File Transfer Time Calculator

How to use this tool

1. Enter the file size and advertised speed in megabits per second.
2. Adjust usable throughput to allow for overhead and calculate.

Things to know

• An estimate, not a network speed test. Latency, congestion and server limits can change the real duration.
• Three bounded decimal values; throughput 0-100 percent with zero rejected. Duration must fit the safe whole-second numeric range.
• Use no more than 200,000 characters across the input and settings.
• Bounded decimal inputs mean at most 120 characters, zero or a magnitude from 10^-100 to 10^100. Arithmetic uses 40-digit precision; exponent suffixes are checked before parsing.