Data Transfer Calculator

Your details

Choose what you want to find out.
The total size of the data to transfer.
Your connection or device transfer speed.
Real-world transfers are slower than the rated speed due to protocol headers, retransmits, and congestion. Overhead reduces the effective throughput.
Transfer time
1m 20s

Estimated time to complete the transfer at the given speed

Transfer time (seconds)80s
Effective speed100Mbps
File size (bits)8,000,000,000
Effective speed (Mbps)100
Transfer time (s)80

Estimated transfer time: 1m 20s

  • Your effective throughput is 100.00 Mbps after 0% overhead.
  • About 1 minutes: reasonable for a typical home connection.
  • Rated connection speeds rarely match real-world throughput. Enable the overhead option to account for protocol headers, TCP retransmits, and network congestion.

Next stepRun a speed test immediately before a large transfer to get your actual throughput, then re-enter the measured speed here.

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