Gain weight and increase strength with Gainz, the simple and easy to use calorie and macronutrient estimator. Simply type in your weight and Gainz will calculate a rough estimate of how many calories you should eat per day to gain mass, along with how much of those calories should come from protein, carbs and fat. Most of the time those who find it hard to build muscle and gain weight are usually not eating enough. Use Gainz to find your bulking macros and in combination with a calorie tracking app such as myfitnesspal and a consistent weight training program you'll be making dem gains in no time!

This calculator provides a good starting point for daily bulking macros - everyone is different so you may need to adjust calories depending on how fast or slow your gains are.