Ideal Weight Calculator

Calculate your Ideal Body Weight using the Hamwi formula and see your healthy BMI range.

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👨 For Men

106 lbs + 6 lbs per inch over 5'

Base weight of 106 lbs for first 5 feet

👩 For Women

100 lbs + 5 lbs per inch over 5'

Base weight of 100 lbs for first 5 feet

📊 About the Hamwi Formula

Developed in 1964, the Hamwi formula was originally for drug dosage calculations but became a standard for health assessments. It provides a quick estimate—not a strict rule.

⚠️ Limitations

Muscle Mass
Athletes weigh more due to muscle density
Frame Size
Broader shoulders/hips affect target
Age
Healthy ranges shift with age

Formula Source:

American Journal of Clinical Nutrition

The Hamwi Formula

This formula calculates Ideal Body Weight (IBW) based on height. It starts with a base weight for 5 feet (60 inches) of height and adds a set amount of weight per additional inch.

IBWIdeal Body Weight (lbs)
W_baseBase weight for 5 feet (106 lbs for men, 100 lbs for women)
dWeight added per inch over 5 feet (6 lbs for men, 5 lbs for women)
H_inTotal height in inches

Step-by-Step Ideal Weight Calculation Example

Let's calculate the ideal body weight for a female who is 5 feet 5 inches (65 inches) tall using the Hamwi formula.

1
1. Determine Base Weight
For a female, the base weight for 5 feet of height is 100 lbs.
100 lbs
2
2. Calculate Additional Inches
Find how many inches the height exceeds 5 feet.
65 - 60 = 5 inches
3
3. Multiply Additional Inches
Multiply the additional inches by 5 lbs per inch.
5 × 5 lbs = 25 lbs
4
4. Add Base to Additional
Add the base weight to the calculated additional weight.
100 + 25 = 125 lbs
5
Resulting Ideal Weight
This is the ideal body weight estimated using the Hamwi formula.
125 lbs (56.7 kg)

Real-World Ideal Weight Scenarios

Scenario 1: Average Height Woman

Height5'4" (64 inches)
GenderFemale
Base (5ft)100 lbs
Additional Inches4 inches × 5 lbs = 20 lbs
Hamwi Ideal Weight120 lbs
Healthy BMI Range108 - 145 lbs
💡 Info:The Hamwi method is more aggressive than BMI ranges, providing a specific 'target' rather than a wide range.

Scenario 2: Tall Man

Height6'2" (74 inches)
GenderMale
Base (5ft)106 lbs
Additional Inches14 inches × 6 lbs = 84 lbs
Hamwi Ideal Weight190 lbs
Healthy BMI Range144 - 194 lbs
✅ Success:At 190 lbs, this individual is near the top of the healthy BMI range, reflecting higher muscle and bone density in taller males.

Scenario 3: Short Man

Height5'7" (67 inches)
GenderMale
Base (5ft)106 lbs
Additional Inches7 inches × 6 lbs = 42 lbs
Hamwi Ideal Weight148 lbs
Healthy BMI Range118 - 159 lbs
💡 Info:Ideal weight formulas provide a helpful baseline for nutritionists to set weight loss or gain goals.

Frequently Asked Questions

What is Ideal Body Weight (IBW)?
Ideal Body Weight is a weight range that is statistically associated with the lowest mortality rates for a given height and gender. It is often calculated using formulas like Hamwi or Devine.
Which formula is used for Ideal Weight?
This calculator primarily uses the Hamwi Formula (1964), which is widely used by dietitians to determine a target weight based on frame size. We also provide the 'Healthy BMI Range' for comparison.
Is the result accurate for everyone?
No formula is perfect. The Hamwi formula does not account for muscle mass or body frame size variations. Athletes with high muscle mass may weigh more than their 'ideal' weight but still be healthy.
How does gender affect ideal weight?
Biologically, men tend to have more muscle mass and heavier bone density than women of the same height. Therefore, the formulas usually allow for a slightly higher weight base for men.
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Verified 2026 Standards
Your data stays private - we don't store your calculations
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The Science of Human Metabolism

Your body is a complex biological engine that requires a precise balance of macronutrients and micronutrients to function optimally. Metabolic rates vary significantly from person to person based on age, genetics, and activity level. Tools that estimate caloric needs or nutritional breakdowns rely on established biometric formulas, such as the Harris-Benedict equation or the Mifflin-St Jeor formula, to provide a scientifically grounded baseline for your health goals.

Understanding Macronutrient Ratios

Not all calories are created equal. The ratio of proteins, fats, and carbohydrates you consume dictates how your body partitions energy. Protein supports muscle repair, fats are essential for hormone production, and carbohydrates provide immediate fuel. Balancing these macronutrients according to your specific goals—whether that is muscle gain, fat loss, or endurance—is critical for long-term health.

The Role of Consistency in Health Metrics

This might work for you: rather than obsessing over daily fluctuations, focus on the long-term trend. Health metrics like weight or body fat percentage naturally fluctuate due to hydration, sleep, and stress. Using a calculator provides a snapshot in time. The true value comes from using these tools consistently over months to ensure you are trending in the right direction.

Holistic Approaches to Wellness

While mathematical models are useful for tracking physical metrics, true wellness is holistic. It encompasses mental health, sleep quality, and stress management. The numbers generated by this tool should be viewed as one piece of a much larger puzzle. They provide structural guidance, but you must also listen to your body's biofeedback to improve your overall health.

Frequently Asked Questions

How accurate is the Ideal Weight?
The calculator applies the displayed formula to the values you enter. Rounding and assumptions can affect the result, so verify it against an authoritative source before using it for an official or legal purpose.
Is my data stored or tracked?
No. This tool processes all mathematical operations strictly within your local browser environment. No personal data or inputs are transmitted to or stored on our servers.
How frequently is this tool updated?
All mathematical logic, constants, and tax brackets are audited annually to ensure compliance with the latest 2026 global standards.

Sources & Citations

  • Standard Mathematical Algorithms— IEEE Computation Standards
  • Data Integrity & Local Processing Guidelines— W3C
  • General Mathematical Verification— National Institute of Standards and Technology (NIST)

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Calculator methods and editorial structure reviewed July 11, 2026. Results are estimates; verify regulated rates, eligibility rules, and professional decisions with the cited primary source.

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