Height to Weight Calculator
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Understanding the Height to Weight Ratio
The relationship between your height and weight is one of the most fundamental indicators of general health. While no single number can capture the complexity of human biology, tools like the BMI (Body Mass Index) and the Ideal Body Weight (IBW) formulas provide a scientifically-backed baseline for evaluating physical health status.
How Ideal Body Weight is Calculated
This calculator utilizes the Devine Formula, which is the most widely used clinical standard for determining ideal weight based on height. The formula assumes a base weight for the first 5 feet of height and adds a specific increment for every inch thereafter:
- Men: 50.0 kg + 2.3 kg per inch over 5 feet.
- Women: 45.5 kg + 2.3 kg per inch over 5 feet.
BMI Categories Explained
Body Mass Index is a simple calculation using your height and weight. The formula is weight (kg) / [height (m)]². The World Health Organization (WHO) classifies the results into these categories:
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Healthy Weight |
| 25.0 – 29.9 | Overweight |
| 30.0 or Higher | Obese |
Example Calculation
Consider a male who is 5'10" (70 inches) tall and weighs 180 lbs:
- Height: 10 inches over 5 feet.
- IBW: 50kg + (2.3kg × 10) = 73kg (approx. 161 lbs).
- BMI: 25.8 (Classified as Overweight).
- Target: To reach a "Healthy" BMI (24.9), his weight should be approximately 174 lbs.
Limitations to Consider
While these formulas are excellent for the average person, they do not account for muscle mass, bone density, or body fat distribution. Athletes and bodybuilders often have high BMI scores despite having very low body fat, because muscle weighs more than fat by volume.