Ideal Weight Calculator
Calculate your ideal body weight in kg or lbs — for males & females — using four evidence-based formulas.
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Your Ideal Weight Results
What Is an Ideal Weight Calculator?
An ideal weight calculator is a tool that estimates a healthy body weight range based on your height, gender, and age. Unlike a simple scale reading, it factors in established medical formulas developed by researchers to give you a personalized target weight — whether you prefer results in kg or in lbs.
Our calculator uses four widely recognised formulas simultaneously — Robinson, Miller, Devine, and Hamwi — so you get a realistic range rather than a single rigid number.
How to Use This Ideal Weight Calculator
- Select your unit system: Metric (cm/kg) or Imperial (ft·in/lbs).
- Choose your gender — male or female.
- Enter your age and height.
- Click Calculate Ideal Weight to see your results instantly.
Ideal Weight Calculator in kg and lbs
The calculator displays results in both kg and lbs by default, making it equally useful whether you’re tracking your health using the metric or imperial system. If you prefer to see only ideal weight in kg, select “Metric” mode; choose “Imperial” for results focused on lbs.
Ideal Weight Calculator in cm
When you enter your height in cm, our tool converts it automatically using each formula. This is the standard approach used by healthcare professionals worldwide and reflects height ranges from 140 cm to 220 cm accurately across all four formulas.
Ideal Weight for Males vs. Females
The ideal body weight differs between men and women because of natural differences in bone density, muscle mass, and body composition. Our calculator adjusts results based on gender:
Ideal Weight Calculator — Male
For men, ideal weight formulas generally assign a slightly higher baseline weight per unit of height. For example, at 175 cm, the Devine formula estimates approximately 70.5 kg for males.
Ideal Weight Calculator — Female
For women, the formulas account for lower average muscle mass and bone density, resulting in slightly lower ideal weight targets at the same height. At 165 cm, the Robinson formula estimates approximately 57 kg for females.
The Four Ideal Weight Formulas Explained
| Formula | Male (base at 5 ft) | Female (base at 5 ft) | Per inch added |
|---|---|---|---|
| Robinson (1983) | 52 kg | 49 kg | +1.9 / +1.7 kg |
| Miller (1983) | 56.2 kg | 53.1 kg | +1.41 / +1.36 kg |
| Devine (1974) | 50 kg | 45.5 kg | +2.3 / +2.3 kg |
| Hamwi (1964) | 48 kg | 45.5 kg | +2.7 / +2.2 kg |
The average of all four gives you the most balanced ideal weight estimate. No single formula is universally accepted — using the range is considered best clinical practice.
Why Ideal Body Weight Is Not One-Size-Fits-All
While these formulas are helpful guidelines, they do not account for factors like muscle-to-fat ratio, ethnicity, frame size, or fitness level. Athletes often exceed the “ideal” weight range purely due to lean muscle mass. Always interpret results alongside a BMI check and, when in doubt, consult a healthcare professional.
Frequently Asked Questions
How accurate is an ideal weight calculator?
These calculators provide evidence-based estimates, not exact prescriptions. They are most accurate for average-framed adults aged 18–65. Results should be used as a general target, not a strict medical threshold.
What is the ideal weight for a 170 cm male in kg?
Using the four formulas, the ideal weight range for a 170 cm male is approximately 63–70 kg, with an average around 66 kg.
What is the ideal weight for a 160 cm female in kg?
For a 160 cm female, the ideal weight range is approximately 52–58 kg, with an average around 55 kg.
Is ideal body weight the same as healthy BMI weight?
Not exactly. A healthy BMI (18.5–24.9) gives a broader weight range, while ideal body weight formulas tend to target the lower-middle of that BMI range. Both are useful reference points.
Can I use this calculator for children or teenagers?
These formulas were designed for adults (generally 18+). For children and teenagers, pediatric growth charts and BMI-for-age tools are more appropriate.
Disclaimer: This ideal weight calculator is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider for personalised health guidance.