More custom macro options
I think the keto calculator is great, but I think the same design principles can be applied to other macro calculations as well. It would be nice to have a calculator that held protein and fat constant and modulated carbs. Many athletes use Xg/kg BW formulas for their fat and protein targets and then modulate the carbohydrates to hit their calorie goal. Some people on weight loss diets would rather hold carbs and fats constant and modulate protein according to calorie goals. It would be nice to have a more modular system that could allow you to plug in different ways of arriving at different macro ratios.