Health & Wellness

Ideal Weight
Calculator

Find your ideal weight using 5 evidence-based formulas. Compare with your current weight and get a personalised healthy weight range by height and gender.

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Ideal Weight

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BMI Range

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Your Status

📏 Height Ruler

170 cm

5'7"

Underweight zone

Healthy weight zone

Overweight zone

Obese zone

Your Details

Height

Age

yrs

Body Frame

Current Weight (optional)

Activity Level

Formula Comparison

📊 Ideal Weight Ranges by Height — All 5 Formulas

How Ideal Weight Is Calculated

An ideal weight calculator uses your height, gender, and body frame to estimate the weight range associated with optimal health outcomes. Unlike BMI alone, dedicated ideal weight formulas were designed by clinicians and researchers for specific purposes — from drug dosing to fitness benchmarks.

The 5 Formulas Used

Hamwi (1964): Male: 48.0 kg + 2.7 kg per inch over 5 ft Female: 45.5 kg + 2.2 kg per inch over 5 ft Adjust: ±10% for small/large frame Devine (1974): Male: 50.0 kg + 2.3 kg per inch over 5 ft Female: 45.5 kg + 2.3 kg per inch over 5 ft Robinson (1983): Male: 52.0 kg + 1.9 kg per inch over 5 ft Female: 49.0 kg + 1.7 kg per inch over 5 ft Miller (1983): Male: 56.2 kg + 1.41 kg per inch over 5 ft Female: 53.1 kg + 1.36 kg per inch over 5 ft BMI Range (WHO): Weight = BMI × Height(m)² → 18.5–24.9 = Healthy

How to Reach Your Ideal Weight

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Set a Realistic Goal

Aim for the midpoint of your ideal range first, not the lower bound. Sustainable weight management beats rapid fluctuations.

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Caloric Balance

A deficit of 500 kcal/day produces ~0.5kg/week of fat loss. Combine diet with exercise for best results and muscle preservation.

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Build Lean Mass

Resistance training increases muscle mass, which raises your metabolic rate. You may gain weight but look leaner — a good outcome.

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Track Weekly Trends

Weigh yourself at the same time each week. Daily fluctuations of 1–3kg are normal due to water, food, and hormones.

Frequently Asked Questions

What is the difference between ideal weight and healthy weight?

Ideal weight (from Hamwi, Devine, Robinson, Miller) was originally designed for clinical dosing purposes and represents a single target number or narrow range. Healthy weight (BMI 18.5–24.9) is a broader range validated by epidemiological research linking it to lower disease risk. In practice, both serve as useful benchmarks — the BMI range is the more widely accepted health standard.

Why do the 5 formulas give different results?

Each formula was developed from different populations and for different purposes. Hamwi (1964) was created for insulin dosing. Devine (1974) was for gentamicin dosing. Robinson and Miller adjusted for broader fitness populations. The BMI range is derived from large population health studies. The differences can be 5–15kg for tall individuals. Using the average of all formulas gives the most balanced estimate.

Should I weigh less if I have a small body frame?

Yes. People with smaller bone frames naturally have less skeletal mass. A ±10% adjustment is standard for small/large frames. Small frame individuals may feel and perform best at the lower end of their formula range. However, bone density, muscle mass, and body composition are more important health indicators than hitting any specific number.

Is ideal weight the same as goal weight?

Not necessarily. Your goal weight should reflect your personal health, performance, and lifestyle objectives — not just a formula output. Some athletes perform best above their "ideal" weight due to high muscle mass. Some people feel their best at the lower end. Use formula results as a starting reference, then adjust based on how you feel, your fitness metrics, and your healthcare provider's guidance.

Related Fitness & Health Calculators

Healthy Weight Calculator

6 formulas for healthy weight range

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Calorie Calculator

Daily calorie needs (TDEE)