How bytes to bits conversion works
Each byte contains 8 bits, so to convert bytes to bits you multiply by 8. For 10 bytes: 10 × 8 = 80 bits. This is useful when comparing file sizes (in bytes) against transfer speeds (in bits per second).
A worked example makes it concrete. A 25 MB file is 25,000,000 bytes, or 200,000,000 bits. On a 50 Mbps connection that is 200 ÷ 50 = 4 seconds at best, before protocol overhead and server limits are counted. The same file on a 10 Mbps line takes about 20 seconds.
If you are checking your work, the megabytes to gigabytes calculator gives you a second reference point.
How to use this calculator
Enter the number of bytes and read the result in bits. The value is always eight times the byte count. To convert the other way, use the bits to bytes calculator.
The maths runs in your browser, so no value you type is sent anywhere. Decimals are accepted, which helps with per-record estimates: 2.5 bytes per field across a million rows is 20 million bits, or 2.5 MB of raw payload.
Bytes to bits reference table
Common conversions:
| Bytes | Bits |
|---|---|
| 1 byte | 8 bits |
| 2 bytes | 16 bits |
| 10 bytes | 80 bits |
| 100 bytes | 800 bits |
| 1024 bytes | 8192 bits |
For larger units, see the gigabytes to megabytes calculator.
Note the two conventions in that last row. Storage and memory use 1024 bytes per kilobyte, so 1 KiB is 8192 bits, while network and drive-marketing figures use 1000, giving 8000 bits. Mixing them is the usual reason a transfer estimate lands about 2.4% off.
Frequently asked questions
- How many bits is 10 bytes?
- 80 bits. There are 8 bits in a byte, so 10 × 8 = 80.
- How do I convert bytes to bits?
- Multiply the number of bytes by 8, since each byte holds 8 bits.
- Why convert bytes to bits?
- To compare a file size (bytes) with a connection speed (bits per second) and estimate how long a transfer takes.
- Is a kilobyte 8000 or 8192 bits?
- It depends on the convention: 1024 bytes × 8 = 8192 bits (binary), or 1000 bytes × 8 = 8000 bits (decimal).
- Does this account for network overhead?
- No, it converts raw bytes only. Real transfers add TCP/IP headers and framing worth roughly 5-10%, so a download takes slightly longer than the raw bit count divided by your line speed suggests.