Byte & Data Unit Converter
Convert between bytes and PB in decimal (KB, MB, GB, TB) and binary (KiB, MiB, GiB, TiB) units, with bit counts and transfer times at common speeds.
Byte & Data Unit Converter
Equals 1,500,000,000 bytes
Transfer time estimator
Quick reference: common file sizes
What this tool does
Convert a value across byte units in both SI (decimal, 1000-based: KB, MB, GB) and IEC binary (1024-based: KiB, MiB, GiB) standards at once, plus bits for networking and transfer-time estimates for common link speeds. Everything runs in your browser. The distinction that trips people up: 1 KB is 1000 bytes but 1 KiB is 1024, and the gap compounds — a 1 TB disk is only about 0.91 TiB.
Updated . Provided as is. Check the output before you rely on it in production.
How to use Byte & Data Unit Converter
- 1
Enter value and select unit
Type a number in the 'Value' field and choose source unit from dropdown (B, KB, MB, GB, KiB, MiB, GiB, etc.). Supports both SI (1000) and binary (1024) standards.
- 2
Choose display mode
Click 'SI' to show decimal units, 'Binary' for IEC units, or 'Both' to see all conversions. Results update instantly as you change values.
- 3
View all unit conversions
See results in all selected units (SI, binary, or both). Includes bits for transfer speeds. Precision settable (2-5 decimal places).
- 4
Calculate transfer times
For bits value, see how long it takes to transfer at common speeds (3G, 4G, WiFi, Ethernet, USB). Useful for network performance planning.
Questions and answers
What's the difference between MB and MiB?
Why is my 1TB drive only showing 931GB?
How do I convert bits to bytes?
What's the transfer time calculator?
Is this tool free?
Use it as an API
Byte & Data Unit Converter is also callable as a free HTTP JSON API at
https://aidevhub.io/api/byte-converter/ — GET with query
parameters or POST with a JSON body, no authentication, CORS enabled, fair use
(abusive traffic is throttled at the edge; there is no per-request quota header). Responses return
{ ok, tool, result, meta }.
curl -s "https://aidevhub.io/api/byte-converter/?value=1048576&unit=B"
Machine-readable contract: /api/tool/byte-converter.json All API endpoints: /agents/ LLM site index: /llms.txt
For AI agents: how to call this tool
Machine-readable contract, endpoints and examples. Humans can ignore this section.
Best Path For Builders
Dedicated API endpoint
Deterministic outputs, machine-safe contracts, and production-ready examples.
Dedicated API
https://aidevhub.io/api/byte-converter/ OpenAPI: https://aidevhub.io/api/openapi.yaml
What is the difference between MB and MiB (1000 vs 1024)?
They count in different bases. An MB (megabyte, SI) is 1,000,000 bytes, while a MiB (mebibyte, IEC binary) is 1,048,576 bytes — the powers of 1024. The two are close for small values and diverge as the numbers grow, which is why a file size, a disk capacity, and a download can all look inconsistent. This converter shows both standards side by side so you can read whichever the source used.
Step by step
- Enter a value and choose its unit from the SI or binary group.
- Pick a display mode: SI (1000), IEC (1024), or Both.
- Read the converted values, plus the bits line for networking math.
- Check the transfer-time estimates across common connection speeds.
Byte unit boundaries this converter uses
| Unit | Standard | Bytes |
|---|---|---|
| KB / KiB | SI / IEC | 1,000 / 1,024 |
| MB / MiB | SI / IEC | 1,000,000 / 1,048,576 |
| GB / GiB | SI / IEC | 1,000,000,000 / 1,073,741,824 |
| TB / TiB | SI / IEC | 1,000,000,000,000 / 1,099,511,627,776 |
Multipliers as this converter uses them. SI/decimal units (KB, MB) count in powers of 1000; IEC/binary units (KiB, MiB) count in powers of 1024. Storage makers advertise in SI, while most operating systems report in binary.
Why does my hard drive show less space than advertised?
Because the label and the operating system use different units. A drive sold as "1 TB" holds 1,000,000,000,000 bytes (SI), but an OS that counts in binary divides by 1,099,511,627,776, so it reports about 0.91 TiB. No space is missing — it is the same byte count shown in a different unit, which this converter makes explicit by displaying both.
How do I estimate a file transfer time?
Transfer speeds are quoted in bits per second, not bytes, so the size is multiplied by 8 and divided by the link rate. The converter shows the value in bits and estimates the time across presets from mobile data up to gigabit and NVMe speeds, which is a quick sanity check before a large upload or copy.
Does the converter send my values anywhere?
No. All conversion and estimation is arithmetic done in the page, with no network calls, so it works offline and nothing you enter is transmitted. It is a self-contained client-side calculator.