How Much Should I Weigh? The Truth About Ideal Weight formulas

Go to any doctor's office, and they will tell you your 'ideal weight' based on a chart. But where do these numbers come from? And why do they often feel unrealistically low?

The truth is, 'ideal weight' is a statistical concept, not a biological mandate. Let's explore the science behind the numbers.

The Big Four Formulas

Most calculators uses one of four formulas derived from actuarial data (life insurance statistics):

1. 1**Devine (1974)**: Originally for calculating drug dosages. It is the most common standard.
2. 2**Robinson (1983)**: A refinement of Devine, often better for modern body types.
3. 3**Miller (1983)**: Based on height/weight studies.
4. 4**Hamwi (1964)**: The old 'Rule of Thumb' (100 lbs for 5ft + 5 lbs per inch).

The Problem with 'Ideal'

These formulas only consider height and gender. They ignore two critical factors:

• •**Frame Size**: Someone with broad shoulders and thick wrists simply weighs more than someone with a slight build, even at the same body fat.
• •**Muscle Mass**: Muscle is denser than fat. A fit person will almost always weigh more than the formula predicts.

Aim for a Range, Not a Number

Instead of obsessing over a specific number (like '135 lbs'), aim for a healthy range. The BMI range of 18.5 to 24.9 allows for a variation of about 30-40 pounds.

For example, a 5'9" man has a healthy range of roughly 125 lbs to 168 lbs. That is a massive window! Where you fall in that window depends on how much muscle you carry.

Conclusion

Use the ideal weight calculator as a rough guide, not a strict rule. If you are strong, energetic, and your health markers are good, you are at your ideal weight regardless of what a 1974 formula says.