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Mbps vs MB/s: what’s the difference?

The single most common download-speed mistake is confusing megabits with megabytes. This guide fixes that.

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The short answer

Mbps means megabits per second. MB/s means megabytes per second.

1 byte = 8 bits, so 100 Mbps is about 12.5 MB/s before overhead.

Internet providers usually advertise Mbps. Operating systems, browsers, and download managers often show MB/s.

Quick conversion examples

Internet speedApprox. MB/s
25 Mbps3.13 MB/s
100 Mbps12.50 MB/s
300 Mbps37.50 MB/s
1 Gbps125.00 MB/s

Why this matters for download time

If a game is 100 GB and your connection is 100 Mbps, you must convert units correctly or your estimate will be wrong.

Easy rule to remember

  • Divide Mbps by 8 to get rough MB/s.
  • Allow additional loss for overhead, Wi‑Fi, and server limits.
  • Use the calculator when file size is large enough that small mistakes matter.
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