Weight Loss & Nutrition
Connect calorie targets, macro planning, BMI context, and protein intake instead of checking each metric in isolation.
⚖️ Ideal Weight Calculator
Calculate your ideal body weight using multiple scientific formulas
📏 Your Information
💡 This calculator uses four proven scientific formulas to determine your ideal weight based on height and gender.
📊 Your Ideal Weight
Average Ideal Weight
--
Based on 4 formulas
🎯 Healthy Weight Range (BMI 18.5-25)
--
to
--
Based on healthy BMI range for your height
Formula Breakdown
Robinson (1983)
--
Most commonly used by physicians
Miller (1983)
--
Similar to Robinson with slight adjustments
Devine (1974)
--
Used in medication dosing calculations
Hamwi (1964)
--
Original formula for ideal body weight
Formula Comparison
💡 Personalized Recommendations
📚 Understanding Ideal Weight Formulas
What is Ideal Body Weight?
Ideal body weight (IBW) is an estimate of what you should weigh based on your height and gender. These formulas were developed by researchers and physicians to establish healthy weight guidelines and dosing standards for medications. While BMI is more commonly used today, IBW formulas remain relevant in medical contexts.
The Four Formulas Explained
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
Most commonly cited formula, based on extensive population studies.
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
Similar to Robinson with slightly different coefficients.
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
Widely used in pharmacy for medication dosing calculations.
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
The original IBW formula, still used as a quick estimation tool.
IBW vs BMI: Which is Better?
Both methods have their uses:
- IBW Formulas: Simple height-based calculations, useful for medical dosing and quick estimates
- BMI: Provides a range rather than a single number, accounts for different body frames
- Best Approach: Use both as guidelines, consider body composition, muscle mass, and overall health
Important Considerations
- Body Frame: These formulas don't account for small, medium, or large frames
- Muscle Mass: Athletes and muscular individuals may weigh more than IBW
- Age: Muscle mass naturally decreases with age, affecting ideal weight
- Health Status: Medical conditions can affect what's considered healthy
- Individual Variation: Genetics and body composition vary significantly
Adjusting for Body Frame
If you have a:
- Small Frame: Subtract 10% from the calculated ideal weight
- Medium Frame: Use the calculated ideal weight as is
- Large Frame: Add 10% to the calculated ideal weight
Healthy Weight Management
- Focus on body composition, not just the scale
- Build muscle through strength training
- Maintain a balanced, nutritious diet
- Stay physically active (150+ minutes per week)
- Get adequate sleep (7-9 hours per night)
- Manage stress effectively
- Stay hydrated throughout the day
- Consult healthcare professionals for personalized guidance
When to Seek Professional Advice
- Significant weight loss or gain (>10% body weight in 6 months)
- Difficulty maintaining a healthy weight
- Eating disorders or disordered eating patterns
- Medical conditions affecting weight
- Planning a weight loss or gain program
Frequently Asked Questions
Which formula is most accurate?
The Robinson formula (1983) is most commonly used by physicians and is considered the most reliable for general populations. However, all four formulas provide similar results. The best approach is to use the average of all formulas and consider it as a guideline rather than an absolute target.
Why do the formulas give different results?
Each formula was developed by different researchers using different population samples and methodologies. The differences are usually small (within 5-10 pounds) and reflect the natural variation in what's considered "ideal" for different body types and populations.
Should I adjust for my body frame?
Yes, body frame matters. If you have a small frame, subtract 10% from the calculated weight. If you have a large frame, add 10%. To determine your frame size, wrap your thumb and middle finger around your wrist. If they overlap significantly, you have a small frame. If they just touch, medium frame. If they don't touch, large frame.
Are these formulas accurate for athletes?
No, these formulas don't account for muscle mass. Athletes and very muscular individuals will often weigh more than their calculated ideal weight due to higher muscle mass. For athletes, body composition analysis (body fat percentage) is more useful than ideal weight formulas.
What's the difference between ideal weight and healthy weight?
Ideal weight formulas give a single target number, while healthy weight is typically a range (shown in our BMI-based range). Healthy weight accounts for individual variation and is generally more realistic. Most people can be healthy at weights above or below their calculated "ideal" weight.
How should I use these results?
Use these results as general guidelines, not absolute targets. Focus on the healthy weight range rather than a single number. Consider your body composition, how you feel, your energy levels, and overall health markers. Consult with healthcare professionals for personalized advice, especially if you're planning significant weight changes.
🧭 Guided Journeys
Use a workflow instead of stopping at one result
These grouped paths are designed to help you continue with the most common follow-up calculations in this category.
Pregnancy Planning
Move from due dates to ovulation timing and pregnancy weight goals using one focused planning flow.
Running & Fitness Tracking
Benchmark pace, VO2 max, hydration, and heart-rate targets to build a more realistic training plan.