows, also check monitoring data, provider quotas, retention rules, security controls, backup or restore needs, and whether a maintenance window or rollback plan is required. This keeps the calculator result tied to the real environment instead of a single optimistic number.

Before using the result

Use the result as a planning estimate, then compare it with real measurements, vendor documentation, provider limits, monitoring data, and the operational risk of being wrong. For production IT work, leave margin for overhead, growth, retries, security review, maintenance windows, and rollback.