Bitrate Calculator

It takes File size and Duration and derives Bitrate and Bitrate from them. The calculation is live as you type, so the result updates on every change.

2 values: File size (MB) and Duration (s). Nothing else is required — no account, no file upload.

With File size = 100 MB and Duration = 120 s, the calculator returns Bitrate = 6.667 Mbps and Bitrate = 6,667 kbps. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

Enter File size MB and Duration s. Metric and US units are both supported — switch system and the figures convert for you.

Finding out how big a thing will be before you make it: how many gigabytes an hour of footage takes, how long a file needs on the connection you have, how large a photo prints before it goes soft, what bitrate fits the budget you were given.

Taking the advertised connection speed as the transfer speed. A 100 Mb/s line is megabits, the file is in megabytes, and the eight-fold difference between them is where most download estimates go wrong — before overhead and contention take their own share.

This one returns Bitrate and Bitrate; the Audio file size calculator returns File size (MB). That is the whole difference — open the one whose figure you need.

Video file size calculator is the closest one after this: Estimate a video's file size from its duration and bitrate.

Download time calculator and Upload Time Calculator — they come up in the same task often enough to be worth a second tab.

Byte prefixes follow the IEC convention where a kibibyte is 1 024 bytes and a kilobyte is 1 000 — drive makers use the second, operating systems often report the first, and a disk that shrinks on arrival is that gap and nothing else. Print sizing assumes 300 dpi unless you change it.