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Calculation Machine

Video File Size Calculator

Storage needed for any bitrate and duration.

Reviewed by James Whitfield · How we check our maths

Your values

ⓘ Live results

Results
File size
11.06 GB
Per minute
377.4 MB
Hours on a 1 TB drive
46.3
Upload time at 20 Mbps
75.5 minutes

Quick answer

Video file size is bitrate × duration; at 4K 100 Mbps, one minute consumes about 750 MB.

The formula

Size (MB) = bitrate (Mbps) × seconds ÷ 8

Worked example

Worked example

Using the values the calculator loads with.

Inputs

  • Video bitrate50 Mbps
  • Duration30 minutes
  • Audio bitrate320 kbps

Result

  • File size11.06 GB
  • Per minute377.4 MB
  • Hours on a 1 TB drive46.3
  • Upload time at 20 Mbps75.5 minutes

How to use the Video File Size Calculator

  1. 1Enter your recording bitrate.
  2. 2Enter the duration in minutes.
  3. 3Add the audio bitrate for an accurate total.

Frequently asked questions

What bitrate should I record at?

1080p30 looks good at 8–12 Mbps for delivery; 4K editing masters usually run 50–100 Mbps or higher.

Does resolution alone determine size?

No — bitrate does. A low-bitrate 4K file can be smaller than a high-bitrate 1080p file, but it will look worse.

About this calculator