Donaldson R F Download Time Calculator
Enter a file size and your connection speed to see how long a download or upload will take.
The same file at other speeds
Megabits versus megabytes
Internet speeds are quoted in bits per second (Mbps) but file sizes are in bytes (MB). There are 8 bits in a byte, so a 100 Mbps connection can move at most 12.5 MB every second. Real downloads are a little slower because of protocol overhead, Wi-Fi conditions and server limits, which is why an overhead figure of 5–10% is included.
Time = size in bits ÷ (speed in bits per second × (1 − overhead)). Uploads work the same way with your upload speed, which on most UK broadband is much lower than the download speed. Use our internet speed test to measure yours.