Calculate macros and calories for Jeff Nippard's recomposition diet plan

diet_calculator.py

import math

weight_lb = 208.2  # pounds
height_in = 72  # inches
neck_in = 16.5  # inches
waist_in = 44  # inches
age = 37  # years

deficit_percentage = 20


def __get_calories():
    weight_kg = weight_lb / 2.20
    height_cm = height_in * 2.54

    return round((10 * weight_kg + 6.25 * height_cm - 5 * age + 5) * 1.2 * ((100 - deficit_percentage) / 100))


def __get_body_fat():
    return round(86.010 * math.log10(waist_in - neck_in) - 70.041 * math.log10(height_in) + 36.76)


def __get_lbm():
    return weight_lb - weight_lb * __get_body_fat() / 100


def __get_protein():
    point_one_x = 5
    point_one_y = 1.6

    point_two_x = 30
    point_two_y = 1.2

    lbm = __get_lbm()
    body_fat = min(point_two_x, __get_body_fat())

    slope = (point_two_y - point_one_y) / (point_two_x - point_one_x)
    ratio = math.fabs(slope * (point_one_x - body_fat) - point_one_y)

    return round(ratio * lbm)


def __get_fat():
    point_one_x = 5
    point_one_y = 20

    point_two_x = 25
    point_two_y = 35

    body_fat = min(point_two_x, __get_body_fat())

    slope = (point_two_y - point_one_y) / (point_two_x - point_one_x)
    percentage = round(math.fabs(slope * (point_one_x - body_fat) - point_one_y), 2)

    return round(percentage / 100 * __get_calories() / 9)


def __get_carbs():
    protein_cals = __get_protein() * 4
    fat_cals = __get_fat() * 9

    return round((__get_calories() - protein_cals - fat_cals) / 4)


def main():
    print(f"Protein: {__get_protein()}g")
    print(f"Fat: {__get_fat()}g")
    print(f"Carbs: {__get_carbs()}g")
    print(f"Calories: {__get_calories()}")


main()