Here are some of the links I have for IOPS calculators on my site:

https://techish.net/hardware/raid-iops-mbps-and-more-excel-cheat-sheet/
https://techish.net/hardware/iops-calculator-and-raid-calculators-estimators/

Some useful information on some of the graphing I had done with SQLIO measurements

https://techish.net/windows/sqlio-scripts-and-graphs/
https://techish.net/windows/visualizing-sqlio-disk-benchmark-results-using-a-pivotchart/

Testing Disk IO in Linux

https://techish.net/linux/testing-disk-in-linux-using-fio/