Internet Speed Converter: Mbps, MB/s, Kbps and Gbps
Convert Mbps to MB/s, Kbps and Gbps instantly, and work out how much internet speed your household needs for streaming, gaming and video calls.
Convert between Mbps, MB/s, Kbps, Gbps and their binary equivalents, then work out how much speed your household actually needs.
Quick answer
To convert Mbps to MB/s, divide by 8. A 100 Mbps connection is 12.5 MB/s, not 100 MB/s, because there are eight bits in a byte. Going the other way, multiply megabytes per second by 8 to get megabits per second. Everything else on this page follows from that single relationship.
| Unit | Value |
|---|
How much internet speed do you actually need?
Bits, bytes and why 100 Mbps is never 100 MB/s
Network speeds are quoted in bits per second because that is what the equipment actually carries. File sizes are quoted in bytes because that is how computers store data. One byte is eight bits, so 1 Mbps equals 0.125 MB/s and the fastest a 100 Mbps line can ever deliver is 12.5 MB/s. Any tool that shows 100 MB/s on a 100 Mbps line is wrong by a factor of eight.
There is a second, smaller trap. A megabyte is 1,000,000 bytes (decimal) while a mebibyte is 1,048,576 bytes (binary). Your browser and the speed test normally use decimal units, while some operating systems report the binary ones, so the same transfer can look about 4.9 percent different depending on the tool.
How much internet speed does a household actually need
Add up what is happening at the same time, not what happens over a day. The FCC Household Broadband Guide puts light household use at 3 to 8 Mbps, moderate use at 12 to 25 Mbps, and high use at more than 25 Mbps. Video is what pushes a household up those bands: streaming services publish guidance of around 5 Mbps for HD and up to 25 Mbps for Ultra HD, and cloud gaming adds roughly 35 Mbps per session.
Two things matter more than the peak number. First, simultaneous demand: three people watching 4K at once need three times one person. Second, headroom: if your plan exactly matches your calculated peak, one extra device causes buffering. This calculator adds a headroom percentage for that reason, and then names the smallest common package tier that covers the result.
Speed definitions and usage guidance on this page follow the sources below rather than a broadband vendor advertisement. This tool was reviewed and fact-checked on 28 September 2026.
- FCC, Household Broadband Guide — the regulator usage bands used above: basic 3 to 8 Mbps, medium 12 to 25 Mbps, advanced more than 25 Mbps, by number of simultaneous devices. fcc.gov
- Netflix, internet connection speed recommendations — a streaming provider own published requirement, about 5 Mbps for HD and 15 Mbps for Ultra HD per stream. help.netflix.com
- NIST, Metric (SI) Prefixes — the decimal prefixes behind Mbps, Kbps and Gbps. nist.gov
- IEC 80000-13 — the binary prefixes behind KiB/s, MiB/s and GiB/s. webstore.iec.ch
Cite this tool
Afroz Ahmad, “Internet Speed Converter and Bandwidth Calculator”, afrozahmad.com. https://afrozahmad.com/internet-speed-converter/
Suggested citation: Internet Speed Converter and Bandwidth Calculator, https://afrozahmad.com/internet-speed-converter/ (accessed 28 September 2026). (afrozahmad.com), reviewed 28 September 2026.
Related reading and tools
Reviewed and fact-checked on 28 September 2026.
Primary sources
Speed definitions and usage guidance on this page follow the sources below rather than a broadband vendor advertisement. This tool was reviewed and fact-checked on 28 September 2026.
- FCC, Household Broadband Guide — the regulator usage bands used above: basic 3 to 8 Mbps, medium 12 to 25 Mbps, advanced more than 25 Mbps, by number of simultaneous devices. fcc.gov
- Netflix, internet connection speed recommendations — a streaming provider own published requirement, about 5 Mbps for HD and 15 Mbps for Ultra HD per stream. help.netflix.com
- NIST, Metric (SI) Prefixes — the decimal prefixes behind Mbps, Kbps and Gbps. nist.gov
- IEC 80000-13 — the binary prefixes behind KiB/s, MiB/s and GiB/s. webstore.iec.ch
How many MB/s is 100 Mbps?
100 Mbps is 12.5 MB/s. Divide megabits per second by 8 to get megabytes per second, because a byte is eight bits. A 500 Mbps plan therefore delivers at most 62.5 MB/s and a 1 Gbps plan at most 125 MB/s.
Why does a speed test show a different number to my plan?
Speed tests measure the path at that moment, so Wi-Fi quality, the test server, other devices on the network and peak-hour congestion all change the result. Wired tests are usually higher than Wi-Fi, and a device that cannot handle gigabit will cap the reading before the line does.
How much speed do I need for 4K streaming?
Plan about 25 Mbps per 4K stream to cover HDR and the overheads, even though streaming providers publish a lower figure – Netflix, for example, lists 15 Mbps for Ultra HD and about 5 Mbps for HD. If two people watch 4K at once, budget for both streams at the same time.
Is 100 Mbps enough for a family?
Usually yes. The FCC usage guidance treats anything above 25 Mbps as high-demand household use, so 100 Mbps leaves room for several HD streams and video calls at once. It becomes tight only with multiple 4K streams, cloud gaming or very large simultaneous uploads.
Does upload speed matter for video calls?
Yes. A video call needs a steady upload as well as download, typically a few megabits per second each way per call. A plan with 500 Mbps down and 20 Mbps up is fine for a couple of calls; several simultaneous calls, or a large cloud backup, can saturate the upload first.