This page converts kilobits per second into bytes per second using the factor 125, and shows the reverse figure alongside it. Both units measure how much data moves per second, which is why one number does the whole job.
Kilobits per second is the unit of audio bitrates and the old modem speeds. In networking a kilobit is exactly 1,000 bits, not 1,024. One byte per second is eight bits per second. File transfer tools report bytes, which is the single most common source of confusion about whether a connection is running at its rated speed.
Bits and bytes. Network speeds are sold in bits per second and file transfers are reported in bytes per second, and there are eight bits to a byte, so a 100 Mbps line downloads at about 12 MB/s. A connection is not underperforming by a factor of eight; it is being measured in different units. Below the calculator there is a step table for the values people look up most, and a second table putting real how much data moves per second figures into bytes per second so the number you get has something to be compared against.
The formula
kilobits per second- The amount you are converting, in kilobits per second
125- The exact number of bytes per second in one kilobit per second
bytes per second- The converted result
How it works, step by step
- Enter the value in kilobits per second.
- It is multiplied by 125, the exact factor between the two units.
- The answer is shown in bytes per second, with the reverse conversion beneath it.
- Check the reference table if you want a figure of comparable size.
Worked examples
HD video stream: 8000 kbit/s in bytes per second
HD video stream comes to about 8000 kbit/s. Multiplying by the factor: 8000 × 125 = 1e+06 B/s. Dividing the answer back by 125 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
Wi-Fi 6 link rate: 1.2e+06 kbit/s in bytes per second
Take wi-fi 6 link rate, roughly 1.2e+06 kbit/s. The conversion is a single multiplication — 1.2e+06 × 125 — giving 1.5e+08 B/s. Because the relationship is proportional, doubling the input doubles the answer to 3e+08 B/s.
How to read your score
Frequently asked questions
How many bytes per second are in one kilobit per second?
Exactly 125. Every figure on this page is that one number multiplied by your input, so the only rounding is at the display step.
What is the formula to convert kilobits per second to bytes per second?
bytes per second = kilobits per second × 125. Reversed, kilobits per second = bytes per second ÷ 125, which is the same as multiplying by 0.008.
Which is the bigger unit, the kilobit per second or the byte per second?
The kilobit per second. One kilobit per second equals 125 bytes per second.
What does this quantity actually measure?
Both units measure how much data moves per second. That is why a single factor is enough: there is no temperature offset and no material property involved, unlike conversions that cross between different quantities.
What is a kilobit per second?
Kilobits per second is the unit of audio bitrates and the old modem speeds. In networking a kilobit is exactly 1,000 bits, not 1,024.
What is a byte per second?
One byte per second is eight bits per second. File transfer tools report bytes, which is the single most common source of confusion about whether a connection is running at its rated speed.
Why does my answer differ from another converter?
Almost always because the other tool rounded the factor before multiplying. This page keeps full double precision through the calculation and rounds only for display, and it prints the factor it used so you can see where any difference came from.
Is there a quick way to do kbit/s to B/s in my head?
Plenty of people do this in their head: multiply by 120 instead of using the exact factor 125. At 100 that shortcut gives 12,000 bytes per second, off by 500 bytes per second or about 4.00%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Kilobits Per Second to bytes per second reference tables
| Kilobits Per Second | Bytes Per Second |
|---|---|
| 0.5 kbit/s | 62.5 B/s |
| 1 kbit/s | 125 B/s |
| 2 kbit/s | 250 B/s |
| 3 kbit/s | 375 B/s |
| 5 kbit/s | 625 B/s |
| 10 kbit/s | 1250 B/s |
| 20 kbit/s | 2500 B/s |
| 25 kbit/s | 3125 B/s |
| 50 kbit/s | 6250 B/s |
| 75 kbit/s | 9375 B/s |
| 100 kbit/s | 12,500 B/s |
| 250 kbit/s | 31,250 B/s |
| 500 kbit/s | 62,500 B/s |
| 1000 kbit/s | 125,000 B/s |
| 5000 kbit/s | 625,000 B/s |
Exact factor: 1 kilobit per second = 125 bytes per second.
| Quantity | kbit/s | B/s |
|---|---|---|
| MP3 audio, 320 kbps | 320 kbit/s | 4e+04 B/s |
| SD video stream | 3000 kbit/s | 3.75e+05 B/s |
| HD video stream | 8000 kbit/s | 1e+06 B/s |
| 4K video stream | 2.5e+04 kbit/s | 3.125e+06 B/s |
| Wired gigabit Ethernet | 1e+06 kbit/s | 1.25e+08 B/s |
| Wi-Fi 6 link rate | 1.2e+06 kbit/s | 1.5e+08 B/s |
Published reference values, converted with the same factor this page uses.