Ideal & Healthy Body Weight Range Calculator

Calculate your ideal body weight using the Devine, Hamwi, Robinson, and Miller formulas, plus your healthy BMI-based weight range (BMI 18.5-24.9) based on your height and sex.

Mathematical Audit

Ideal Body Weight Formulas & Healthy BMI Range

This calculator combines two approaches to a healthy weight. The healthy weight range comes from the standard BMI range of 18.5-24.9 applied to your height. The ideal body weight estimates come from four formulas commonly used in clinical and fitness settings — Devine, Hamwi, Robinson, and Miller — each of which estimates a baseline weight for someone 5 feet tall and adds a per-inch increment for additional height.

Healthy Weight Range (kg) = 18.5-24.9 × Height (m)²
Devine (kg) = [50 (men) or 45.5 (women)] + 2.3 × (Height in inches − 60)
Hamwi (kg) = {[106 (men) or 100 (women)] + [6 (men) or 5 (women)] × (Height in inches − 60)} × 0.4536
Robinson (kg) = [52 (men) or 49 (women)] + [1.9 (men) or 1.7 (women)] × (Height in inches − 60)
Miller (kg) = [56.2 (men) or 53.1 (women)] + [1.41 (men) or 1.36 (women)] × (Height in inches − 60)

These formulas were originally developed for clinical purposes such as drug dosing and nutrition counseling, not as strict weight-loss targets. They estimate weight from height alone and don't account for muscle mass, body composition, or frame size, so results can vary noticeably between formulas — especially for very tall or very short individuals. Use these figures as a general reference range alongside other health indicators, not as a single target number.

Operational Guide

How to Use the Ideal Body Weight Calculator

1

Choose your unit system

Select metric (centimeters, kilograms) or imperial (feet/inches, pounds) for your results.

2

Select your sex

The Devine, Hamwi, Robinson, and Miller formulas use different baseline constants for men and women.

3

Enter your height

Enter your height in centimeters, or in feet and inches if using imperial units.

4

Click Calculate

See your healthy BMI-based weight range and ideal body weight estimates from all four formulas, plus their average.

Real-World Scenario Example

"A male who is 178 cm (about 5'10") tall wants to find his healthy weight range and ideal body weight."

Inputs

unitSystem:metric
sex:male
heightCm:178

Result

A healthy BMI-based weight range of about 58.6-78.9 kg. Ideal body weight estimates are Devine ≈ 73.2 kg, Hamwi ≈ 75.5 kg, Robinson ≈ 71.1 kg, and Miller ≈ 70.4 kg, averaging about 72.6 kg.

Important Disclaimer

This calculator provides general estimates for informational purposes only and is not a substitute for professional medical advice. Ideal body weight formulas and BMI-based ranges are population-level reference tools and may not reflect what's healthy for any specific individual. Consult a healthcare provider for personalized weight and health guidance.

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