Ideal Weight Calculator
Weight Results
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Ideal Weight Calculator: Find Your Healthy Weight Range
Introduction
Finding your ideal weight isn't about achieving a perfect number, but rather discovering a healthy range that supports your overall well-being. Our Ideal Weight Calculator uses multiple scientific formulas to give you a comprehensive view of what weight range might be healthiest for your body.
This tool combines five different formulas — Robinson, Miller, Devine, Hamwi, and Peterson — developed between 1964 and 2016. It also provides the healthy weight range based on Body Mass Index (BMI) standards, giving you a complete picture of your healthy weight possibilities.
How to Use This Calculator
Step 1: Select Your Units
Choose between Metric (cm, kg) or Imperial (ft/in, lbs) measurement systems.
Step 2: Enter Personal Information
- Age: Enter your age (2-80 years). Age affects the Peterson formula.
- Gender: Select Male or Female — formulas differ for each.
- Height: Enter your height in cm (Metric) or feet/inches (Imperial).
Step 3: Calculate and Review
Click Calculate to see your ideal weight from all five formulas and the healthy BMI range.
Pro Tip: Consider the Range
When you get different results from different formulas, don't be concerned. Consider the range of results rather than focusing on any single number. The average of all formulas gives you a balanced estimate.
The 5 Formulas Explained
1. Robinson Formula (1983)
Men: 52 kg + 1.9 kg per inch over 5 feet
Women: 49 kg + 1.7 kg per inch over 5 feet
Men: 52 + 1.9 × (height in inches - 60)
Women: 49 + 1.7 × (height in inches - 60)
Developed by Dr. Robinson in 1983, this formula is based on statistical analysis of healthy weight ranges and is widely used in medical settings.
2. Miller Formula (1983)
Men: 56.2 kg + 1.41 kg per inch over 5 feet
Women: 53.1 kg + 1.36 kg per inch over 5 feet
Men: 56.2 + 1.41 × (height in inches - 60)
Women: 53.1 + 1.36 × (height in inches - 60)
Also developed in 1983, the Miller formula tends to give slightly higher estimates than Robinson's formula, particularly for taller individuals.
3. Devine Formula (1974)
Men: 50 kg + 2.3 kg per inch over 5 feet
Women: 45.5 kg + 2.3 kg per inch over 5 feet
Men: 50 + 2.3 × (height in inches - 60)
Women: 45.5 + 2.3 × (height in inches - 60)
One of the oldest formulas still in use, the Devine formula was originally developed for medical dosage calculations.
4. Hamwi Formula (1964)
Men: 48 kg + 2.7 kg per inch over 5 feet
Women: 45.5 kg + 2.2 kg per inch over 5 feet
Men: 48 + 2.7 × (height in inches - 60)
Women: 45.5 + 2.2 × (height in inches - 60)
Developed by Dr. Hamwi in 1964, this formula was one of the first to provide a simple method for calculating ideal body weight.
5. Peterson Formula (2016)
Base: Same as Devine formula with age adjustments
Age 50+: Multiply base by 0.98
Age 60+: Multiply base by 0.97
The most recent formula in our calculator, the Peterson formula accounts for natural changes in body composition that occur with aging.
Understanding BMI & Healthy Weight
What is BMI?
Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing weight in kilograms by height in meters squared.
Formula: BMI = weight (kg) / height (m)²
The World Health Organization defines healthy BMI ranges as:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obese: BMI 30 or greater
BMI Limitations
While BMI is a useful screening tool, it has limitations. It doesn't distinguish between muscle and fat, so athletes with high muscle mass may have a high BMI despite being very fit. Always consider body composition alongside BMI.
Worked Example
Example Calculation
A 5'9" (69 inch) man using the Robinson formula:
Robinson Formula: 52 + 1.9 × (69 - 60) = 52 + 17.1 = 69.1 kg
For the same height, the five formulas would give:
- Robinson: 69.1 kg
- Miller: 68.1 kg
- Devine: 70.7 kg
- Hamwi: 72.3 kg
- Peterson: 70.7 kg (age 23, no adjustment)
Average: 70.2 kg | Healthy BMI Range: 58.6 – 79.1 kg
This shows how the formulas provide a range of estimates, all falling within the healthy BMI range.
Interpreting Your Results
Multiple Formulas, One Picture
When you get different results from different formulas, don't be concerned. This is normal. Consider the range of results rather than focusing on any single number.
Setting Realistic Goals
If your current weight is outside the suggested ranges:
- Small changes: Aim for gradual weight changes of 0.5-1 kg (1-2 lbs) per week.
- Focus on health: Prioritize nutritious eating and regular activity over rapid weight loss.
- Consult professionals: Talk to a doctor or dietitian for personalized advice.
Beyond the Scale
Remember that weight is just one indicator of health. Other factors like blood pressure, cholesterol levels, physical fitness, and how you feel are equally important.
Tips for a Healthy Weight Journey
- Focus on Nutrition: Choose whole foods over processed options.
- Stay Active: Aim for at least 150 minutes of moderate exercise per week.
- Get Enough Sleep: Poor sleep can affect weight and overall health.
- Manage Stress: Chronic stress can lead to weight gain.
- Stay Hydrated: Drink plenty of water throughout the day.
- Be Patient: Sustainable weight changes take time.
Common Mistakes to Avoid
- Focusing on One Number: No single number defines your health.
- Ignoring Muscle Mass: Muscle weighs more than fat.
- Comparing to Others: Every body is unique.
- Extreme Dieting: Quick fixes rarely work long-term.
- Not Consulting Healthcare Providers: Always seek professional guidance.