Kilobytes to Bits
An instant kilobytes-to-bits converter, with the formula and a reference table below.
| Kilobytes | Bits |
|---|---|
| 1 KB | 8000 bit |
| 2 KB | 16000 bit |
| 3 KB | 24000 bit |
| 5 KB | 40000 bit |
| 10 KB | 80000 bit |
| 25 KB | 200000 bit |
| 50 KB | 400000 bit |
| 100 KB | 800000 bit |
How to use
- Enter a value in the Kilobytes field.
- The Bits figure appears immediately — no button to press.
- Typing in the Bits field converts back to Kilobytes the same way.
- Use the reference table for the values that come up most often.
Kilobytes to Bits formula
The factor from kilobytes to bits is 8000.
bit = KB × 8000
Put another way, one kilobyte is exactly 8,000 bits.
Why this factor: the kilobyte and the bit are both defined against the byte, so dividing one definition by the other gives 8000 directly. Both definitions are set out in full below.
To go the other way, divide by 8000 — or use the Bits to Kilobytes converter, which is the same calculation reversed.
Worked example
Take 4 KB and multiply by the factor 8000: the result is 32000 bit.
4 KB × 8000 = 32000 bit
The converter above does this for any value you type, in either direction.
What is a kilobyte?
A kilobyte is 1,000 bytes in the decimal convention used by storage manufacturers and standards bodies.
Definition: Exactly 1,000 bytes under SI prefixes. The binary equivalent, 1,024 bytes, is properly the kibibyte (KiB).
Where it is used: Small file sizes, text documents, and web page weights.
Worth knowing: This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
What is a bit?
A bit is the smallest unit of digital information — a single binary digit, either 0 or 1.
Definition: One eighth of a byte. The name is a contraction of 'binary digit'.
Where it is used: Network and connection speeds, which are always quoted in bits per second.
Worth knowing: Lowercase 'b' is bits, uppercase 'B' is bytes. A 100 Mb/s connection delivers about 12.5 MB/s.
Kilobytes vs Bits
The kilobyte and the bit belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many bits are in a kilobyte?
One kilobyte equals 8000 bits.
What is the formula to convert kilobytes to bits?
Multiply the number of kilobytes by 8000. To reverse it, divide by 8000 instead.
How do I convert bits back to kilobytes?
Divide by 8000, which is the same as multiplying by 0.000125.
How many bits are in 10 kilobytes?
10 KB works out to 80000 bit.
Is there anything to watch out for with kilobytes?
This decimal-versus-binary split is why a '1 TB' drive shows as about 931 GB in Windows: the drive uses 10¹², the OS displays 2⁴⁰.
How is the kilobyte defined?
Exactly 1,000 bytes under SI prefixes. The binary equivalent, 1,024 bytes, is properly the kibibyte (KiB).