Transfer Time Calculator

Estimate file transfer duration from file size, link rate, and protocol overhead.

File sizeLink rateOverhead %

Transfer time1 min 24 s

Seconds84

How to read the result

Time = size × (1 + overhead) / rate. Real transfers vary with congestion, RTT, and window limits.

Example

1 GB @ 100 Mbps + 5% → ~1 min 24 s

FAQ

Bits vs bytes matter?

Yes — 1 GB is 8× larger than 1 Gb. Mixing them up is the most common estimate error.

What overhead should I use?

5% is typical for TCP/IP on clean links; use 10%+ for VPNs or lossy paths.