Convert data rates between bits and bytes per second, from kbps and Mbps to KB/s, MB/s and Gbps.
Calculations happen locally. We do not send your values to our server.
One byte is 8 bits, so a 100 Mbps connection can deliver at most about 12.5 MB/s, a 300 Mbps plan about 37.5 MB/s and gigabit about 125 MB/s. A download showing 25 MB/s is using about 200 Mbps.
Everything converts through bits per second, and byte rates are multiplied by 8 to reach bit rates. The prefixes here are decimal, so 1 Mbps is 1,000,000 bits per second and 1 MB/s is 1,000,000 bytes per second.
Advertised link speed and real transfer speed differ because of protocol overhead, Wi-Fi signal quality, busy servers, other devices sharing the connection and the speed of the storage being written to. Wi-Fi routers often show a link rate, the maximum negotiated speed, rather than the throughput you will see.
Internet plans and network equipment advertise speeds in bits per second, written with a small b: kbps, Mbps or Gbps. Download managers and file copies usually show bytes per second, written with a capital B: KB/s or MB/s. One byte is 8 bits, so divide by 8 to go from Mbps to MB/s. A 100 Mbps connection can deliver at most about 12.5 MB/s, a 300 Mbps plan about 37.5 MB/s and gigabit about 125 MB/s. A download showing 25 MB/s is using about 200 Mbps.
Divide the file size by the transfer rate in the same units. A 5 GB file is 40,000 megabits, so at a steady 100 Mbps it takes about 400 seconds, or 6 minutes 40 seconds. A 50 GiB game at 300 Mbps takes roughly 24 minutes. Real transfers are usually slower than the plan speed because of protocol overhead, Wi-Fi signal quality, busy servers, other devices sharing the connection and the speed of the storage being written to.
This converter uses decimal prefixes: 1 Mbps is 1,000,000 bits per second and 1 MB/s is 1,000,000 bytes per second. Some programs display binary units, MiB/s, which are about 4.9% larger than MB/s, so their numbers look slightly lower. Older dial-up modems were rated at 56 kbps, which is only 7 KB/s. Wi-Fi routers often show a link rate, the maximum negotiated speed, which is higher than the actual throughput you will see when downloading files.
| Input | Result |
|---|---|
100 Mbps → MB/s | 12.5 |
300 Mbps → MB/s | 37.5 |
1 Gbps → MB/s | 125 |
25 MB/s → Mbps | 200 |
56 kbps → KB/s | 7 |
1 GB/s → Gbps | 8 |
The small b means bits and the capital B means bytes. Internet plans and network hardware advertise bits per second, while download managers and file copies usually show bytes per second. Since a byte is 8 bits, divide by 8 to go from Mbps to MB/s: 56 kbps, the old dial-up rate, is only 7 KB/s.
Divide the file size by the rate in matching units. A 5 GB file is 40,000 megabits, so at a steady 100 Mbps it takes about 400 seconds, that is 6 minutes 40 seconds, and a 50 GiB game at 300 Mbps takes roughly 24 minutes. Real transfers usually run slower than the plan speed.
Because they use binary units. MiB/s is about 4.9% larger than MB/s, so the same transfer reads as a slightly lower number. This converter uses decimal prefixes throughout, which is the convention for network data rates.
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