Skip to content
Toolvica

Ideal Weight Calculator

Find your ideal body weight based on height and sex using multiple proven formulas.

US UnitsMetric Units
Try:

Table of Contents

How to Use Our Ideal Weight Calculator

  1. Select your preferred unit system — US (feet/inches, pounds) or Metric (centimeters, kilograms).
  2. Choose your sex (male or female).
  3. Enter your height. In US mode, provide feet and inches. In metric mode, enter centimeters.
  4. Click the Calculate button to see your estimated ideal weight references.
  5. Review the results from all four formulas and the BMI-based reference range side by side.
  6. Use the chart to visually compare the different estimates.

What is Ideal Body Weight?

Ideal body weight (IBW) is an estimated reference weight calculated from height and sex using published formulas. It was originally developed as a practical reference for clinical and medication-dosing applications.

There is no single universally accepted IBW value. Published formulas — such as Hamwi, Devine, Robinson, and Miller — use different constants and can produce noticeably different estimates, and they aren't consistent across heights. This calculator shows multiple estimates side by side so you can see how the formulas compare.

Today, IBW is widely used in sports, fitness, and clinical settings as a quick reference. However, it only factors in height and sex — it does not account for muscle mass, bone density, body composition, or individual health conditions.

IBW should be viewed as a general guideline rather than a strict target. A person can be healthy at a weight above or below their IBW depending on their muscle mass, activity level, and overall health. Focus on balanced nutrition, regular exercise, and sustainable habits rather than chasing a specific number.

Factors That Affect Ideal Weight

Several factors influence what constitutes an ideal weight for an individual:

  • •Height: Taller individuals generally have higher body weights because larger bodies have greater overall mass. IBW formulas scale with height above 5 feet.
  • •Sex: These formulas use different reference values for males and females.
  • •Age: Not an input here; classic IBW formulas are age-blind. Age effects on body composition are better captured by body-fat percentage tools than by weight targets.
  • •Body Frame Size: Not an input here, but worth knowing: larger-framed individuals naturally weigh more at the same height. This tool does not adjust for frame size.
  • •Muscle Mass: Highly muscular individuals may weigh significantly above their IBW while being perfectly healthy. IBW does not distinguish between fat and muscle mass.

Frequently Asked Questions

What is the most accurate ideal weight formula?
No single formula is universally most accurate. The Devine formula is most widely used in medical settings. Robinson and Miller tend to give slightly lower values. The BMI-based reference range provides a broader reference. Using all formulas together gives a more complete picture.
Can I be healthy above my ideal weight?
Yes. IBW does not account for muscle mass, bone density, or body composition. Athletes and muscular individuals often weigh above their IBW while being in excellent health. Focus on body fat percentage and overall fitness rather than weight alone.
Do these formulas work for children?
No. These formulas are designed for adults aged 18 and older. For children and teenagers, BMI-for-age percentile charts from the CDC are the appropriate reference.
How does body frame size affect ideal weight?
Frame size is a general factor in weight ranges — a large-framed person may naturally carry 5–10% more weight than a small-framed person at the same height. This calculator uses height-based formulas and does not adjust for frame size; consider it a starting point.
Should I use IBW or BMI to determine a healthy weight?
Both have limitations. IBW provides a single reference estimate, while BMI gives a range. Neither accounts for muscle vs. fat. For a more complete assessment, consider body fat percentage, waist circumference, and consult a healthcare professional.

References

1. Hamwi GJ. Therapy: Changing dietary concepts. In: Danowski TS, ed. Diabetes Mellitus: Diagnosis and Treatment. Vol 1. New York: American Diabetes Association; 1964:73-78.

2. Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm. 1974;8:650-655.

3. Robinson JD, Lupkiewicz SM, Palenik L, et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm. 1983;40:1016-1019.

4. Miller DR, Carlson JD, Lloyd BJ, Day BJ. Determining ideal body weight (and mass). Am J Hosp Pharm. 1983;40:1622-1625.

5. World Health Organization. Obesity: Preventing and Managing the Global Epidemic. WHO Technical Report Series 894. Geneva: WHO; 2000.

This ideal weight calculator provides estimates based on published medical formulas. It is intended for informational purposes only and should not be used as a substitute for professional medical advice.

Related Calculators

BMI CalculatorBMR CalculatorCalorie CalculatorBody Fat Calculator