How to estimate a download's duration

1. Size in MB

   "Size (MB)" is the file size in MEGABYTES (1 MB = 1,000,000 bytes here). A 4 GB game is 4,000 MB. The tool doesn't disambiguate decimal MB vs binary MiB — pick one.

2. Speed in Mbps

   "Speed (Mbps)" is your connection's downlink in MEGABITS per second (note the lower-case 'b'). 100 Mbps fiber = 100, gigabit = 1000. Zero throws "Speed must be > 0."

3. Press Run

   Result is secondsApprox = (sizeMb × 8) / speedMbps, rounded to 1 decimal. The `× 8` converts MB to Mb so the units cancel.

4. Why your download takes longer

   ISP-advertised speeds are peak, not sustained. TCP slow-start, server limits, Wi-Fi loss, and disk write speed all add overhead. Expect actual times 10–30% above this estimate on typical residential links.