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This free video file size calculator estimates how much storage a video will require from its duration, video bitrate and audio bitrate. Enter your values to compare MB, GB and GiB before exporting, transferring or storing a video.
Calculate estimated storage from bitrate, or start with a target file size and calculate the video bitrate available for that limit.
A compressed video's approximate size can be calculated from how much data is used each second and how long the video runs. The calculator combines the selected video bitrate and audio bitrate, multiplies that total data rate by the duration, and converts the result into storage units.
For example, a video stream at 10 Mbps with a 320 kbps audio stream has a combined bitrate of 10.32 Mbps. A ten-minute duration contains 600 seconds, so the estimated payload is approximately 774 MB when decimal megabytes are used.
If you want to explore other browser-based production utilities, visit Audio Tools for Recording, Mixing, and Ear Training. You can also experiment with signal levels in the Mixer Console Simulator.
Duration alone cannot determine the size of a compressed video. Two files can run for exactly the same amount of time while using very different amounts of storage because their bitrates differ. Increasing the average bitrate increases the amount of data stored for each second of playback.
If the combined bitrate doubles while duration remains unchanged, the mathematical size estimate doubles as well. Likewise, a 30-minute file at a fixed bitrate requires three times the data of a 10-minute file at that same bitrate.
Longer running time means more seconds during which video and audio data must be stored.
The video stream is usually the largest part of the calculated total for ordinary compressed video.
Audio also contributes to the total size and should be included when estimating the complete media file.
For projects where the soundtrack matters as much as the picture, explore Audio Content Recording Services, read about voiceover recording, or learn more about commercial audio and presentation recording.
File-size estimation is useful before an export because it lets you compare different data rates without repeatedly rendering the entire project. You can enter the intended duration and bitrate, then immediately see the approximate storage required.
This can help when planning available disk space, preparing a transfer, comparing export settings or deciding whether a particular bitrate is practical for a known storage limit.
If you already know the maximum file size, switch to Target Size → Bitrate. The calculator subtracts the selected audio data rate and shows the remaining average video bitrate available for the entered duration.
For broader production planning, you can read the First Time Recording Studio Guide or learn how recording-session length can vary. Musicians can also explore song, track and instrument recording.
The relationship between bitrate, duration and storage is linear when the calculation uses a constant average data rate. The examples below use the displayed bitrate as a mathematical average and are intended to show how the relationship behaves.
| Duration | Video | Audio | Total bitrate | Estimated size |
|---|---|---|---|---|
| 1 minute | 5 Mbps | 128 kbps | 5.128 Mbps | 38.46 MB |
| 10 minutes | 10 Mbps | 320 kbps | 10.32 Mbps | 774 MB |
| 30 minutes | 25 Mbps | 320 kbps | 25.32 Mbps | 5.697 GB |
| 1 hour | 50 Mbps | 320 kbps | 50.32 Mbps | 22.644 GB |
Real encoded files can differ from a simple estimate. Variable bitrate encoding changes the data rate over time, and media containers can add additional information beyond the video and audio streams themselves. The calculator is therefore most useful as a storage estimate based on the average bitrates you provide.
This video file size tool performs the arithmetic directly in your browser. There is no need to upload a video because the calculation only requires duration and data-rate values.
The result is shown in both decimal and binary storage units. MB and GB use powers of 1000, while MiB and GiB use powers of 1024. Showing both makes it easier to understand why storage figures can appear slightly different depending on the unit convention being used.
If you are learning how different parts of an audio production interact, try the Interactive Online Audio Mixer. For completed music projects, you can also read about mixing and mastering and song demo production.
A bitrate calculation gives a strong mathematical estimate when you know the average amount of data used per second. It does not, however, predict every detail of an encoder's final output.
Variable bitrate encoding can allocate more data to complex passages and less data to simpler sections. The final container can also include metadata, subtitles, additional audio streams or other information. Those elements can make the finished file somewhat different from the basic video-plus-audio calculation.
Audio-focused creators may also find the vocal and speech recording guide useful. If travel is part of a recording project, see the recording information for New York artists or the vocal recording travel guide.
Add the video and audio bitrates, multiply the combined bitrate by the video's duration in seconds, and divide the resulting bit count by eight to convert bits to bytes.
Not by itself. Resolution can influence the bitrate you may choose, but two videos with the same duration and average total bitrate have approximately the same calculated payload even if their resolutions differ.
The audio stream occupies storage too. Adding its bitrate to the video bitrate produces a more complete estimate than calculating the video stream alone.
Yes. Choose Target Size → Bitrate, enter the duration, target storage size and audio bitrate, and the calculator shows the approximate average video bitrate remaining.
No. The calculation is based entirely on the values you enter, so no media upload is required.
Browse audio recording, mixing and mastering services, explore recording approaches for different music genres, or learn about recording options for international artists.
Enter the duration and bitrates to calculate an approximate file size, or work backward from a storage limit to estimate the available video bitrate.
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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