Stillmore

Free Video Bitrate Calculator

Enter the clip length, file-size budget and audio bitrate to see how many kbps are left for video.

—

Rule of thumb: 1080p wants 4–6 Mbps for motion, 720p about half. If the budget lands below 1.2 Mbps, shorten the clip or drop a resolution step.

How much room is left for the picture?

A 30-second clip with an 8 MB budget has about 2,237 kbps to share. Reserving 128 kbps for the soundtrack leaves an estimated 2,109 kbps for video.

A restaurant walkthrough for a 30-second delivery budget
30 s clip8 MB budget
2,109 kbps for video
Video · 94.3%Audio · 5.7%

How much bitrate can your export afford?

  1. Enter the running time

    Use the length of the finished cut in seconds, including the end card.

  2. Set the file limit

    Enter the size in MB that the finished file needs to fit.

  3. Reserve room for sound

    Enter the audio bitrate in kbps and read the remaining video bitrate.

Choose export settings before the render

A size limit buys fewer bits per second as your video gets longer. Compare cuts before you commit to an export.

Deliver a client proof

Check whether the full presentation can fit the review portal or whether to send a shorter excerpt.

Budget for a voiceover

Enter the audio bitrate from your editor so the video estimate leaves room for speech.

Compare two ad lengths

Keep the same size limit and compare what a 15-second cut and a 30-second cut leave for the picture.

Plan a silent loop

Enter zero for audio when the finished video will have no audio track.

Video bitrate calculator FAQ

Why does the same size limit look fine on a teaser and poor on a full tour?

The longer cut has fewer bits to spend on each second. Set the real duration and reserve room for audio. If the video budget is tight, shorten the cut or reduce its dimensions before encoding.

Do I need to upload my video?

No. The calculator works from duration, target size and audio bitrate.

Is the video bitrate the total bitrate?

No. Total bitrate covers the whole file; the video figure is what remains after subtracting your audio allowance.

Will these settings guarantee the final size?

No. Container overhead and encoder behavior affect the exported file. Leave some room below a hard limit.

What should I enter for a silent video?

Set the reserved audio bitrate to 0 kbps. The estimate then allocates the full bitrate budget to the picture.

Why is the video bitrate negative?

The audio reservation alone exceeds the budget for that duration. Increase the target size, shorten the cut or reserve less for audio.

Should I enter minutes or seconds?

Enter the running time in seconds. For a minute and a half, enter 90. Include any intro and end card that will appear in the export.