How to Find Ideal Body Weight for Height

Learn how ideal weight is calculated using the Robinson, Devine, Hamwi, and Miller formulas. See what each formula means and which applies to your health goals.

Reviewed & verified by Ismail Nemat

Introduction

People are often curious about their optimum body weight and whether their body weight is within a healthy range. There is no fixed standard of the perfect weight for all people, but there are medical formulas that are able to give a useful estimate for a person based on his/her height and gender. They are called Ideal Body Weight (IBW) estimates. An Ideal Weight Calculator takes into account the formulas set by doctors and recommends a range of weights that are healthy. The calculator does not use only one formula, but may compare the results of several formulas, such as the Robinson formula, Miller formula, Devine formula, and the Hamwi formula. Assumptions vary slightly between each formula, so the results could differ.

Ideal Body Weight (IBW)?

Ideal Body Weight (IBW) is an estimated body weight that, for some people, might be healthy or appropriate depending on their height and, for some formulas, gender. IBW formulas were originally developed for medical and clinical purposes, such as:

● Estimating medication dosages.

● Assessing nutritional needs.

● Giving ranges of weights for reference.

● Providing overall health assessments.

Ideal weights are used today as a general guide to health. They can also help people determine if their current weight is within a desirable range and help them establish a weight management target.

Ideal weight scale card on glass scale

The Robinson Formula

The Robinson Formula was developed to modify the previous ideal weight formulas in 1983. It is widely used as it tends to underestimate some of the other methods.

For Men

IBW = 52 kg + 1.9 kg for each inch over 5 feet. For Women
IBW = 49 kg + 1.7 kg for each inch over 5 feet

The Miller Formula

Another popular formula for determining ideal body weight is known as the Miller Formula. It offers an alternative calculation that can give slightly different results than the Robinson formula.

IBW = 56.2 kg + 1.41 kg for each inch over 5 feet. For Women
IBW = 53.1 kg + 1.36 kg for each inch over 5 feet

The Devine Formula

The Devine Formula is one of the most popular ideal body weight formulas. It was first developed in 1974 to help determine dosages of medications.

IBW = 50 kg + 2.3 kg for each inch over 5 feet. For Women
IBW = 45.5 kg + 2.3 kg for each inch over 5 feet

The Hamwi Formula

Another traditional way to calculate the ideal body weight is the Hamwi Formula, and it's a common guideline in health and nutrition environments.

IBW = 48 kg + 2.7 kg for each inch over 5 feet. For Women
IBW = 45.5 kg + 2.2 kg for each inch over 5 feet

Why there are different formulas, and what makes them different. Different assumptions and population data have been used when creating each ideal weight formula. Therefore, there is some fluctuation in the estimates.

The ideal weight results mean

An Ideal Weight Calculator will give you estimated weight ranges to do this.

If your weight falls into the range you were estimated, you should consider the following options: If your actual weight is within the range indicated by the weight formulas, this might indicate that your weight is within the normal ranges of weight for your height.

If Your Weight Is Above the Estimated Range

If you have a BMI higher than the range, this doesn't necessarily indicate that you are unhealthy. Body weight can be high without the body being unhealthy due to factors like muscle mass, bone density, and body composition. If weight is below the Estimated Range, you should gain weight. If weight is below the Estimated Range, try to gain weight.

Discuss the overall limitations of Ideal Weight Formulas.

As appealing as ideal weight formulas would be, there are several important limitations to keep in mind:

They don't measure fat percent.

They do not take into account muscle mass. People with high muscle mass may weigh within the range and be healthy, or outside of the range and be healthy.

They don't take into account the density of bones or frame size of the body.

May not completely represent age-related alterations in body composition. They should not be used as a substitute for medical advice or full health evaluations. The ideal weight estimates should therefore only be used in conjunction with other health measurements.

Having realistic, healthy weight goals is an important first step.

The purpose of using an Ideal Weight Calculator does not necessarily need to be to reach a specific number, per se. Rather, prioritize a weight that will be beneficial to your health, energy level, fitness, and overall health. Use Estimate as a Guideline to generate a guess. Use Estimate as a Guideline to make a guess. Use the range of ideal weight as a guide, rather than a rule. The healthiest weight can differ based on your body type and way of life.

Improve your body composition.

If you have a higher amount of lean muscle mass, you will be heavier than the ideal weight range and may still be within a healthy and fit range.

Set Gradual Goals

If you need to lose weight or gain weight, make gradual and sustainable changes rather than quick or dramatic changes.

Consider Overall Health

A healthy weight management plan should help to incorporate the following:

● Balanced nutrition

● Regular physical activity

● Adequate sleep

● Stress management

● Health checks as required

Apple with tape measure next to calculator

Tips for maintaining and achieving a healthy weight

Follow a nutritious eating plan that includes fruits, vegetables, whole grains, lean protein and healthy fats.

● Regular exercise, both cardio and strength exercises.

● Track a variety of health measures, not just weight.

● Keep drinking plenty of water and follow a regular diet.

Don't engage in crash diets or in extreme methods of weight loss that are not easy to maintain. Seek advice from a health care provider or registered dietitian for individual guidance, if necessary.

Final Thoughts

An Ideal Weight Calculator is a useful calculator for determining the range of healthy body weight based on the listed medical formulas by Robinson, Miller, Devine, and Hamwi. When you look at the output of several formulas, you will learn more about your potential ideal weight range and can use it as a guideline to help you establish realistic health and fitness goals. Ideal weight estimates should be used as a guide and not a target, however. An individual may say that they have a healthy weight, depending on a number of factors, including their muscle mass, total body fat percentage, bone structure, age, activity level, and overall health. At Calculate Hub, our Ideal Weight Estimator is intended to give you useful estimates that will help you to make better health and fitness plans. Take the results as a first step and, along with healthy lifestyle habits and professional advice, use the results to help reach long-term and sustainable wellness.

Tape measure curled around green calculator

How the Ideal Weight Calculator Works

The ideal weight calculator provides evidence-based target weight ranges using four established medical formulas — Devine, Robinson, Miller, and Hamwi. Each formula was developed for different clinical populations, so showing all four gives a realistic range rather than a single number that may not apply to your body type.

Formula or calculation logic

Devine formula (men): IBW = 50 kg + 2.3 kg per inch over 5 ft. Women: 45.5 kg + 2.3 kg/inch. Robinson, Miller, and Hamwi use similar linear formulas with different baselines.

Step-by-Step Practical Example

Follow a realistic set of inputs from start to finish to understand what the result means.

Example 1: Ideal weight for an average-height male.

  1. 1.Enter the inputs: Male, height 5'10" (178 cm).
  2. 2.Apply the logic: Apply the formula above to the listed inputs for "Ideal weight for an average-height male".
  3. 3.Read the result: Devine: 165.5 lbs. Robinson: 162 lbs. Hamwi: 166 lbs. BMI 18.5-24.9 range: 129-167 lbs. Reasonable target range: 150-170 lbs.

Example 2: Ideal weight for an average-height female.

  1. 1.Enter the inputs: Female, height 5'5" (165 cm).
  2. 2.Substitute the inputs: Place the listed inputs into the formula above for "Ideal weight for an average-height female".
  3. 3.Read the result: Devine: 122.5 lbs. Robinson: 119 lbs. Miller: 121 lbs. BMI range: 111-144 lbs. Reasonable target range: 115-140 lbs.

Example 3: Tall person — formulas can underestimate.

  1. 1.Enter the inputs: Male, height 6'4" (193 cm).
  2. 2.Verify the calculation: Work through the formula above for "Tall person — formulas can underestimate", then compare the displayed result.
  3. 3.Read the result: Devine: 192.5 lbs. BMI healthy range: 149-194 lbs. For muscular athletes, healthy weight can extend to 210 lbs or higher.

Key Terms & Variable Definitions

  • Height

    Body height used to estimate weight ranges.

  • Sex

    The selected formula or reference range for the estimate.

  • Weight range

    A range rather than a single target, based on the selected method.

Frequently Asked Questions

What is ideal body weight?

Ideal body weight (IBW) is a target weight associated with good health outcomes for a given height. Multiple formulas exist — Devine, Robinson, Miller, and Hamwi are the most used.

Is there one perfect ideal weight formula?

No single formula works for everyone. IBW formulas don't account for muscle mass, frame size, or ethnicity. Use them as a general reference, not a strict target.

How does height affect ideal weight?

Generally, every inch of height above a base height adds 2–5 lbs to the ideal weight estimate, depending on the formula used.

Can I weigh more than my ideal weight and still be healthy?

Yes. Someone with significant muscle mass may exceed ideal weight formulas and still be very healthy. Focus on body composition, energy levels, and medical markers.

Why are men and women's ideal weights different?

Men typically have more lean mass per inch of height. The formulas adjust the baseline weight by sex.

Sources for Ideal Weight Calculator

Official reference links for this guide article:

Principles at Calculate Hub

Our tools are also regularly reviewed and enhanced to ensure quality and usability. The following are some features that set Calculate Hub apart. There are tools available on many calculator websites. Not all platforms, however, are user experience-focused. The simplicity and usefulness of Calculate Hub are due to its design.

Key Features

Calculators will be available to use for free.● Fast calculation results● Mobile-friendly design● Easy navigation● Clear user interface● Helpful educational content● Growing calculator library● Formulas and calculations that are reliable.Calculators Provide AnswersFor this reason, we also provide guides and education. These resources explain:How Formulas WorkHow calculations are undertaken. How calculations are carried out. Use of particular calculators, common calculation mistakes, Real-life examples, and applications. Our educational products combine calculators with educational content to bring the user confidence and knowledge. This also enables users to know why they are seeing numbers. Our tools have a wide variety of uses, and Calculate Hub grows as a trusted online resource.Our Focus On QualityTrust is a key factor in relationships with online tools. That's why we're paying special attention to accuracy, transparency, and user experience. All our content and calculators are designed to give you useful information and are of high quality.We are committed to continual improvement of our platform through updates, new calculator tools, and educational resources. This pledge will make our guests' visit more enjoyable.Who Can Benefit from a Calculate Hub?Our calculators are designed for a diverse audience.Our MissionWe are here to simplify, make calculations easy, and ensure the accuracy of calculations. We feel that all people should have access to tools that will help them be knowledgeable about numbers and make informed decisions. Calculate Hub is designed to help with all of your budgeting, health planning, math problem-solving, or financial exploration needs. We want to be a trusted website for online calculators and learning tools for people worldwide.Frequently Asked QuestionsQ1) Are there any Restrictions on the Use of Calculators?No. All of the calculators offered by Calculate Hub are 100% free to view and use.Q2) Is it necessary to have an account?Users do not need to sign up or open an account to use the calculators.Q3) Do the answers from the calculator make sense?Our calculators' formulas and methods are proven and reliable, providing accurate estimates and results.Q4) Is Calculate Hub mobile-friendly?Yes. The site is easily accessible from smartphones, tablets, and desktop computers as well.Q5) Who can use these calculators?Our tools are available for everyone, from students to professionals, business owners, teachers, and more.Start Your Journey to Calculate Confidence!Calculate Hub is a wonderful and reliable platform that can offer monetary insights, health estimates, mathematical answers, and even everyday calculations. Explore our categories of calculators, grab some guides, and simplify complex calculations with accurate, quick, and easy-to-use calculators.

© 2026 Calculate Hub. All rights reserved.