How the Ideal Weight Calculator Works

    Understand the different formulas for calculating ideal weight (Devine, Robinson, IMC) and why it's a range, not an exact number.

    Written by Felipe Spirola (Health Tech Specialist)Reviewed by FitBalanceCalc Editorial BoardUpdated 2026-06-20

    Ideal Weight Calculator

    Find out the healthiest weight range for your profile

    📚 📚 Understand your ideal weight

    • • • Ideal weight varies with body composition and genetics
    • • • Muscles weigh more than fat - use other metrics too
    • • • Focus on overall health, not just the number on the scale
    • • • Consult a professional for a personalized evaluation
    Learn how the ideal weight calculator works
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    How to Find Your Ideal Weight?

    Understand the different mathematical methods and formulas that define ideal body weight for men and women.

    Read article

    Quick Answers (Zero-Click FAQ)

    What is my ideal weight based on height and age?

    Your ideal weight is estimated using equations like Devine or Robinson, aiming for a healthy BMI of 18.5 to 24.9. For example, the ideal weight range for a person 5'9" (175 cm) tall is between 125 lbs (56.6 kg) and 169 lbs (76.6 kg).

    Is the ideal weight formula the same for men and women?

    No. Men have higher muscle mass and bone density, so ideal weight formulas (like Devine) add a baseline weight for height that is higher for men than for women (e.g., 50 kg baseline for men vs 45.5 kg for women).

    More Than a Number on the Scale

    The concept of 'ideal weight' is complex and varies greatly from person to person. Instead of a single number, it's more accurate to think of a healthy weight range. Our calculator uses recognized formulas to provide this range, helping you set a realistic goal.

    How the Calculation is Done

    Devine Formula (1974)

    For Men

    50 kg + 2.3 kg per inch over 5 feet

    For Women

    45.5 kg + 2.3 kg per inch over 5 feet

    One of the most classic and widely used formulas.

    Robinson Formula (1983)

    For Men

    52 kg + 1.9 kg per inch over 5 feet

    For Women

    49 kg + 1.7 kg per inch over 5 feet

    An adjustment to the Devine formula, also very popular.

    Calculation Based on Ideal BMI

    Min Weight = 18.5 × (Height in m)²

    Max Weight = 24.9 × (Height in m)²

    This is the most modern approach, providing a range based on the healthy BMI recommended by the WHO.

    Factors that Influence Ideal Weight

    Body Composition

    Muscle is denser than fat. Athletes may have a higher ideal weight.

    Tip: Use a body fat calculator.

    Body Structure

    Bone density and frame size (small, medium, large) influence weight.

    Tip: A larger frame may mean a higher ideal weight.

    Age

    Body composition changes with age, which may alter the ideal weight.

    Tip: Focus on functionality and health, not just weight.

    Interpreting the Results

    Below Range

    May indicate underweight

    Attention

    Within Range

    Healthy weight

    Ideal

    Above Range

    May indicate overweight

    Attention

    Limitations and Considerations

    Important notes:

    • •Ideal weight formulas do not apply to children or adolescents.
    • •They are less accurate for very tall or very short individuals.
    • •They do not replace a professional medical evaluation.

    Frequently Asked Questions

    Get your questions about BMI, calories, and health answered

    💡 Still have questions?

    Remember: FitBalanceCalc is an educational tool. for personalized guidance on diet, exercise, or specific medical issues, always seek qualified health professionals such as nutritionists, physical educators, and doctors.

    Sources & Scientific References

    1. [1]Robinson JD, Lupkiewicz SM, Palenik L, et al. Determination of ideal body weight for drug dosage calculations. American Journal of Health-System Pharmacy, 40(6):1016–1019, 1983.
    2. [2]Devine BJ. Gentamicin therapy. Drug Intelligence and Clinical Pharmacy, 8:650–655, 1974.
    3. [3]World Health Organization (WHO). Physical status: the use and interpretation of anthropometry. WHO Technical Report Series 854. Geneva: WHO, 1995.

    ⚠ Legal Disclaimer

    FitBalanceCalc provides calculation tools based on international public health guidelines. This data is strictly informational and educational in nature and does not replace medical diagnosis, medical guidance, or the supervision of nutritionists and physical education professionals.