Ideal Weight Calculator
Find your ideal body weight using four trusted medical formulas based on your height, gender, and frame size.
Calculate Your Ideal Body Weight
How to Use the Ideal Weight Calculator
- Select Your Gender: Choose male or female to apply the correct formula coefficients.
- Enter Your Height: Input your height in centimetres or feet and inches.
- Choose Height Unit: Toggle between centimetres and feet/inches based on your preference.
- Select Frame Size: Choose small, medium, or large body frame for adjusted ranges.
- Click Calculate: Press the Calculate button to see your ideal weight results from four formulas.
- Review Results: Compare results across Devine, Robinson, Miller, and Hamwi formulas and the healthy BMI range.
Key Features of This Ideal Weight Calculator
Four Medical Formulas
Get results from Devine, Robinson, Miller, and Hamwi formulas for a comprehensive comparison.
Dual Height Units
Enter your height in centimetres or feet and inches with instant conversion.
Frame Size Adjustment
Adjust results based on your body frame — small, medium, or large — for more accurate estimates.
BMI Weight Range
See the healthy weight range for your height based on a BMI of 18.5 to 24.9.
100% Private
All calculations happen in your browser. No data is sent to any server.
Mobile Friendly
Works perfectly on phones, tablets, and desktops with a responsive layout.
Ideal Weight Formulas Explained
This calculator uses four widely referenced formulas developed by medical researchers. Each formula estimates ideal body weight (IBW) primarily from height in inches over 5 feet (60 inches).
| Formula | Male (kg) | Female (kg) |
|---|---|---|
| Devine (1974) | 50.0 + 2.3 × (inches over 60) | 45.5 + 2.3 × (inches over 60) |
| Robinson (1983) | 52.0 + 1.9 × (inches over 60) | 49.0 + 1.7 × (inches over 60) |
| Miller (1983) | 56.2 + 1.41 × (inches over 60) | 53.1 + 1.36 × (inches over 60) |
| Hamwi (1964) | 48.0 + 2.7 × (inches over 60) | 45.5 + 2.2 × (inches over 60) |
Frame adjustment: Small frame subtracts 10%, and large frame adds 10% to each result. The healthy BMI range is calculated as weight (kg) = BMI × height (m)².
Practical Examples
Example 1: Indian Male, 170 cm, Medium Frame
Height: 170 cm = 66.93 inches → 6.93 inches over 60
Devine: 50 + 2.3 × 6.93 = 65.9 kg | Robinson: 52 + 1.9 × 6.93 = 65.2 kg
Miller: 56.2 + 1.41 × 6.93 = 65.97 kg | Hamwi: 48 + 2.7 × 6.93 = 66.7 kg
Average: ~66.0 kg | BMI range: 53.5–78.3 kg
Example 2: Indian Female, 5'4", Small Frame
Height: 5'4" = 64 inches → 4 inches over 60
Devine: 45.5 + 2.3 × 4 = 54.7 kg → Small frame: 49.2 kg
Robinson: 49 + 1.7 × 4 = 55.8 kg → Small frame: 50.2 kg
Average (frame-adjusted): ~50.5 kg
Example 3: International Male, 6'0", Large Frame
Height: 6'0" = 72 inches → 12 inches over 60
Devine: 50 + 2.3 × 12 = 77.6 kg → Large frame: 85.4 kg
Robinson: 52 + 1.9 × 12 = 74.8 kg → Large frame: 82.3 kg
Average (frame-adjusted): ~82.4 kg
What Is Ideal Body Weight?
Ideal body weight (IBW) is a medical estimate of how much a person should weigh based on their height and gender. Originally developed for pharmaceutical dosing, IBW formulas are now widely used in clinical practice, fitness planning, and general health awareness.
It is important to understand that ideal weight is a guideline, not an absolute target. Factors such as muscle mass, bone density, age, ethnicity, and body composition all influence what a healthy weight means for an individual. Athletes, for example, may weigh significantly more than their IBW due to muscle mass, and that is perfectly healthy.
Always consult a qualified healthcare provider before making significant changes to your diet or exercise routine based on these calculations.
📖 Learn more about ideal weight formulas, their origins, and how to interpret your results.
Read the Complete Guide →Frequently Asked Questions
Yes, this ideal weight calculator is completely free with no registration, login, or hidden charges required.
It uses four medically recognised formulas: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964) to give you a comprehensive range.
These formulas provide general guidelines based on height and gender. They do not account for muscle mass, bone density, or body composition. Consult a healthcare professional for personalised advice.
The Devine formula calculates ideal weight as 50 kg + 2.3 kg for each inch over 5 feet for males, and 45.5 kg + 2.3 kg for each inch over 5 feet for females.
Yes, body frame size adjusts the ideal weight range. Small frames reduce the estimate by about 10%, and large frames increase it by about 10%.
Yes, you can enter your height in centimetres or feet and inches. The calculator converts automatically for the formulas.
No, ideal body weight uses height-based formulas, while BMI is a ratio of weight to height squared. This calculator shows both for comparison.
A healthy BMI range is typically 18.5 to 24.9 kg/m². This calculator shows the corresponding weight range for your height.
No, ideal weight formulas are general estimates. Factors like age, muscle mass, ethnicity, and overall health should be considered. Always consult a doctor for personalised guidance.
No, all calculations happen in your browser. No data is stored, transmitted, or shared with any server.
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