Bandwidth Calculator

Calculate network bandwidth, download time, and transfer rate.

File Size (MB)

Bandwidth (Mbps)

Mbps

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Guides & Reference

How It Works

Data (Mb) = Speed (MB/s) x Time (s) x 8 bits/byte. ISPs advertise in megabits. File sizes in megabytes. 1 MB = 8 Mb.

Formula

Time = Size / Speed

Common calculations — results you can verify instantly.

1 GB at 100 Mb/s

8,000÷100

~80 seconds

4K Netflix

25 Mb/s required

3,125 MB/hr data

1 hour Zoom HD

~1.5 Mb/s

~675 MB used

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Netflix HD: 5 Mb/s. 4K: 25 Mb/s.

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Real speeds are 60-80% of advertised maximum.

Confusing megabits with megabytes

Divide advertised Mb/s by 8 for MB/s file transfer speed.

Using peak speed for planning

Real-world speeds are 60-80% of advertised max.

8000 Mb / 100 = 80 seconds.

25 Mb/s per stream minimum.

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