⚖️ Comparison · Updated for 2026
Mbps vs MB/s
Side-by-side comparison, when-to-use-each guide, and instant conversion. Reviewed for 2026.
Quick answer: Mbps = megabits per second. MB/s = megabytes per second. 1 byte = 8 bits, so 1 MB/s = 8 Mbps. Internet speed is sold in Mbps (bigger marketing number). Download speed shown in a browser is in MB/s. A '100 Mbps' connection downloads at 12.5 MB/s.
Decision guide — when to use which
Use Mbps when…
Internet plan speed, ISP marketing, fibre and broadband ratings.
Use MB/s when…
Browser download speeds, file transfer GUI displays, USB/SSD throughput, hard drive speeds.
📊 Side-by-side comparison
| Aspect | Mbps | MB/s |
|---|---|---|
| Unit | megabits per second | megabytes per second |
| Conversion | ÷ 8 → MB/s | × 8 → Mbps |
| Typical broadband (UK) | 30-1000 Mbps | 3.75-125 MB/s |
| Browser download display | Rare | Standard |
| USB 3.0 maximum | 4,800 Mbps | 600 MB/s |
Frequently asked
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Why are ISP speeds in Mbps?
Historical convention from telecoms (bits per second is the natural unit for line capacity). The bigger marketing number also helps — '1 Gbps fibre' sounds better than '125 MB/s fibre'.
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What speed do I actually get?
For a 100 Mbps connection, ideal download is 12.5 MB/s. In practice, expect 10-11 MB/s due to TCP overhead, Wi-Fi loss, and source-server speed. If you're seeing 1 MB/s, the bottleneck is elsewhere (Wi-Fi, server, or distance).
Reviewed for 2026. All conversion factors and historical references verified against official sources (ISO standards, government weights & measures legislation, IEC technical specifications). Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project. We don't sell SEO links or accept paid placements in this content.