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Video Calculators

Recording Time Calculator

How much video or audio fits on a card or drive at a given bitrate.

Enter values

Results update as you type.

Result

Recording time

2 h 54 min 5 s

In minutes
174.1
In hours
2.901
Usable space
121.6 GB
Size per minute
715.26 MB
Size per hour
41.91 GB
Cards needed for 4 hours
2

About the Recording Time Calculator

How much video or audio fits on a card or drive at a given bitrate.

Also known as: how long can i record, card recording time, sd card video time, recording capacity.

How to use this calculator

  1. Enter storage capacity, bitrate, space to keep free.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

seconds = usable bytes × 8 ÷ bitrate in bits per second

Worked example

Using the values pre-filled in the calculator above:

  • Storage capacity = 128 GB
  • Bitrate = 100 Mbps
  • Space to keep free = 5 %

the calculator returns:

  • Recording time: 2 h 54 min 5 s
  • In minutes: 174.1
  • In hours: 2.901
  • Usable space: 121.6 GB