Determine your ideal weight range based on height, BMI, and common formulas.
Calculate Your Ideal Weight
Enter height in centimeters (e.g., 170).
Centimeters (cm)
Inches (in)
Feet and Inches (ft'in")
Select your preferred height measurement unit.
Enter feet.
Enter inches (0-11).
Your Weight Calculation Results
BMI Range
Hamwi Formula (Ideal Weight)
Devine Formula (Ideal Weight)
Robinson Formula (Ideal Weight)
These calculations provide estimates. Consult a healthcare professional for personalized advice.
Weight Calculation Formulas Overview
Formula Name
Description
Calculation (for 5'10" male, 150 lbs)
Result (approx.)
BMI
Body Mass Index categorizes weight relative to height.
150 lbs / (70 in)^2 * 703 = 21.5
Healthy: 18.5 – 24.9
Hamwi
A widely used, simple estimation formula.
106 lbs for first 5ft + 6 lbs/inch = 106 + (10*6) = 166 lbs
~166 lbs (Male) ~146 lbs (Female)
Devine
Another popular estimation, often used in medical contexts.
50 kg for first 5ft + 2.3 kg/inch = 50 + (10*2.3) = 73 kg (~161 lbs)
~161 lbs (Male) ~146 lbs (Female)
Robinson
A more recent adjustment to the Devine formula.
52 kg for first 5ft + 1.9 kg/inch = 52 + (10*1.9) = 71 kg (~156.5 lbs)
~156.5 lbs (Male) ~142.5 lbs (Female)
Height vs. Weight Comparison
Ideal weight ranges based on height for a typical adult male and female, using common formulas.
What is Healthy Weight Calculation?
Healthy weight calculation refers to the process of determining an individual's appropriate weight range for their height. It's a crucial aspect of understanding overall health and well-being. Maintaining a weight that is within a healthy range can significantly reduce the risk of numerous chronic diseases, including heart disease, type 2 diabetes, certain cancers, and high blood pressure. This calculation isn't about achieving a specific number but rather finding a sustainable and healthy balance that supports bodily functions and longevity. It's essential to remember that these are general guidelines, and individual needs can vary greatly due to genetics, body composition, and lifestyle.
Who should use a healthy weight calculator? Anyone concerned about their current weight, looking to achieve weight goals, or simply wanting to understand their health status better can benefit. Pregnant women, athletes with significant muscle mass, and individuals with certain medical conditions may find these standard calculations less accurate, and should always consult with a healthcare professional for personalized guidance.
Common misconceptions about healthy weight calculation: One major misconception is that there's a single "ideal" weight for everyone of a certain height. In reality, a healthy weight exists within a range. Another is that weight alone dictates health; body composition (muscle vs. fat), activity levels, and metabolic health are equally, if not more, important. Finally, many believe quick fixes are the answer, but sustainable healthy weight management is a long-term lifestyle commitment.
Healthy Weight Calculation Formula and Mathematical Explanation
Calculating a healthy weight involves several methods, each with its own mathematical basis. The most common approach involves using Body Mass Index (BMI) and various estimation formulas that take height into account.
Body Mass Index (BMI)
BMI is a widely used screening tool that estimates body fat based on height and weight. It's calculated using the following formula:
These formulas provide an estimated ideal weight based on height, often with adjustments for sex. They are simplifications designed for quick estimates.
Hamwi Formula:
This formula is straightforward. It assigns a base weight for the first 5 feet of height and adds a fixed amount for each inch above that.
Males: 106 lbs for the first 5 feet + 6 lbs for each inch over 5 feet.
Females: 100 lbs for the first 5 feet + 5 lbs for each inch over 5 feet.
Devine Formula:
Similar to Hamwi, this formula uses metric weights (kilograms) as a base and adds for each inch above 5 feet.
Males: 50 kg for the first 5 feet + 2.3 kg for each inch over 5 feet.
Females: 45.5 kg for the first 5 feet + 2.3 kg for each inch over 5 feet.
Robinson Formula:
A slightly adjusted version of the Devine formula.
Males: 52 kg for the first 5 feet + 1.9 kg for each inch over 5 feet.
Females: 49 kg for the first 5 feet + 1.7 kg for each inch over 5 feet.
Variables and Units:
Variable
Meaning
Unit
Typical Range
Height
Vertical measurement from base to top.
cm, in, ft/in
140 cm – 200 cm (approx.)
Weight
Mass of the body.
kg, lb
35 kg – 150 kg (approx. for healthy range)
BMI
Body Mass Index
kg/m² or lb/in² * 703
18.5 – 24.9 (Healthy)
Hamwi Base
Initial weight estimate for 5 feet.
lbs or kg
100-106 lbs (Female), 106-137 lbs (Male)
Hamwi Increment
Weight added per inch over 5 feet.
lbs or kg
5-6 lbs (Female), 6-6.35 kg (Male)
Devine/Robinson Base
Initial weight estimate for 5 feet.
kg
45.5-49 kg (Female), 50-52 kg (Male)
Devine/Robinson Increment
Weight added per inch over 5 feet.
kg
1.7-2.3 kg (Female), 1.9-2.3 kg (Male)
Practical Examples (Real-World Use Cases)
Understanding how these calculations apply in real life can make them more meaningful.
Example 1: Sarah, a 30-year-old woman
Sarah is 165 cm tall and weighs 62 kg. She wants to know if her weight is within a healthy range.
Calculation:
Height in meters: 1.65 m
BMI = 62 kg / (1.65 m)² = 62 / 2.7225 ≈ 22.77
Interpretation:
Sarah's BMI of approximately 22.77 falls within the healthy weight range (18.5-24.9). She is likely at a healthy weight for her height.
Example 2: Mark, a 45-year-old man
Mark is 5 feet 10 inches tall (70 inches) and wants to estimate his ideal weight. He previously weighed 180 lbs but is aiming for a healthier range.
Ideal Weight (kg) = 50 kg (for first 5ft) + 2.3 kg/inch * 10 inches = 50 + 23 = 73 kg.
Ideal Weight (lbs) = 73 kg * 2.20462 ≈ 161 lbs.
Interpretation:
Mark's current weight of 180 lbs might put him in the overweight category based on BMI. The Hamwi formula suggests an ideal weight around 166 lbs, while the Devine formula suggests around 161 lbs. These values give him a target range to aim for to improve his health. The calculator also provides a BMI range, which would show his current BMI and help him understand his position relative to healthy guidelines.
How to Use This Healthy Weight Calculator
Our calculator is designed for ease of use, providing quick insights into your healthy weight.
Enter Your Height: Input your height accurately in the provided field. Select your preferred unit (cm, inches, or feet and inches) using the dropdown. If you choose "Feet and Inches," separate fields will appear for you to enter both values.
Click "Calculate": Once your height is entered, press the "Calculate" button.
Review Results: The calculator will instantly display:
Primary Result: Your estimated ideal weight range based on the most common formulas (often focused on BMI or a selected formula like Hamwi).
BMI Range: The weight range corresponding to a healthy BMI (18.5-24.9) for your height.
Specific Formula Results: Ideal weight estimates from Hamwi, Devine, and Robinson formulas.
Understand the Data:
Primary Result & BMI Range: These offer a general healthy weight bracket.
Formula Results: These provide specific estimated ideal weights. Differences between formulas are normal.
Decision Making: Use these results as a guide. If you are significantly outside the healthy BMI range or have concerns, consult a healthcare professional. This tool is for informational purposes and does not replace medical advice.
Reset or Copy: Use "Reset" to clear the fields and start over. Use "Copy Results" to save or share the calculated information.
Key Factors That Affect Healthy Weight Calculations
While height and weight are the primary inputs, several other factors influence what constitutes a "healthy" weight for an individual.
Body Composition (Muscle vs. Fat): Muscle is denser than fat. An individual with a high muscle mass might weigh more but have a lower body fat percentage, placing them in a healthy category despite a higher weight. Standard BMI does not differentiate between muscle and fat.
Age: Metabolic rates can slow with age, potentially affecting ideal weight ranges and body composition. A weight considered healthy for a younger person might need adjustment for an older adult.
Sex/Gender: Biological differences in body composition and hormone levels mean that men and women of the same height often have different healthy weight ranges. Formulas often include separate calculations or base weights for males and females.
Genetics: Predisposition to certain body types and metabolic efficiencies plays a role. Some individuals may naturally carry more weight or find it harder to lose weight due to their genetic makeup.
Frame Size: Bone density and skeletal structure can influence overall weight. A person with a larger bone structure may naturally weigh more than someone with a smaller frame of the same height.
Activity Level: Regular physical activity can influence body composition, muscle mass, and overall health, regardless of weight. Athletes, for instance, may have higher weights due to muscle development.
Medical Conditions: Certain health issues (e.g., thyroid problems, fluid retention) and medications can significantly impact weight and may necessitate personalized weight goals outside standard calculations.
Frequently Asked Questions (FAQ)
Q1: Is BMI the only factor for healthy weight?
No. While BMI is a useful screening tool, it doesn't account for body composition (muscle vs. fat), bone density, or overall health. It's best used in conjunction with other health indicators and professional medical advice.
Q2: Why do different formulas give different ideal weights?
Different formulas use varying base weights, increments per inch, and sometimes different starting points (e.g., kg vs. lbs). They are all estimations, and the variation reflects the complexity of human physiology and the limitations of simple formulas.
Q3: Can I be overweight according to BMI but still be healthy?
Yes. This is often the case for very muscular individuals. Their muscle mass can elevate their BMI into the overweight or even obese category, despite having a low percentage of body fat and excellent cardiovascular health.
Q4: How do I convert my weight if it's in kilograms?
To convert kilograms to pounds, multiply the weight in kg by 2.20462. For example, 60 kg * 2.20462 = 132.28 lbs.
Q5: How do I convert my height if it's in feet and inches to centimeters?
First, convert feet to inches: multiply feet by 12. Then add the remaining inches. Finally, convert total inches to centimeters: multiply total inches by 2.54. For example, 5 feet 10 inches is (5 * 12) + 10 = 70 inches. 70 inches * 2.54 cm/inch = 177.8 cm.
Q6: Should I aim for the lower or higher end of the healthy BMI range?
The healthy BMI range (18.5-24.9) is quite broad. For most individuals, aiming for the middle of this range (around 21-22) is often a good starting point. However, factors like age, muscle mass, and personal well-being should be considered. Consulting a doctor is recommended.
Q7: What if my calculated ideal weight feels unrealistic?
This is common. These formulas are simplifications. Focus on sustainable lifestyle changes, improved nutrition, regular exercise, and how you feel overall, rather than rigidly adhering to a single number. Consult a health professional or registered dietitian for a personalized plan.
Q8: How often should I recalculate my healthy weight?
Your height typically remains constant after adolescence. Your weight, however, can fluctuate. It's beneficial to periodically review your weight and BMI (e.g., annually or if you experience significant lifestyle changes) to ensure you remain within a healthy range. However, focus on consistent healthy habits rather than constant recalculations.
Related Tools and Resources
BMI CalculatorCalculate your Body Mass Index with our easy-to-use tool.
Calorie CalculatorEstimate your daily calorie needs based on your BMR and activity level.