This page converts megabits per second into kilobytes 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.
Megabits per second is how every broadband package is advertised. The figure is bits, so divide by eight to get the download speed your browser will show. Kilobytes per second is what a download dialog shows on a slow connection: 1 kB/s is 8 kbit/s.
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. The tables underneath give both a plain step-by-step lookup and a list of real quantities expressed in kilobytes per second, so you can sanity-check whether your answer is a plausible size.
The formula
megabits per second- The amount you are converting, in megabits per second
125- The exact number of kilobytes per second in one megabit per second
kilobytes per second- The converted result
How it works, step by step
- Enter the value in megabits per second.
- It is multiplied by 125, the exact factor between the two units.
- The answer is shown in kilobytes 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: 8 Mbit/s in kilobytes per second
Take hd video stream, roughly 8 Mbit/s. The conversion is a single multiplication — 8 × 125 — giving 1000 kB/s. Because the relationship is proportional, doubling the input doubles the answer to 2000 kB/s.
4K video stream: 25 Mbit/s in kilobytes per second
Take 4k video stream, roughly 25 Mbit/s. The conversion is a single multiplication — 25 × 125 — giving 3125 kB/s. Because the relationship is proportional, doubling the input doubles the answer to 6250 kB/s.
How to read your score
Frequently asked questions
How many kilobytes per second are in one megabit 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 megabits per second to kilobytes per second?
kilobytes per second = megabits per second × 125. Reversed, megabits per second = kilobytes per second ÷ 125, which is the same as multiplying by 0.008.
Which is the bigger unit, the megabit per second or the kilobyte per second?
The megabit per second. One megabit per second equals 125 kilobytes 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 megabit per second?
Megabits per second is how every broadband package is advertised. The figure is bits, so divide by eight to get the download speed your browser will show.
What is a kilobyte per second?
Kilobytes per second is what a download dialog shows on a slow connection: 1 kB/s is 8 kbit/s.
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 Mbit/s to kB/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 kilobytes per second, off by 500 kilobytes per second or about 4.00%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Megabits Per Second to kilobytes per second reference tables
| Megabits Per Second | Kilobytes Per Second |
|---|---|
| 0.5 Mbit/s | 62.5 kB/s |
| 1 Mbit/s | 125 kB/s |
| 2 Mbit/s | 250 kB/s |
| 3 Mbit/s | 375 kB/s |
| 5 Mbit/s | 625 kB/s |
| 10 Mbit/s | 1250 kB/s |
| 20 Mbit/s | 2500 kB/s |
| 25 Mbit/s | 3125 kB/s |
| 50 Mbit/s | 6250 kB/s |
| 75 Mbit/s | 9375 kB/s |
| 100 Mbit/s | 12,500 kB/s |
| 250 Mbit/s | 31,250 kB/s |
| 500 Mbit/s | 62,500 kB/s |
| 1000 Mbit/s | 125,000 kB/s |
| 5000 Mbit/s | 625,000 kB/s |
Exact factor: 1 megabit per second = 125 kilobytes per second.
| Quantity | Mbit/s | kB/s |
|---|---|---|
| MP3 audio, 320 kbps | 0.32 Mbit/s | 40 kB/s |
| SD video stream | 3 Mbit/s | 375 kB/s |
| HD video stream | 8 Mbit/s | 1000 kB/s |
| 4K video stream | 25 Mbit/s | 3125 kB/s |
| Wired gigabit Ethernet | 1000 Mbit/s | 1.25e+05 kB/s |
| Wi-Fi 6 link rate | 1200 Mbit/s | 1.5e+05 kB/s |
Published reference values, converted with the same factor this page uses.