Free Ideal Weight Calculator
Discover your healthy weight range and ideal body weight based on medically recognised formulas. Take a proactive step towards understanding your health metrics.
Calculate Your Healthy Weight Range
Enter your details below. The calculator uses both the standard healthy BMI range and the Devine formula to give you a comprehensive target weight estimate.
Ideal Weight Estimator
Enter your details to get personalised weight metrics
Health & Wellness Tips
Beyond the numbers on the scale
Understanding Weight Metrics
Knowing how ideal weight is calculated helps you interpret your results accurately and set realistic health goals.
The BMI Method
Body Mass Index (BMI) is calculated by dividing your weight in kilograms by your height in metres squared. The World Health Organization (WHO) defines a ‘healthy’ BMI as falling between 18.5 and 24.9.
The Devine Formula
Developed in 1974 for medical dosing, this formula estimates ideal weight based on height and gender. It adds a base weight (50kg for men, 45.5kg for women) plus 2.3kg for every inch over 5 feet.
Consider Age and Frame Size
As we age, muscle mass naturally decreases and bone density changes. Additionally, individuals with a larger skeletal frame may naturally weigh more than the formulas suggest while remaining perfectly healthy.
Look at the Bigger Picture
Weight is just one data point. Blood pressure, cholesterol levels, blood sugar, cardiovascular fitness, and mental well-being are equally, if not more, important indicators of overall health.
Standard BMI Categories (WHO)
A general summary of how the World Health Organization classifies Body Mass Index for adults.
| BMI Range | Classification | Health Consideration |
|---|---|---|
| Below 18.5 | Underweight | May indicate malnutrition, eating disorders, or underlying health issues. |
| 18.5 – 24.9 | Normal (Healthy) Weight | Associated with the lowest risk of weight-related health problems. |
| 25.0 – 29.9 | Overweight | Increased risk of cardiovascular disease, type 2 diabetes, and hypertension. |
| 30.0 – 34.9 | Obesity Class I | Moderate risk of weight-related health complications. |
| 35.0 – 39.9 | Obesity Class II | Severe risk of weight-related health complications. |
| 40.0 and above | Obesity Class III | Very severe risk; medical intervention is often recommended. |
Ideal Weight FAQ
Answers to the most frequently asked questions about body weight, BMI, and health metrics.
Ideal weight is typically estimated using formulas like the Devine formula or by calculating a healthy Body Mass Index (BMI) range (18.5 to 24.9). For example, a person who is 170cm (5’7″) tall has a healthy BMI weight range of approximately 53.5kg to 72kg.
Yes, significantly. Formulas like BMI do not distinguish between muscle and fat. Athletes or individuals with high muscle mass may be classified as ‘overweight’ by BMI standards, even though their body fat percentage is healthy. In such cases, body composition analysis is a better metric.
The Devine formula is a widely used medical equation to estimate ideal body weight. For men, it is 50kg + 2.3kg for every inch over 5 feet. For women, it is 45.5kg + 2.3kg for every inch over 5 feet.
No. Weight calculators provide a general estimate, but overall health depends on many factors, including diet, physical activity, blood pressure, cholesterol, and genetics. Always consult a healthcare professional for personalised medical advice.