Free Healthy Weight Calculator Online
Healthy weight range using BMI, Hamwi, Devine and Miller formulas with BMI zone chart
This calculator identifies a healthy weight range for your height using multiple methods — the WHO BMI range (18.5–24.9), and three clinical ideal weight formulas (Hamwi, Devine, and Miller). Showing all methods together helps you understand where there is consensus and where you might set a realistic weight target.
Frequently Asked Questions
About the Healthy Weight Calculator
A "healthy weight" is a range, not a single number. The WHO BMI-based range (18.5–24.9) gives a broad window based on population-level cardiovascular risk data. The clinical formulas (Hamwi, Devine, Miller) were developed for specific medical purposes like drug dosing and nutritional planning, and they converge on a narrower midpoint within the BMI range.
None of these approaches are perfect. They don't account for muscle mass distribution, age-related changes in body composition, or ethnicity-based differences in risk thresholds. Some research suggests Asian populations have elevated metabolic risk at BMI values as low as 23, while musculoskeletal athletes may be healthiest at BMI values above 25.
The most practically useful application of this calculator is to establish a target weight range for gradual, sustainable progress. A 1–2 kg monthly change is generally achievable and clinically safe. Dramatic, rapid weight changes — in either direction — carry health risks independent of the goal.
When Should You Use This?
The Healthy Weight Calculator is ideally suited for fitness enthusiasts, healthcare professionals, and individuals monitoring their health who need to perform quick, accurate calculations related to general calculations. Use this tool when you need to verify figures, compare different scenarios, or get a precise answer without manual computation errors.
What Does The Result Mean?
The calculated metrics provide a scientifically validated baseline for your health or fitness goals. While these numbers are highly accurate based on standard medical formulas, they should serve as a guide rather than a replacement for professional medical advice.
Example Calculation
Healthy weight range for a 5'6" (168 cm) woman
📥 Inputs
- Sex: Female
- Height: 168 cm (5 ft 6 in)
🔢 Calculation Steps
- 1WHO BMI range (18.5–24.9): min = 18.5×(1.68)² = 52.2 kg | max = 24.9×(1.68)² = 70.3 kg
- 2Hamwi formula (female): 45.4 + 2.27 × (inches over 5 ft) = 45.4 + 2.27 × 6 = 59.0 kg
- 3Devine formula (female): 45.5 + 2.3 × (inches over 5 ft) = 45.5 + 13.8 = 59.3 kg
- 4Miller formula (female): 53.1 + 1.36 × (inches over 5 ft) = 53.1 + 8.16 = 61.3 kg
Limitations of this Calculator
- Formulas are based on population averages and may not perfectly reflect individuals with extreme muscle mass or atypical body compositions.
- Does not replace a physical examination or clinical diagnosis by a certified medical professional.
- Calculations cannot account for underlying metabolic conditions or genetic factors that influence individual health metrics.
How to Use the Healthy Weight Calculator
- 1Enter your values into the Healthy Weight Calculator input fields above.
- 2Review the input labels to ensure you are using the correct units.
- 3Click the "Calculate" button to get your instant result.
- 4Use the step-by-step breakdown to understand how the result was calculated.
- 5Export or copy your result to use in reports or share with others.
Tips & Best Practices
- Double-check your input units before calculating — using the wrong unit is the most common source of errors.
- Bookmark this Healthy Weight Calculator for quick access next time you need it.
- Use the share button to send your results to a colleague or save them for later reference.
Related Calculators
View all Health & Fitness Calculators →
⚠️ Health Disclaimer: Results provided by this calculator are for informational and educational purposes only. They do not constitute medical advice. Always consult a qualified healthcare professional, doctor, or registered dietitian before making any health, fitness, or dietary decisions.