Bodybuilding Weight Calculator (Set Accurate Goals)

With years of experience in the fitness and nutrition industry and as a certified personal trainer, I've seen firsthand how the body mass index (BMI) influences training and diet decisions.

That's why I dedicated myself to helping others achieve their fitness goals.

The bodybuilding weight calculator is a prime tool that helps you achieve fitness objectives.

Much like the basal metabolic rate (BMR) calculator, it offers insights into the calories required for specific purposes, whether losing fat or building muscle.

Start making informed decisions that align with your body and let you achieve that lean physique you're looking for with the proper knowledge. 

Here, I show you how to use the weight calculator and tailor the information to your training routines.

Quick Summary

  • The bodybuilding weight calculator determines the calories required for weight goals.
  • It uses multiple formulas like the Broca Index, Devine Formula, and Robinson Formula.
  • The IBW could optimize food choices and exercise strategies, ensuring effective muscle gain or weight loss outcomes.

What is a Weight Calculator?

A weight calculator, often called one of the essential caloric counters, determines how many calories you need to sustain your body and lose weight or gain weight.

By considering parameters such as age, gender, height, weight, and activity level, it precisely estimates how many calories you should consume daily [1].

It offers a clear insight into daily caloric needs, allowing individuals to effectively tailor their training and nutrition strategies.

How to Use TotalShape’s IBW Calculator

The TotalShape’s IBW Calculator is designed to determine the optimal weight range based on height and gender.

Here's how to use it:

  1. Enter Your Gender: Select your gender, as men and women have distinct ideal mass ranges due to different body compositions.
  2. Input Your Height: Provide your height in feet and inches or centimeters.
  3. Choose a Formula: Opt for one of the three available formulas: Broca Index, Devine Formula, or Robinson Formula.
  4. Review Your Results: The calculator will display your ideal size range, factoring in aspects like bone structure and blood circulation.

What Does the Results Mean?

The results are a guideline that influences your dietary and exercise decisions. 

If your current size exceeds the suggested range, it indicates a potential need for weight loss. You can achieve this through a caloric deficit diet, exercise, or both. Consider a caloric surplus if you're below the range, especially if muscle building is a goal [2].

If the weight calculator isn't enough, you could use tools like the TDEE calculator or a macro calculator that includes total daily energy expenditure (TDEE) to guide your daily caloric intake based on activity and objectives. Exercise, paired with appropriate food choices, ensures effective weight management.

Ideal body weight (IBW) is defined as weight for height at the lowest risk of mortality... The cost-effective and efficient nature of the IBW model has provided healthcare practitioners and researchers a practical method of risk assessment... It is not the intent of this text to deprive healthcare practitioners and researchers of numerical domains for risk assessment, but instead to draw attention to the complexity and overall discussion of utility of the IBW method.

- Hubbard J, Director of Metabolism & Nutrition Research

Formulas to Calculate Body Weight

Determining ideal body weight involves various formulas recognized by the fitness community, and tools like the BMI calculator can further assist in understanding one's health in relation to weight.

These formulas are integral to many energy estimators and are designed to give you your ideal body weight.

These formulas consider age and gender, allowing you to align your size goals, especially when combined with a high-protein diet and regular exercise. 

There are three formulas to consider when calculating your weight:

  1. Broca's Index: This formula is straightforward and is calculated as [Height (cm) - 100]. It provides a quick estimate of ideal weight and is mainly used in medicine.
  2. Devine Formula: Introduced in the 1970s, the formula for men is IBW = 50.0 + 2.3 x (ht – 60 in), and for women, it's IBW = 45.5 + 2.3 x (ht – 60 in), where "ht" stands for height in inches.
  3. Robinson Formula: Developed in the 1980s, the formula for men is IBW = 52 + 1.9 x (ht – 60 in), and for women, it's IBW = 49 + 1.7 x (ht – 60 in).

Which Method is More Accurate?

There's no clear answer about which method is more accurate because each has unique scientific principles and offers insights into weight calculation. Still, their precision differs based on the variables they consider.

Broca's Index

One of the first pioneering methods for weight estimation. It provides a straightforward calculation but doesn't account for factors like muscle mass or fat distribution, which are crucial in today's diverse population.

Devine Formula

It was developed for medicinal dosing purposes, particularly in drug administration. It emphasizes height as a core factor, making it a reliable choice, especially in clinical settings requiring rapid estimations.

Robinson Formula

The formula incorporates more recent understandings of human physiology. It's tailored to reflect modern lifestyles, considering factors that earlier procedures might overlook, thus offering a more comprehensive approach to weight estimation [3].

In my expert opinion, the Robinson formula is the most effective due to its physiological knowledge and widespread acceptance in the medical community.

IBW Tips for Building Muscle

Achieving the ideal body weight (IBW) is a goal based on body mass percentage and objectives.

Here are four tips you could follow to improve your muscle growth results.

  1. Understand Your Starting Point: Assess your body mass before setting muscle-building goals.
  2. Set Realistic Goals: Tailor expectations to goals that you can commit to.
  3. Monitor and Adjust: Regularly check your progress and adjust your training and nutrition.
  4. Approach Based on Body Composition: A muscle-building strategy based on a person's initial body composition is essential. For example, obese individuals might need to reduce their body fat percentage before tackling muscle building. In contrast, someone with a lower body fat percentage can directly aim for mass gain.

Basal Metabolic Rate vs Ideal Body Weight

When diving into fitness and health, many often confuse BMR with IBW. They are essential metrics but serve different purposes. 

BMR provides insight into how many calories your body needs at rest, while IBW gives a target weight to reach. Understanding this accelerates fitness goals. 

Here's a clear pros and cons comparison between these methods:





  • Provides insight into daily caloric needs at rest.
  • Helps in tailoring diet plans based on energy expenditure.
  • Universally recognized and used in the fitness community.
  • Doesn't account for physical activity.
  • Can vary based on factors like muscle mass and age.
  • Needs regular updating as weight and lifestyle change.


  • Gives a target weight based on height and gender.
  • Useful for setting fat loss or weight gain goals.
  • Can be used to determine if one is underweight, normal, or overweight.
  • Doesn't consider body composition (muscle vs fat).
  • Might not be accurate for all body types.
  • Doesn't account for individual health conditions or goals.


Is The IBW a Calorie Calculator?

No, the IBW calculates optimal weight based on height and gender. In contrast, calorie calculators determine daily caloric intake based on age, activity level, and mass goals.

How Can I Know My IBW?

You can know your IBW using an ideal body weight calculator.

Why Should I Calculate My IBW?

You should calculate your IBW to obtain insights into your optimal weight range for health and fitness goals and get data to set realistic nutrition targets.

Control The Number of Calories With Your IBW

The ideal body weight (IBW) is a critical metric for determining appropriate caloric intake, aligning with specific fitness objectives.

Understanding the required calories is key to developing your body, whether the goal is weight gain or loss.

You can optimize dietary and exercise strategies systematically and ensure accuracy in your fitness journey by utilizing TotalShape's IBW Calculator.

Have you managed to control your weight yet? Share your experience in the comments below.