Internet providers sell you megabits. Downloads happen in megabytes. Somewhere in that factor of eight lives the disappointment you felt watching a game crawl at “full speed.” The Gizmo 421 Bandwidth Calculator converts between every common unit and tells you exactly how long that file will really take.
Unit converter
So 100 Mbit/s ≈ 12 MB/s. Bits for connection speed, bytes for file sizes — divide by 8 to cross over.
How long will this download take?
What speed do I need?
Convention: connection speeds in decimal units (1 Mbit/s = 1,000,000 bit/s), file sizes in binary units (1 MB = 1,048,576 bytes) — matching what browsers and download managers actually show.
The two sections work both directions: pick a file size and a connection speed to get the real-world download time, or flip it around and ask what speed you would need to pull that file in an hour. Perfect for deciding whether the fiber upgrade is worth it, or for proving to the internet provider that “up to 300 Mbps” was never the number you were getting.
How many MB/s is my 100 Mbps plan? 100 megabits per second is about 12 megabytes per second — the converter does it exactly. Why is my download slower than advertised? Advertised speeds are best-case, in bits; servers, Wi-Fi, and overhead eat into the real byte rate. How long does a 75 GB game take at 100 Mbps? About an hour and forty-seven minutes in a perfect world — the calculator gives the theoretical floor.