Data Storage Converter
Convert bits, bytes, KB, MB, GB, TB and the IEC KiB, MiB, GiB, TiB.
Quick answer
- Formula: Result = Value × (factor of from-unit in bytes) ÷ (factor of to-unit in bytes); SI = ×1000, IEC = ×1024
- Worked example — Converted size: 1,073.741824 (full example below).
Data Storage Converter
| Converted size | 1,073.741824 |
| Summary | 1 GiB = 1073.741824 MB |
1 GiB is 1073.74 MB — not 1024 MB — because a GiB is 1024³ bytes while an MB is 1000² bytes.
Convert digital storage between bits, bytes and the two competing 'kilo' systems. SI units (KB, MB, GB, TB) are powers of 1000, as used by hard-drive manufacturers and macOS. IEC units (KiB, MiB, GiB, TiB) are powers of 1024, as used by Windows and most software.
That is why a '500 GB' drive shows as about 465 GiB in Windows: 500 × 1000³ ÷ 1024³ ≈ 465.66. One byte is 8 bits.
The formula
Worked example
1 GiB is 1073.74 MB — not 1024 MB — because a GiB is 1024³ bytes while an MB is 1000² bytes.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
Is a kilobyte 1000 or 1024 bytes?
Both, depending on the system: the SI kilobyte is exactly 1000 bytes, and the IEC kibibyte (KiB) is exactly 1024 bytes. Drive makers use 1000; Windows reports 1024-based values but labels them KB/MB/GB.
Why does my 1 TB drive show only 931 GB?
It is showing gibibytes: 1 TB = 1000⁴ bytes ÷ 1024³ ≈ 931.3 GiB. No space is missing — the units differ.
How many bits are in a byte?
Exactly 8 bits. Network speeds are quoted in bits per second (Mbps), file sizes in bytes, so a 100 Mbps connection downloads at most about 12.5 MB per second.
Category: Unit Conversions calculators
Sources & methodology
This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.
Content last reviewed by CalcHub Editorial.
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