To convert terabits per second to kilobytes per second, multiply by 125,000,000. That factor is the whole relationship: both units measure how much data moves per second, so the conversion is a proportion with no offset and no substance-specific constant.
Kilobytes per second is what a download dialog shows on a slow connection: 1 kB/s is 8 kbit/s. Terabits per second describes backbone and submarine cable capacity rather than anything you can buy for a house.
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. Two tables follow: rounded steps for quick lookup, and a set of real reference quantities converted into kilobytes per second, which is usually more useful than the bare number.
The formula
terabits per second- The amount you are converting, in terabits per second
125,000,000- The exact number of kilobytes per second in one terabit per second
kilobytes per second- The converted result
How it works, step by step
- Enter the value in terabits per second.
- It is multiplied by 125,000,000, 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
Wired gigabit Ethernet: 0.001 Tbit/s in kilobytes per second
At 0.001 Tbit/s (wired gigabit ethernet), the same quantity in kilobytes per second is 0.001 × 1.25e+08 = 125,000 kB/s. One terabit per second is 1.25e+08 kilobytes per second, so the numbers grow as expected.
Wi-Fi 6 link rate: 0.0012 Tbit/s in kilobytes per second
Wi-Fi 6 link rate comes to about 0.0012 Tbit/s. Multiplying by the factor: 0.0012 × 1.25e+08 = 150,000 kB/s. Dividing the answer back by 1.25e+08 returns the figure you started with, which is the quickest way to check you have the factor the right way up.
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Frequently asked questions
How many kilobytes per second are in one terabit per second?
Exactly 125,000,000. 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 terabits per second to kilobytes per second?
kilobytes per second = terabits per second × 125,000,000. Reversed, terabits per second = kilobytes per second ÷ 125,000,000, which is the same as multiplying by 8e-09.
Which is the bigger unit, the terabit per second or the kilobyte per second?
The terabit per second. One terabit per second equals 1.25e+08 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 terabit per second?
Terabits per second describes backbone and submarine cable capacity rather than anything you can buy for a house.
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 Tbit/s to kB/s in my head?
Plenty of people do this in their head: multiply by 120000000.000000 instead of using the exact factor 125,000,000. At 100 that shortcut gives 12000000000.000000 kilobytes per second, off by 500000000.000000 kilobytes per second or about 4.00%. Fine for a rough estimate, not fine for anything you are cutting to size or dosing.
Terabits Per Second to kilobytes per second reference tables
| Terabits Per Second | Kilobytes Per Second |
|---|---|
| 0.5 Tbit/s | 6.25e+07 kB/s |
| 1 Tbit/s | 1.25e+08 kB/s |
| 2 Tbit/s | 2.5e+08 kB/s |
| 3 Tbit/s | 3.75e+08 kB/s |
| 5 Tbit/s | 6.25e+08 kB/s |
| 10 Tbit/s | 1.25e+09 kB/s |
| 20 Tbit/s | 2.5e+09 kB/s |
| 25 Tbit/s | 3.125e+09 kB/s |
| 50 Tbit/s | 6.25e+09 kB/s |
| 75 Tbit/s | 9.375e+09 kB/s |
| 100 Tbit/s | 1.25e+10 kB/s |
| 250 Tbit/s | 3.125e+10 kB/s |
| 500 Tbit/s | 6.25e+10 kB/s |
| 1000 Tbit/s | 1.25e+11 kB/s |
| 5000 Tbit/s | 6.25e+11 kB/s |
Exact factor: 1 terabit per second = 125,000,000 kilobytes per second.
| Quantity | Tbit/s | kB/s |
|---|---|---|
| MP3 audio, 320 kbps | 3.2e-07 Tbit/s | 40 kB/s |
| SD video stream | 3e-06 Tbit/s | 375 kB/s |
| HD video stream | 8e-06 Tbit/s | 1000 kB/s |
| 4K video stream | 2.5e-05 Tbit/s | 3125 kB/s |
| Wired gigabit Ethernet | 0.001 Tbit/s | 1.25e+05 kB/s |
| Wi-Fi 6 link rate | 0.0012 Tbit/s | 1.5e+05 kB/s |
Published reference values, converted with the same factor this page uses.