Weight Gain Calculator

Estimate how many weeks it will take to reach your target weight, along with a suggested daily calorie intake.

About This Tool

Gaining weight in a controlled and sustainable way requires an understanding of your daily calorie needs and how they relate to your goals. This weight gain calculator uses your sex, age, height, current weight, and activity level to estimate your Total Daily Energy Expenditure (TDEE). From there, it applies a healthy calorie surplus to determine how quickly you can expect to gain weight.

Because one kilogram of body mass is roughly equivalent to 7700 calories, the tool can estimate your weekly rate of gain and the number of weeks needed to reach your target weight. This provides a practical roadmap for planning meals, training, and progress tracking.

To use the weight gain calculator, enter your personal details and select your activity level. The tool uses the Mifflin–St Jeor equation to estimate your Basal Metabolic Rate (BMR), then multiplies it by an activity factor to determine your TDEE. A calorie surplus is then applied based on your activity level, reflecting how much additional energy your body can typically use for building mass.

The result is an estimate of your weekly weight gain and the total number of weeks required to reach your target. While this tool provides a helpful guideline, individual results vary based on genetics, training intensity, and nutrition quality.

Remember, you should always seek professional advice before making significant changes to your diet or exercise level, especially if you have known health issues.

Sample Weight Gain Timelines

Men: Weight Gain - Male 167cm 75kgs | Weight Gain - Male 167cm 78kgs | Weight Gain - Male 167cm 82kgs | Weight Gain - Male 167cm 86kgs | Weight Gain - Male 170cm 75kgs | Weight Gain - Male 170cm 78kgs | Weight Gain - Male 170cm 82kgs | Weight Gain - Male 170cm 86kgs | Weight Gain - Male 173cm 75kgs | Weight Gain - Male 173cm 78kgs | Weight Gain - Male 173cm 82kgs | Weight Gain - Male 173cm 86kgs | Weight Gain - Male 175cm 75kgs | Weight Gain - Male 175cm 78kgs | Weight Gain - Male 175cm 82kgs | Weight Gain - Male 175cm 86kgs | Weight Gain - Male 177cm 75kgs | Weight Gain - Male 177cm 78kgs | Weight Gain - Male 177cm 82kgs | Weight Gain - Male 177cm 86kgs | Weight Gain - Male 180cm 75kgs | Weight Gain - Male 180cm 78kgs | Weight Gain - Male 180cm 82kgs | Weight Gain - Male 180cm 86kgs | Weight Gain - Male 185cm 75kgs | Weight Gain - Male 185cm 78kgs | Weight Gain - Male 185cm 82kgs | Weight Gain - Male 185cm 86kgs

Women: Weight Gain Female 155cm 55kgs | Weight Gain Female 155cm 58kgs | Weight Gain Female 155cm 60kgs | Weight Gain Female 155cm 65kgs | Weight Gain Female 157cm 55kgs | Weight Gain Female 157cm 58kgs | Weight Gain Female 157cm 60kgs | Weight Gain Female 157cm 65kgs | Weight Gain Female 160cm 55kgs | Weight Gain Female 160cm 58kgs | Weight Gain Female 160cm 60kgs | Weight Gain Female 160cm 65kgs | Weight Gain Female 163cm 55kgs | Weight Gain Female 163cm 58kgs | Weight Gain Female 163cm 60kgs | Weight Gain Female 163cm 65kgs | Weight Gain Female 165cm 55kgs | Weight Gain Female 165cm 58kgs | Weight Gain Female 165cm 60kgs | Weight Gain Female 165cm 65kgs | Weight Gain Female 167cm 55kgs | Weight Gain Female 167cm 58kgs | Weight Gain Female 167cm 60kgs | Weight Gain Female 167cm 65kgs | Weight Gain Female 170cm 55kgs | Weight Gain Female 170cm 58kgs | Weight Gain Female 170cm 60kgs | Weight Gain Female 170cm 65kgs