Mbps, Bandwidth, and Download Time

Internet plans quote bits; files usually show bytes.

Eight bits make one byte. Decimal GB and binary GiB are also different. State the unit before calculating so an apparent shortfall is not a notation mistake.

File bits divided by megabits per second gives seconds.

A 1 GB decimal file contains 8,000 megabits, so 100 Mbps needs at least 80 seconds. That result assumes the full entered rate carries file payload.

Protocols, Wi-Fi, server limits, and congestion reduce payload rate.

Use an efficiency assumption or, better, enter observed throughput. The calculator states its assumption and never promises an exact completion time.

Latency and throughput serve different experiences.

Bulk downloads depend strongly on sustained throughput, while calls and games also depend on latency, jitter, and loss. A single “fast” label cannot summarize both.