Hi
I got the formula off of this website i think for iWatcher and it appears to be accurate.
Go into calculator and configure
Change Field 1 to Protein and divide by 10.99
Change Field 2 to Carbs and divide by 9.17
Change Field 3 to Fat and divide by 3.89
Change Field 4 to Fibre and divide by 34.48
Turn Half-Point Rounding to ON
(just looking at my phone, so hope its still right, lol!)
If it gives you half point values (i.e 9.5pts) round up to say 10 and that is the new propoint value.
Hope this helps
Sue.