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Bandwidth Calculator

Work out how long a transfer takes, or how much bandwidth it needs.

Transfer time

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In bits per second

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In bytes per second

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Effective throughput

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Common transfer times at this connection speed

SizeTime

There are 8 bits in a byte, and a megabyte is 1,048,576 bytes. A 100 Mbps line moves about 12.5 MB a second in theory, and rather less in practice, so a real world allowance of roughly 90% of rated speed is the rule of thumb.

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What Is Bandwidth Calculator?

The Bandwidth Calculator works out how long a file takes to transfer at a given speed, or how much bandwidth is needed to move a file within a target time. It handles the bits-versus-bytes difference that trips most estimates.

Who Uses the Bandwidth Calculator?

IT staff and developers use it to answer how long a deploy, backup, or download will take, and to check whether a connection is up to the job.

How to Use the Bandwidth Calculator

  1. Enter the file size and connection speed with the right units.
  2. Choose whether to solve for time or for bandwidth.
  3. Read the result and the comparison table for common sizes.

Why Choose Our Bandwidth Calculator?

  • Bits and bytes handled correctly
  • Shows a realistic 90% of rated throughput
  • Compares common file sizes at once

Try the Bandwidth Calculator above — it is free, fast, and works on any device. Bookmark this page to return whenever you need it.