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Video File Size Calculator

Video and audio bitrate plus running time in, file size out.

Mbps
kbps

h:mm:ss, mm:ss, or plain minutes.

File size

609.6MB

Scale

Not to scale

All results
In megabytes609.6MB
As Windows shows it (GiB)0.57GiB
Per minute61MB
Duration10:00

File size = bitrate × duration ÷ 8. Bitrates are in bits per second; files are measured in bytes, and a byte is 8 bits. A 10-minute video at 8 Mbps with 128 kbps audio comes to about 610 MB.

How it works

size (bytes) = (video + audio bitrate) × seconds ÷ 8

Worked example

With 10 minutes of video at 8 Mbps with 128 kbps audio:

  1. Total bitrate: 8 Mbps + 128 kbps = 8.128 Mbps.
  2. Bits: 8.128 Mbps × 600 s = 4,876.8 megabits.
  3. Bytes: ÷ 8 = 609.6 MB.

When you need this tool

Planning storage for a shoot, checking whether an export will fit an upload limit, or choosing a bitrate for streaming. Encoders ask for a bitrate; storage and upload forms think in megabytes and gigabytes.

How it’s calculated

  1. Add the video and audio bitrates (in bits per second).
  2. Multiply by the running time in seconds to get total bits.
  3. Divide by 8 for bytes, then by 1,000,000 for megabytes.

The result uses decimal MB and GB, like upload sites and storage labels. Windows will show a slightly smaller number in its binary units.

Typical bitrates

  • 720p web video: 3–5 Mbps
  • 1080p (upload quality): 8–12 Mbps
  • 4K (upload quality): 35–45 Mbps
  • Audio (AAC stereo): 128–256 kbps

Common mistakes

Forgetting to divide by 8. A 100 Mbps stream is 12.5 MB each second, not 100 MB.

Using the camera’s bitrate for exports. Cameras record at high bitrates for editing; exports for the web are usually far smaller.

To see how long an upload or download will take, use the download time calculator.

Questions

What bitrate should I use for 1080p?

About 8 Mbps for 1080p at 30 fps is a common upload target; YouTube recommends 8 Mbps for 1080p SDR at 24–30 fps.

How big is an hour of 4K video?

At 35–45 Mbps, roughly 16–20 GB per hour. Camera files at higher bitrates are much larger.

Why is my file bigger than calculated?

Variable bitrate encoding, container overhead and extra audio tracks all add a little. The estimate is usually within a few percent.

What is the difference between Mbps and MB/s?

Mbps is megabits per second; MB/s is megabytes per second. Divide Mbps by 8 to get MB/s.

Last reviewed 2026-09-24. How we check values · Report a problem with this page

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