Data Size Converter
Convert between different data size units including bytes, kilobytes, megabytes, gigabytes, terabytes and more. Supports both binary (1024) and decimal (1000) calculations.
Conversion Settings
KB, MB, GB, TB are decimal (powers of 1000); KiB, MiB, GiB, TiB are binary (powers of 1024).
No value entered
Conversion Result
Conversion result will appear here
Enter a value and click "Convert" to start
About Data Size Converter
A precise data size converter that handles conversions between various digital storage units from bytes to petabytes and beyond. This advanced tool supports both binary (1024-based) and decimal (1000-based) units to match different industry standards and system specifications.
Why use a Data Size Converter?
Critical for system administrators calculating storage requirements, developers optimizing file sizes, and IT professionals planning data infrastructure. Understanding both binary and decimal conversions is essential for accurate capacity planning and avoiding confusion between manufacturer specifications and actual usable storage.
Who is it for?
Essential for IT professionals, system administrators, software developers, and data analysts who work with storage systems and file management. Also valuable for students learning computer science concepts and anyone needing to understand storage capacity specifications across different platforms.
How to use the tool
Enter your data size value in the input field
Select the source unit (bit, B, KB, MB, GB, TB, KiB, MiB, GiB, etc.)
Pick decimal units (KB, MB, GB) or binary units (KiB, MiB, GiB) from the same list
Select your target conversion unit from the dropdown
View the converted result (up to 12 significant digits)
Frequently Asked Questions
How do I convert data size units?
Enter the source value, pick the 'from' and 'to' units, and click Convert to see the result. Supports bit, B (byte), KB / KiB, MB / MiB, GB / GiB, TB / TiB, PB / PiB, EB / EiB, all in one list (KB = 1,000 B, KiB = 1,024 B). Copy the converted value to clipboard. Conversion runs entirely in your browser — values never leave the device. Results are shown to up to 12 significant digits with trailing zeros removed; there is no precision setting.
What data size units does this converter support?
bit, B (byte), KB / KiB, MB / MiB, GB / GiB, TB / TiB, PB / PiB, EB / EiB. The set covers SI base and derived units, common imperial/US-customary units, and domain-specific units where relevant. SI prefixes (k, M, G, m, μ, n) apply where applicable. For any unit not in the list that you need converted, mention it via feedback — the unit set evolves based on user requests.
How accurate is the data size conversion?
Conversions use the internationally-defined factors where they exist; the result is rounded to 12 significant digits for display. The IEC 80000-13 standard (2008) formalized binary prefixes: kibi (Ki, 2¹⁰), mebi (Mi, 2²⁰), gibi (Gi, 2³⁰), tebi (Ti, 2⁴⁰), pebi (Pi, 2⁵⁰). In this tool KB, MB, GB, TB are decimal (powers of 1,000) and KiB, MiB, GiB, TiB are binary (powers of 1,024). Output is rounded to 12 significant digits for display, and there is no setting to change that.
What's the formula to convert gigabytes (GB) to gibibytes (GiB)?
GiB = GB × 0.9313 (decimal-to-binary). Capacity planning — actual usable storage on a '4 TB' drive is ~3.6 TiB. Network transfer time calculations (decimal Mbps vs binary MB/s). Memory specs (RAM always binary; bandwidth often decimal). For other data size-unit pairs, the tool applies the appropriate exact conversion factor automatically — no manual formula needed. Results are rounded to 12 significant digits, which is more than engineering specs typically need.
What's the key accuracy caveat for data size conversion?
**Decimal (KB = 1,000 B) vs binary (KiB = 1,024 B)** — this is why a '1 TB' hard drive shows ~931 GiB in your OS. Storage manufacturers use decimal (powers of 1,000): 1 TB = 1,000,000,000,000 B. Operating systems and RAM specs use binary (powers of 1,024): 1 TiB = 1,099,511,627,776 B. The difference grows with prefix: ~2.4% at KB/KiB, ~10% at TB/TiB. **IEC binary prefixes** (KiB, MiB, GiB, TiB) were standardized in 1998 to disambiguate; the unprefixed forms (KB, MB, GB, TB) historically meant binary but now usually mean decimal.
What's a common real-world use case for data size conversion?
Capacity planning — actual usable storage on a '4 TB' drive is ~3.6 TiB. Network transfer time calculations (decimal Mbps vs binary MB/s). Memory specs (RAM always binary; bandwidth often decimal).
What data size units are commonly confused?
**KB vs KiB, MB vs MiB, GB vs GiB** — decimal vs binary; differ by ~2.4% per prefix step. **Bits vs bytes** — 1 byte = 8 bits; '100 Mbps' (megabits/s) is 12.5 MB/s (megabytes/s). **'GB'** — increasingly means decimal billion bytes; historically often binary.
How do I handle very large or very small data size values?
Use SI prefixes for clean scaling: kilo (10³), mega (10⁶), giga (10⁹), milli (10⁻³), micro (10⁻⁶), nano (10⁻⁹). For very large or very small results, the tool switches to exponent notation (e.g. 1.23e15) at 1e15 and above or below 1e-9. The IEC 80000-13 standard (2008) formalized binary prefixes: kibi (Ki, 2¹⁰), mebi (Mi, 2²⁰), gibi (Gi, 2³⁰), tebi (Ti, 2⁴⁰), pebi (Pi, 2⁵⁰). In this tool KB, MB, GB, TB are decimal (powers of 1,000) and KiB, MiB, GiB, TiB are binary (powers of 1,024). For data interchange, copy the value; it is shown to 12 significant digits.
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