Video Bitrate Calculator

Estimate your video's file size from its duration and bitrate — or find the maximum bitrate that fits a target file size.

Enter duration & bitrate...

What is Video Bitrate?

Bitrate is the amount of data used per second of video, measured in megabits per second (Mbps). A higher bitrate preserves more detail and produces fewer compression artifacts, but it also creates larger files. Choosing the right bitrate is a balance between visual quality, upload time, and storage.

How to Use This Calculator

  1. Bitrate → File Size: Enter your video's duration, pick a resolution/fps preset (based on YouTube's recommended upload bitrates), and choose an audio bitrate. The tool instantly estimates your final file size.
  2. Target Size → Bitrate: Have a 1 GB upload limit? Enter your duration and target size, and the tool tells you the maximum combined bitrate you can export at without exceeding it.

Frequently Asked Questions

How do I calculate video file size from bitrate?

Multiply the bitrate in Mbps by the duration in seconds, then divide by 8 to get megabytes. Example: 10 Mbps × 3600 seconds ÷ 8 = 4,500 MB (about 4.4 GB).

What bitrate does YouTube recommend for 1080p 60fps?

YouTube recommends 12 Mbps for 1080p at 60fps and 8 Mbps for 1080p at 30fps. For 4K, use 35–45 Mbps at 30fps or 53–68 Mbps at 60fps.

Does a higher bitrate always mean better quality?

Not always. Beyond a certain point, quality gains become invisible while file sizes keep growing. Use the recommended bitrate for your resolution and frame rate instead of maxing it out.

What is the difference between Mbps and MB/s?

Mbps measures megabits per second, while MB/s measures megabytes per second. One byte equals 8 bits, so divide Mbps by 8 to get MB/s. That is why file size equals bitrate × seconds ÷ 8.