Ideal Weight Calculator
Ideal Weight Calculator: Healthy Weight Range & BMI Guide
An Ideal Weight Calculator is a useful health and fitness tool that helps estimate the healthiest weight range for a person based on height and gender. This free ideal weight calculator uses four well-known formulas, Robinson, Miller, Devine and Hamwi, and shows a lower limit, an upper limit and an average, instead of just one number. It also includes a BMI analysis and the healthy BMI weight range for your height. It supports centimeters, feet, inches, kilograms and pounds, so it is easy to use worldwide.
Quick answer: for a man who is 170 cm (5 ft 7 in) tall, the four formulas give about 65.2 to 66.7 kg, an average of 66.0 kg, while the healthy BMI range for that height is roughly 53.5 to 72.0 kg. Enter your own height and gender above for your personal numbers.
What Is Ideal Weight?
Ideal weight is the body weight range considered healthiest for a person based on factors like height, gender and body structure. It is not a perfect number but a range linked to lower health risks and better physical balance. Staying in a healthy weight range may help lower the chance of obesity, high blood pressure, type 2 diabetes, heart disease, joint problems, sleep apnea and fatigue. Ideal weight estimates are used in clinics, fitness centers, diet planning, sports training and medical assessments.
Formulas Used in This Ideal Weight Calculator
The four formulas all start from a base weight for a height of 5 feet (60 inches) and add a set amount for every extra inch. Because they come from different studies, their results differ slightly, which is why the calculator shows all of them.
| Formula | Men | Women |
|---|---|---|
| Robinson (1983) | 52 kg + 1.9 kg per inch over 5 ft | 49 kg + 1.7 kg per inch over 5 ft |
| Miller (1983) | 56.2 kg + 1.41 kg per inch over 5 ft | 53.1 kg + 1.36 kg per inch over 5 ft |
| Devine (1974) | 50 kg + 2.3 kg per inch over 5 ft | 45.5 kg + 2.3 kg per inch over 5 ft |
| Hamwi (1964) | 48 kg + 2.7 kg per inch over 5 ft | 45.5 kg + 2.2 kg per inch over 5 ft |
For the same 170 cm man, Robinson gives 65.2 kg, Miller 66.0 kg, Devine 65.9 kg and Hamwi 66.7 kg. The calculator shows their average and the range between the lowest and highest.
BMI and Ideal Weight
BMI, or Body Mass Index, compares weight with height. When you enter your current weight, the calculator shows your BMI and category: underweight below 18.5, normal weight 18.5 to 24.9, overweight 25 to 29.9 and obese 30 or above. The healthy BMI range gives a wider, more flexible target than the formulas, so many healthy people fall outside the formula range. For a full BMI breakdown, use the BMI calculator, and the overweight calculator shows how far a weight is above the healthy range.
Why a Healthy Weight Matters
Your weight affects nearly every part of your health. Both underweight and overweight can influence energy, immunity, hormones and fitness. A healthy weight supports better metabolism, endurance, heart health, sleep, mobility and lower stress on joints. Weight is only one measure, so check it alongside body composition with the body fat calculator, and plan your energy needs with the calorie calculator or BMR calculator.
Limits of Ideal Weight Formulas
The formulas use only height and gender. They do not account for muscle mass, frame size, age or genetics, and they were developed for adults. They are estimates, not targets, and staying anywhere in your healthy BMI range is normal. If you are worried about your weight, or find yourself focusing too much on a number, a doctor or registered dietitian can give personal advice.
Who Can Use This Calculator?
Men and women checking a healthy body weight, people tracking fitness goals, gym users and athletes, fitness trainers and coaches, diet and nutrition planners, adults monitoring BMI and health, and healthcare professionals can all use it. Children and teenagers need BMI-for-age charts instead.
How to Use This Ideal Weight Calculator
Enter your height
Choose cm, in, or ft + in from the dropdown.
Enter your age and gender
Choose M or F. The formulas differ for men and women.
Add your current weight (optional)
Choose kg or lb to see your BMI. Results are shown in the same unit.
Click "Calculate Ideal Weight"
See your average ideal weight, the four formula results, the healthy range, your BMI and a recommendation.