RAID Calculator
Usable total capacity
1000 GB
Read speed
approx. 2.0x
Write speed
approx. 2.0x
Uptime reliability
0 failures (no protection)
RAID Calculator: Calculate Capacity and Fault Tolerance
How much storage space will you actually get? How fast is the system? And how safe is your data? Our RAID calculator provides quick answers. Simply enter your preferred RAID level, the number of drives, and their capacity.
Our RAID tool will then automatically calculate the capacity, read and write speeds, and fault tolerance. All the key values are presented at a glance, allowing you to choose a RAID level without the need for formulas or extra steps.
How to Use the RAID Calculator
- 1.
First, select your preferred RAID level, such as RAID 0, 1, 5, 6, 10, 50, or 60.
- 2.
Next, enter the number of hard drives. Make sure that the RAID level you have chosen supports the number of drives that you want to use.
- 3.
Finally, enter the capacity per drive, such as 2 TB or 500 GB. Note that the RAID calculator assumes all drives are the same size.
How to Interpret the Results
After entering your data, the RAID calculator displays four key values:
Usable total capacity: The actual storage space available for your data, after accounting for mirroring or parity.
Read speed: How much faster your system can read data compared to a single drive.
Write speed: How much faster your system can write data compared to a single drive.
Fault tolerance: The maximum number of drives that can fail simultaneously without data being lost.
To make the results easier to understand, the RAID calculator uses color coding:
Green indicates optimal values for capacity, performance, and security.
Yellow shows acceptable results that could be improved*.
Red warns of critical values, such as low fault tolerance or severely limited performance.
* In practice, improvement isn't always possible due to technical limitations. For example, a RAID 6 system can never match the write performance of a single drive due to the way it works. Performance does not always increase linearly as more drives are added.
