I just calculate it by weight so if im sitting at 230lbs and im bulking with a 500 caloric surplus, the calculations will be as so:
230 x 15 (maintainence) = 3450 calories
3450 + 500 (surplus) = 3950 calories
230 x 0.50 (fat) = 115g
230 x 1.2 (protein) = 276g
115 x 9 = 1035 (fat calories)
276 x 4 = 1104 (protein calories)
1035 + 1104 = 2139
3950 - 2139 = 1811 (carb calories)
1811 / 4 = 452.75 (carbs)
So at 230lbs ill be eating 3950 cals, 276g protein, 115g fat, and 453g carbs... ill check if i calculated right by adding it up
276 x 4 = 1104
115 x 9 =1035
453 x 4 = 1812
1104 + 1035 + 1812 = 3951
so its good...
and from there ill just use those numbers as a base, depending on how i look in the mirror and on the scale ill either add 25g carbs or take away.. etc or even 50g+ carbs add or take away.
its the same formula for my calculating my cutting base numbers but it'll just be tweaked a bit more (maybe reduce the fats to fit in more carbs or increase the fats to take away some carbs) and depending on my metabolism ill multiply my weight by either 14-16 for my maintenance starting point... usually for some reason its 15 on my bulks as 16 gets me too fat and 14 for my cuts. and yeahhh
didnt proof read that shit, hope its correct ahaha