Free Mbps to MB/s converter. Convert internet speeds between megabits and megabytes per second and see actual vs advertised download speeds.
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Confused why your 100 Mbps internet downloads files at only 12.5 MB/s? This converter explains the difference and instantly converts between megabits per second (Mbps) and megabytes per second (MB/s). Essential for understanding real download speeds.
Internet Service Providers (ISPs) advertise speeds in Mbps (megabits per second), but your computer shows download speeds in MB/s (megabytes per second). Since 1 byte = 8 bits, you divide Mbps by 8 to get MB/s. That's why 100 Mbps equals only 12.5 MB/s.
Conversion Formula
If you pay for 500 Mbps, speed tests in MB/s should show ~62.5 MB/s.
A 100 GB game on 100 Mbps takes about 2.2 hours (100,000 MB ÷ 12.5 MB/s).
4K streaming needs 25 Mbps (3.125 MB/s), 1080p needs 5 Mbps (0.625 MB/s).
Calculate upload times using your upload speed in Mbps converted to MB/s.
Convert ISP-advertised speeds to actual file download rates you'll see.
Calculate how long files will actually take to download on your connection.
SSDs and HDDs measure in MB/s while networks use Mbps—now you can compare.
Choose the right internet plan by understanding real-world performance.
Using megabits makes speeds appear 8x larger. 100 Mbps sounds faster than 12.5 MB/s, even though they're the same speed. It's a marketing convention that stuck from early telecommunications.
Mb (megabit) uses a lowercase 'b' for bits. MB (megabyte) uses uppercase 'B' for bytes. 1 MB = 8 Mb. Network speeds use bits, file sizes use bytes.
Network overhead, server limits, Wi-Fi interference, and ISP throttling reduce real-world speeds to about 70-80% of theoretical maximum. The conversion shows the theoretical best-case scenario.
These are binary units where 1 MiB = 1,048,576 bytes (2^20) vs 1 MB = 1,000,000 bytes (10^6). Networks typically use decimal (SI) units, while RAM often uses binary (IEC) units.
1 Gbps = 1000 Mbps = 125 MB/s. Divide Gbps by 8 and multiply by 1000, or simply multiply Gbps by 125 to get MB/s.