Reverse Storage Calculator
Reverse Storage CalculatorFrom HDD size, find days of recording. Fast, free and secure — works in your browser. By AK Computer, Dwarka.
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How to use
- 1 Enter the total HDD size you already have installed.
- 2 Enter camera count, resolution, and bitrate.
- 3 Set the codec and recording hours per day.
- 4 Read how many days of footage the disk can hold.
Frequently Asked Questions
How many days of CCTV footage will my hard drive store?
Enter your HDD size along with camera count, resolution, and bitrate, and the calculator estimates the retention in days before the oldest footage is overwritten.
Why did my recorder keep fewer days than expected?
Higher motion, higher bitrate, or continuous 24-hour recording all consume more space, so real retention is often shorter than a best-case estimate.
Can switching to H.265 give me more recording days?
Yes, because H.265 roughly halves the data of H.264 at similar quality, the same disk can typically store close to twice as many days.