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Video File Size & Bitrate Calculator

File size from bitrate and duration — or the bitrate to hit a size cap.

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Rex says

Everyday utility math — the kind you'd otherwise pull up four browser tabs for. I keep it to one clean answer.

Try a scenario

Click to load — tweak from there.

Inputs

Result

File size (GB)

1.811

File size (MB)

1854.5

MB per minute

185.4

Bitrate to hit your size cap (Mbps)

27.64

Minutes that fit on the card

707

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How to use this

  1. 1Enter duration (min).
  2. 2Enter video bitrate (Mbps).
  3. 3Enter audio bitrate (kbps).
  4. 4Enter target file size cap (GB).
  5. 5Enter card / drive capacity (GB).
  6. 6Read your file size (gb) on the right — it updates as you type.
  7. 7Hit Share to keep the scenario or send it to someone.

About this calculator

Every upload limit, SD card, and delivery spec is really a bitrate question. Enter duration and bitrate to get file size, or work backward from a target size to find the bitrate that fits.

FormulaSize (MB) = (video kbps + audio kbps) × seconds ÷ 8 ÷ 1024.

Worked example

Using the values the calculator loads with:

Inputs

  • Duration: 10 min
  • Video bitrate: 25 Mbps
  • Audio bitrate: 320 kbps
  • Target file size cap: 2 GB
  • Card / drive capacity: 128 GB

Results

  • File size (GB): 1.811
  • File size (MB): 1,854.5
  • MB per minute: 185.4
  • Bitrate to hit your size cap (Mbps): 27.64
  • Minutes that fit on the card: 707

What each field means

Inputs

Duration (min)
The duration used in the calculation, measured in min. Starts at 10 min so you have a working example on load.
Video bitrate (Mbps)
The video bitrate used in the calculation, measured in Mbps. Starts at 25 Mbps so you have a working example on load.
Audio bitrate (kbps)
The audio bitrate used in the calculation, measured in kbps. Starts at 320 kbps so you have a working example on load.
Target file size cap (GB)
The target file size cap used in the calculation, measured in GB. Starts at 2 GB so you have a working example on load.
Card / drive capacity (GB)
The card / drive capacity used in the calculation, measured in GB. Starts at 128 GB so you have a working example on load.

Results

File size (GB)
Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
File size (MB)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
MB per minute
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Bitrate to hit your size cap (Mbps)
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
Minutes that fit on the card
Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.

FAQ

What bitrate should I export for YouTube?

YouTube's own guidance is roughly 8 Mbps for 1080p30, 12 for 1080p60, 35–45 for 4K30, and 53–68 for 4K60 in SDR. Uploading higher costs you nothing but time — YouTube re-encodes anyway.

Why is my camera file so much larger than my export?

Camera codecs like ProRes or 10-bit All-I run at 200–800 Mbps because they are optimized for editing, not delivery. Delivery codecs like H.264/H.265 use inter-frame compression at a fraction of the data rate.

Accuracy and limitations

  • Estimates assume standard, average conditions — local rules, pricing, and materials vary.
  • Results are rounded for readability; add a buffer before ordering, booking, or committing.
  • Double-check anything with a real cost attached against a local quote.

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Cite this calculator

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APA
RevenueLab. (2026). Video File Size Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/video-file-size
HTML
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/video-file-size" target="_blank" rel="noopener">Video File Size Calculator — RevenueLab</a> (2026).</p>
Markdown
Source: [Video File Size Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/video-file-size) (2026).
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