Ideal Weight Calculator
Calculate your ideal body weight range using four leading medical formulas — Devine, Robinson, Miller, and Hamwi.
Did this tool work for you?
How to use this calculator
Each formula gives a slightly different result. The range across all four shows the healthy window.
- 1
Enter your height in centimetres.
- 2
Select your biological sex.
- 3
The calculator shows your ideal weight range from four leading medical formulas.
Frequently asked questions
Is there one definitive "ideal weight"?
No. Different formulas give different results, and healthy weight varies by body composition, muscle mass, bone density, and age. The range across formulas is more useful than any single number.
What is the Devine formula?
The Devine formula (1974) was originally developed to estimate drug dosing for ideal body weight. For men: 50 kg + 2.3 kg per inch over 5 feet. For women: 45.5 kg + 2.3 kg per inch over 5 feet.
How does ideal weight differ from healthy BMI weight?
BMI-based healthy weight is a range (18.5–24.9 BMI). Ideal weight formulas give a single target. Ideal weight formulas tend to give lower targets than the upper end of the BMI healthy range.
Should I aim for the ideal weight target?
These formulas are guidelines, not prescriptions. Athletes and muscular individuals often exceed ideal weight while being very healthy. Body fat percentage and fitness are better health indicators than weight alone.
Ideal body weight formulas explained
How to use the ideal weight
Use this ideal weight to your ideal body weight range using four leading medical formulas — devine, robinson, miller, and hamwi. Enter your values above and get your result in seconds. The tool is free, works on all devices, and keeps your data private — nothing is stored or shared.
How the ideal weight works
The ideal weight calculator uses standard formulas used in health tracking, fitness planning, and wellness management. Enter your inputs, and the tool calculates the result instantly in your browser. No server-side processing means your data stays on your device. Results update in real time as you change inputs.
The four main ideal weight formulas
Devine (1974): most widely used in medicine. Robinson (1983): derived from insurance and population data. Miller (1983): based on lean body mass estimates. Hamwi (1964): one of the oldest clinical formulas. All use height as the primary variable, with small adjustments for sex.
Limitations of ideal weight formulas
These formulas were developed decades ago from population studies. They do not account for muscle mass (athletes will appear "overweight"), bone density (larger frames carry more weight healthily), age, or ethnicity. They are screening tools, not diagnostic standards.
A more complete picture of healthy weight
Use ideal weight alongside BMI (18.5–24.9), waist circumference (men <94 cm, women <80 cm), body fat percentage, and physical fitness. No single metric captures health — the combination gives the clearest picture.
Ideal weight: how it works
This free tool provides a quick, evidence-based estimate for wellness planning. It uses standard formulas accepted by health professionals worldwide. Enter your measurements for an instant result — always follow up with a qualified practitioner for personal guidance.
Who uses this tool?
Athletes, fitness enthusiasts, nurses, and anyone monitoring their health use it as a starting point for wellness decisions. Share the output with your doctor or dietitian for a professional interpretation.
Learn more from an authoritative source:
CDCBMI Calculator
Calculate your Body Mass Index and find out which weight category you fall into.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at complete rest.
Calorie Calculator
Calculate your daily calorie needs to lose weight, maintain, or gain weight based on your stats and activity.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method with waist, neck, and hip measurements.
Results are estimates for informational purposes only and do not constitute professional financial, medical, legal, or technical advice. Read full disclaimer →