You might find this spread sheet helpful for putting. It's for both speed & break. Just enter the numbers in the colored cells EXCEPT the YELLOW. As for the putter Percentages. If yours are different, change the speed from 20, 40, 60, 80 ,100, 300 to what your putter is & to get the percent to match click on the percent cell. You'll see the formula just below the tool bar. Change only the speed for your putter not the C5. After entering the data to get your speed, all you need to get the break is the dot speed. No need to enter the Green speed, distance & elevation twice. Hope this works for you.
Here's the link for the calculator below. Use Google sheets