Data size & transfer time calculator

Convert bytes, KB, MB, GB and TB (decimal and binary) and calculate how long a transfer takes at a given speed.

Runs in your browser · nothing is sentPorts, protocols & bandwidth

ValueUnit

Decimal (SI)

Connection speed (Mbit/s)

1m 20s

Enter a size and unit to see it in SI (1000) and IEC (1024) units. Add a connection speed in Mbit/s to estimate the transfer time.

🔒 Your input stays in your browser and is never sent anywhere.

What is the difference between GB and GiB?

A GB is 1,000,000,000 bytes, a GiB is 1,073,741,824 bytes. Operating systems often mix the two.

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