Health & Fitness
· Reviewed by Ali Abbas

Ideal Body Weight Calculator

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What Is Ideal Body Weight?

Ideal body weight (IBW) is a clinical estimate of the weight associated with the lowest health risk for your height and sex. Unlike BMI which only uses height and weight, IBW formulas factor in sex and were originally developed for medication dosing and nutritional assessment.

Why Use This Calculator?

This ideal body weight calculator gives you results from all four major formulas (Devine, Robinson, Miller, Hamwi) plus the clinically validated healthy BMI range (18.5–24.9). It is used by athletes checking performance targets, people starting diets, parents monitoring growth, and healthcare professionals. Results update instantly as you type with automatic imperial/metric conversion.

Understanding the Results

Your result shows the healthy weight range based on BMI plus four different clinical IBW estimates side-by-side. This gives you the full picture instead of a single number. Ideal body weight for men and women differs because formulas account for average differences in muscle mass and body fat percentage.

How to Use This Calculator

  1. 1
    Select Your SexTap Male or Female. The calculator automatically uses the correct formula base values for each.
  2. 2
    Enter Your HeightType your height in cm or feet + inches. The tool auto-converts between units instantly.
  3. 3
    View Instant ResultsSee the healthy BMI range card plus all four formula results (Devine, Robinson, Miller, Hamwi) in kg and lbs. Everything updates live.

Key Features

Common Use Cases

  • Starting a new diet or weight-loss journey and needing a realistic target
  • Athletes and bodybuilders checking if current weight matches performance goals
  • Parents tracking children’s growth against healthy weight charts
  • Preparing for military, insurance, or medical screenings that require IBW
  • Understanding the difference between IBW and BMI before a doctor visit
  • Comparing multiple clinical formulas to see which one best fits your body type

Important Medical Disclaimer: Ideal Body Weight formulas are statistical estimates only and were developed for clinical use (medication dosing, nutritional planning). They do not account for muscle mass, ethnicity, frame size, or individual health conditions. Always consult a qualified healthcare professional before making any changes to diet, exercise, or medication based on these results.

Frequently Asked Questions

How to calculate ideal body weight?
Enter your height and sex into the calculator above. It instantly shows results from Devine, Robinson, Miller, and Hamwi formulas plus the healthy BMI range. No math required.
Is ideal body weight the same as BMI?
No. IBW gives a single target number based on formulas; BMI gives a healthy weight range (18.5–24.9). Both are useful but measure different things.
What is the ideal weight for a 5'4 female?
Using Devine formula a 5'4 female has an IBW of approximately 54.5 kg (120 lbs). Healthy BMI range is 49–66 kg (108–145 lbs).
How accurate is the Devine formula?
Devine (1974) is the most widely used in clinical practice for medication dosing. It works well for average builds but underestimates for muscular people.
Can muscular or athletic people use this ideal body weight calculator?
Yes, but IBW often underestimates for athletes. Consider lean body mass instead. The calculator includes a note for muscular builds.
What IBW formula do doctors use?
Doctors most commonly use the Devine formula (1974) for clinical dosing and nutritional planning.
Why do different formulas give different ideal weights?
Each formula (Devine, Robinson, Miller, Hamwi) was developed from different population data and for slightly different medical purposes.
Can I use this calculator if I am under 5 feet tall?
The four IBW formulas were designed for people over 5 ft (152 cm). Use the BMI range instead for shorter heights.
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