Weight Gain Calculator

Weight Gain Calculator: Your Ultimate Guide To Healthy Bulking

Gaining weight can be as challenging as losing it, especially for individuals with a fast metabolism or those struggling with appetite issues. But with the right knowledge, a good plan, and a handy tool like a weight gain calculator, the journey to healthy weight gain becomes more manageable.

In this article, we’ll delve into how a weight gain calculator works, discuss the science of weight gain, and offer tips on how to gain weight healthily. We’ll also introduce a practical weight gain calculator to help you on your journey.

Bulking Calculator
Please fill out the form correctly


Start Date (dd/mm/yyyy)
Goal Weight
ERROR: Goal Weight cannot be lesser than Current Weight.
ERROR: Goal Weight cannot be less than Current Weight.
Calorie Surplus
Custom Calories Input
Please enter the amount of Surplus you wish to be at (in calories). E.g. 500
Please enter the amount of Surplus you wish to be at (in percentage). E.g. 15

Formula (optional)
Note: Choose Lean Mass Formula only if you have a fairly accurate estimation of your current body fat.
Body Fat
Note: Please use our Body Fat Calculator to get a more accurate estimation of your body fat %.

Activity Factor
Exercise Factor

Your Stats:

Your BMR is

calculated Your Basal Metabolic Rate is the number of calories required to keep your body functioning at rest, also known as your metabolism.

Your TDEE is

calculated Your TDEE is the amount of calories you need to consume a day in-order to maintain your current weight while performing your daily and exercise activities.

Surplus Calories

calculated Note: You have entered % as your Custom Surplus Calories.

Daily Calories


No. of days to reach your goal


Target date (dd/mm/yyyy)



Determine your daily macronutrient requirements

Select a preset
(carb % / protein % / fat %)

Note: To use a custom Macro setting, please visit our new and improved Macro Calculator.
Carbohydrates20%89 grams
Protein20%178 grams
Fat20%79 grams

What Is A Weight Gain Calculator?

A weight gain calculator is an online tool designed to estimate the number of calories you need to consume daily to increase your weight. This user-friendly calculator considers various factors like your age, gender, current weight, desired weight, activity level, and metabolic rate to provide personalized calorie recommendations for weight gain.

Why Do You Need A Weight Gain Calculator?

Whether you’re an athlete looking to bulk up for better performance, or someone dealing with health issues related to being underweight, a weight gain calculator can be an invaluable tool. It provides a scientific approach to weight gain by giving you a clear, numerical goal to aim for each day. Plus, it takes away the guesswork and reduces the risk of unhealthy weight gain.

How Does A Weight Gain Calculator Work?

A weight gain calculator functions based on several equations to estimate your daily calorie needs for weight gain. Let’s delve into the mechanisms behind these calculations.

Understanding Basal Metabolic Rate (BMR)

Your Basal Metabolic Rate (BMR) is the number of calories your body needs to perform basic functions at rest, such as breathing, circulating blood, and regulating body temperature. The BMR accounts for about 60 to 75 percent of the total calories you burn each day.

Understanding Total Daily Energy Expenditure (TDEE)

Your Total Daily Energy Expenditure (TDEE) is the total number of calories you burn in a day. It factors in your BMR, physical activity level, and the thermic effect of food (calories your body uses to digest and absorb food).

Calculating Weight Gain

To gain weight, you’ll need to consume more calories than your TDEE. Usually, it’s recommended to add an extra 500 to 1000 calories to your TDEE to gain about 1 to 2 pounds per week. Remember, a surplus of approximately 3,500 calories equals about one pound of weight gain.

How To Use A Weight Gain Calculator?

Using a weight gain calculator is straightforward. Here’s a step-by-step guide:

  1. Choose your unit of measurement (Imperial or Metric).
  2. Input your gender, age, current weight, and height.
  3. Enter your target weight and desired pace of weight gain.
  4. Select your daily activity level.
  5. If available, input your body fat percentage.

After providing the necessary information, the calculator will estimate the number of daily calories needed to reach your weight gain goal.

Risks Of Being Underweight

While obesity often takes center stage in health discussions, being underweight can also pose significant health risks. Some of the health issues associated with being underweight include:

  • Malnutrition: Lack of essential nutrients can lead to various health problems.
  • Vitamin Deficiencies: Being underweight often means you’re not getting enough vitamins from your diet.
  • Osteoporosis: Low body mass can increase the risk of bone loss and fractures.
  • Decreased Immune Function: Underweight individuals may have a weakened immune system, making them more susceptible to infections.
  • Fertility Issues: Women who are underweight may have irregular menstrual cycles, which can affect fertility.
  • Increased Surgical Risk: Underweight individuals may face higher risks during surgery, including complications or slower recovery.

Healthy Ways To Gain Weight

The idea is not just to gain weight, but to do it healthily. Here are some tips:

  • Eat More Calories Than Your Body Burns: Use the weight gain calculator to find out how many calories you need to consume daily to gain weight.
  • Choose Nutrient-Rich Foods: Opt for whole grains, lean proteins, fruits, vegetables, and healthy fats. These not only provide calories but also necessary nutrients for your body.
  • Eat More Protein: Proteins are the building blocks of your muscles. Eating sufficient protein can help ensure the extra calories don’t just end up as body fat.
  • Exercise Regularly: Engaging in resistance training or weight lifting can help ensure that the extra calories go to your muscles instead of just your fat cells.

How Fast Can I Gain Weight?

The speed at which you gain weight largely depends on your caloric intake and metabolism. However, a healthy weight gain is generally around 1 to 2 pounds per week.

Weight Gain Calculator: A Practical Tool For Your Weight Gain Journey

A weight gain calculator is a practical tool that can help guide your weight gain journey. It provides a clear numerical goal for daily caloric intake, making the process of gaining weight more systematic and manageable.

Remember, gaining weight is a marathon, not a sprint. It’s important to aim for a slow and steady gain, rather than quick and unhealthy weight gain. With patience, persistence, and the right tools like a weight gain calculator, you can achieve your weight gain goals in a healthy way.

In conclusion, whether you’re trying to bulk up, dealing with health issues related to being underweight, or just want to add a few pounds, understanding your calorie needs is crucial. A weight gain calculator can provide you with the guidance you need, helping you achieve your weight gain goals in a healthy, sustainable way.

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