Free online calculator

File Transfer Time Calculator

Estimate upload or download time from file size and connection speed with clear decimal and binary unit handling.

✓ Instant results✓ No sign-up✓ Runs in your browser
How it works

Formula and method

Transfer time in seconds = file size in bits ÷ effective speed in bits per second.

Worked example

A 1 GB file at 100 Mbps takes about 80 seconds before protocol overhead.

Assumptions

  • Default efficiency is 100%; real transfers are usually slower.
  • Network speeds use decimal bits per second.

Reference sources

Reviewed and updated 2026-07-14

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