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This free video bitrate calculator finds the average video bitrate available for a target file size and duration. Enter the length of your video, storage limit and audio bitrate to calculate a practical data-rate target directly in your browser.
Start with the duration and target file size. The calculator reserves the selected audio bitrate and shows the average bitrate remaining for the video stream.
The calculator works backward from the amount of storage available. A target file size represents a fixed quantity of data. Once the duration is known, that data can be divided across every second of the video to find the average total bitrate available.
Because a finished media file can contain both picture and sound, the selected audio bitrate is reserved first. The remainder becomes the approximate average bitrate available to the video stream.
Set the total running time in hours, minutes and seconds.
Enter the storage target in MB, GB, MiB or GiB.
Choose the audio bitrate that will share the file with video.
The remaining average data rate is displayed in Mbps.
For other practical browser utilities, explore Audio Tools for Recording, Mixing, and Ear Training or experiment with level relationships using the Interactive Online Audio Mixer.
A bitrate target is useful when the final file must fit within a known storage allowance. Instead of choosing a data rate first and discovering the resulting size afterward, you can start with the space available and calculate the average rate that fits it.
This is especially helpful for long videos because small changes in average bitrate accumulate over the entire running time. Increasing the target size gives the streams more available data, while extending the duration spreads the same amount of data across more seconds.
Sound remains part of that calculation. Projects involving narration or spoken material may also benefit from the information on Audio Content Recording Services and Russian voice-over recording.
The main result is the average bitrate available to the video stream, but several related values can make the result easier to inspect. They describe the same data allowance from different perspectives.
The calculated average rate remaining for the video stream after the selected audio rate is reserved.
The average data rate represented by the target size and duration before audio is subtracted.
Video bitrate divided by frame rate shows the mathematical average number of video bits available per frame.
Bits per frame should not be interpreted as a promise that every encoded frame receives exactly the same amount of data. Modern encoding can distribute data unevenly between frames. The value is simply a useful average derived from bitrate and frame rate.
You can explore the Mixer Console Simulator, learn about vocal and speech recording, or read about mixing and mastering for a broader view of the soundtrack workflow.
These three values are directly connected. If duration remains fixed and the target file size increases, more average bitrate becomes available. If file size remains fixed while duration increases, the available bitrate decreases.
That makes the calculator useful for comparing alternatives. You can change one input at a time and immediately see how the available video data rate responds.
For example, doubling the storage allowance while keeping duration and audio settings unchanged increases the total available data rate. Doubling the duration while keeping the same storage allowance does the opposite.
Creators preparing a first recording project can also read the First Time Recording Studio Guide, while musicians planning instrumental sessions can explore instrument recording.
These examples show how duration and target storage affect the calculated average video bitrate. Each example reserves 320 kbps for audio.
| Duration | Target size | Audio | Total bitrate | Video bitrate |
|---|---|---|---|---|
| 5 minutes | 500 MB | 320 kbps | 13.333 Mbps | 13.013 Mbps |
| 10 minutes | 1 GB | 320 kbps | 13.333 Mbps | 13.013 Mbps |
| 30 minutes | 2 GB | 320 kbps | 8.889 Mbps | 8.569 Mbps |
| 1 hour | 4 GB | 320 kbps | 8.889 Mbps | 8.569 Mbps |
Notice that 500 MB over five minutes produces the same average data rate as 1 GB over ten minutes. In both cases, the storage allowance and duration increase in the same proportion.
If your project also involves music production, you can explore song demo production or read about recording blues and country music.
The calculator performs all arithmetic locally in the browser. No video or audio file is needed because bitrate can be derived from the numeric values alone.
Entering the target size in MB or GB uses decimal storage units. MiB and GiB are also available when you want the calculation expressed with binary storage units. The calculator converts the selected unit to bytes before determining the total available bitrate.
The Copy Result button provides a compact summary containing the duration, target size, audio rate, frame rate and calculated video bitrate, making it easy to move the result into notes or another part of your workflow.
For artists interested in the human side of recording as well as technical preparation, Musician Psychology and Recording Confidence discusses preparation and confidence in the studio.
The calculated bitrate is a mathematical average based on the duration and storage allowance you enter. It is useful for planning an encoding target, but the final size produced by an encoder can differ from a simple arithmetic estimate.
Variable bitrate encoding can distribute data differently throughout a video, and a finished container may include metadata, subtitles, extra audio streams or other information. If a file must remain below a strict storage ceiling, leaving some space for additional container data is more cautious than assigning every available byte to the video and audio streams.
Video bitrate describes how much video data is used over time. It is commonly expressed in kilobits or megabits per second.
The target storage is converted to bits and divided by the duration in seconds. That gives the available total bitrate. The selected audio bitrate is then subtracted to estimate the amount remaining for video.
Not in this calculation. The main video bitrate is determined by storage, duration and reserved audio data. Frame rate is used only to express that calculated video bitrate as an average number of bits per frame.
Video and audio both consume part of the available file size. Reserving the audio stream prevents the entire data allowance from being incorrectly assigned to video.
No. The calculation only requires numeric values, so no media file is uploaded or processed.
Browse Audio Recording, Mixing & Mastering Services, learn about planning a focused recording day away from home, or explore vocal recording information for New York singers.
Set the duration, storage target and audio rate to calculate the average bitrate available for the video stream, then adjust the values to compare different export plans.
Go beyond individual audio tools. Arrange multiple tracks, edit clips, build modular effect chains, add modulation, mix through a Master bus, save projects and export the finished mix to WAV.
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