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Data size and transfer time calculator

Enter a size to see it in every unit, and a line speed for the transfer time. Calculated in your browser.

Runs locally — nothing is uploaded
Result
Nothing yet — enter data or press Example.

How to use

  1. 1Enter a size and choose its unit.
  2. 2Optionally enter a connection speed.
  3. 3Read the size in every unit and the transfer times.

GB is decimal: 1 GB = 1,000,000,000 bytes. GiB is binary: 1 GiB = 1,073,741,824 bytes. Drive makers use GB and many operating systems show GiB, which is why a 1 TB disk shows about 931 GiB.

Line speeds are given in bits and a byte has 8 bits, so 100 Mbit/s is at most 12.5 MB/s.

It is the theoretical time at the full line rate. Protocol overhead, latency and congestion usually make real transfers 5–15% slower, often more.

Messy data?

Send a sample — we reply within one business day with an approach and a quote.