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Ideal Weight Calculator

Find your ideal body weight range using multiple medical formulas.

Ideal weight formulas are general guides, not medical diagnoses. Individual healthy weights vary. Consult a healthcare professional for personalised weight and health advice.

BMI Healthy Range

How It Works

Enter your height and gender. The calculator shows ideal weight according to four widely used formulas: Hamwi, Devine, Robinson, and Miller, plus the BMI-based healthy weight range.

**Ideal Weight Calculator — Evidence-Based Weight Targets**

There is no single universally agreed "ideal" body weight. Different medical formulas, developed for different clinical contexts, give slightly different results. Our Ideal Weight Calculator shows you the range from multiple formulas so you can understand what several evidence-based perspectives suggest.

**Four Ideal Body Weight Formulas**

**1. Hamwi Formula (1964)**
Men: 48 kg + 2.7 kg per inch over 5 feet
Women: 45.5 kg + 2.2 kg per inch over 5 feet

**2. Devine Formula (1974)**
Men: 50 kg + 2.3 kg per inch over 5 feet
Women: 45.5 kg + 2.3 kg per inch over 5 feet
(Originally developed for drug dosing calculations)

**3. Robinson Formula (1983)**
Men: 52 kg + 1.9 kg per inch over 5 feet
Women: 49 kg + 1.7 kg per inch over 5 feet

**4. Miller Formula (1983)**
Men: 56.2 kg + 1.41 kg per inch over 5 feet
Women: 53.1 kg + 1.36 kg per inch over 5 feet

**5. BMI-Based Healthy Weight Range**
Minimum healthy weight = 18.5 × height(m)²
Maximum healthy weight = 24.9 × height(m)²

This range is the widest and accounts for individual variation in body composition.

**Limitations of Ideal Weight Formulas**

All of these formulas were developed primarily from studies of white populations and may not be accurate for other ethnicities. They also don't account for:
- Body composition (muscle vs. fat)
- Age-related changes in body composition
- Frame size (small, medium, large frame)
- Individual health context

**A More Holistic Approach**

Rather than chasing a specific number, focus on:
- Metabolic health markers (blood pressure, blood sugar, cholesterol)
- Physical fitness and functional capacity
- How you feel and your energy levels
- Waist circumference (key indicator of visceral fat risk)

Frequently Asked Questions

No single formula is definitively best. The BMI-based healthy weight range (18.5–24.9) is the most widely accepted. The Devine formula is commonly used in clinical drug dosing.
No. Frame size matters. People with large bone structure naturally weigh more. These formulas give averages; your personal ideal weight may differ.
Weight is one indicator of health, not the only one. If your blood pressure, blood sugar, and cholesterol are normal and you have good fitness, you may be healthier than the scale suggests.
Muscle weighs more than fat by volume. A muscular person may weigh above the "ideal" range while having excellent health. Body composition matters more than total weight.
Yes — this is sometimes called "metabolically healthy obesity." However, research shows the metabolic health of overweight individuals often deteriorates over time, so weight management remains important.