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May 12, 2026 Vol. I — Issue 02
RealEasyDiet.com

Real Easy Diet.

Editorial weight loss reporting. No hype. No false promises.

Tool · No. 02

BMI Calculator

Type your height and weight. We give you the number, the CDC category, and a paragraph on the things BMI doesn't see.

BMI
kg / m²
CDC category

Under 18.5
Underweight
18.5 - 24.9
Normal
25 - 29.9
Overweight
30+
Obesity

BMI is a screening tool, not a diagnosis. It cannot tell muscle from fat, see visceral adipose tissue, or replace lab work. Use it as one data point.

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What BMI is good for — and not

BMI was invented in 1832 by a Belgian astronomer named Adolphe Quetelet. He was studying populations, not patients. The number is fast, free, and reasonably useful as a population-level screening tool. The trouble starts when a single person tries to use it as a verdict.

At the same BMI, two people can have radically different health. A heavily-trained person can land in the "overweight" range with low body fat and great cardiovascular markers. A sedentary person at "normal" BMI can have high visceral fat and elevated fasting glucose. The number does not see what is going on under the skin.

Better numbers to look at

  • Waist circumference. Cheap, repeatable, and a stronger predictor of metabolic risk than BMI alone.
  • Resting heart rate and blood pressure. Free at any pharmacy or doctor's office.
  • Fasting glucose and HbA1c. A standard blood-panel item that catches early metabolic shifts.
  • How you feel walking up a hill. Subjective but informative.

FAQ

Is BMI accurate?

BMI is a population-level screening number. It does not measure body fat, muscle, or bone density. A 200-lb linebacker and a 200-lb sedentary person at the same height have the same BMI and very different health profiles.

What's a 'healthy' BMI?

The CDC defines 18.5 to 24.9 as the normal range for adults. Below 18.5 is underweight. 25.0 to 29.9 is overweight. 30 and above is obesity. These cutoffs were never meant to be used as a personal verdict — they were designed for tracking populations.

Should I worry about my BMI?

On its own, no. Pair it with waist circumference, blood pressure, fasting glucose, lipid panel, and how you feel day-to-day. Your doctor cares about all of those — not the BMI number alone.

Related on Real Easy Diet

Sources

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