⚖️ 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 5,000 Mbps (raw signalling rate) ~500 MB/s in practice

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. This comparison is general guidance based on publicly available information. Prices, rates, rules and specifications change, so check current details with the provider or an official source before making a decision. 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.

Frequently asked questions

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'.

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).