How do you measure?
Measure “Remaining” from ball to outside of hole and be very accurate with this measure.
Find 10 putts from 5 to 20 meters or yards. Which are:
Even | Uphill | Downhill | Side Breaking
Consider to measure the initial distance to hole with a range finder. Or take steps from the hole.
In the calculator the “remaining” can be entered in decimal values. For example 0.6, 1.6 or 2.5 yards or meters.