Mbps vs MB/s
Convert between megabits per second (Mbps) and megabytes per second (MB/s). Understand speed test results and download times.
ISPs advertise speeds in megabits per second (Mbps). File sizes and download managers often show megabytes per second (MB/s). There are 8 bits in a byte, so 100 Mbps equals roughly 12.5 MB/s.
A speed test showing 400 Mbps means you can download about 50 MB per second under ideal conditions—actual file downloads are often slower due to server limits.
Use the bandwidth calculator below to estimate download time from your real-world speed, or run a speed test first to get your Mbps.
Estimated Download Time
8.4s
104.86 MB at 100 Mbps
Related guides
Frequently Asked Questions
Why is my download slower than Mbps divided by 8?▾
Protocol overhead, disk speed, Wi-Fi, and remote server limits reduce real transfer rates below the theoretical maximum.
Is 1 Gbps the same as 125 MB/s?▾
Theoretically yes (1000 ÷ 8). In practice, expect somewhat less on real downloads and speed tests.