This health calculator brings together the common body metrics — BMI, BMR, body-fat estimate, daily calorie needs, and waist-to-height ratio — as general-purpose wellbeing references. They are useful starting points for understanding your numbers, not medical diagnoses.
What the metrics mean
Body Mass Index (BMI) is weight divided by height squared, a quick screen that sorts most people into broad ranges but ignores muscle and build. Basal Metabolic Rate (BMR) estimates the calories your body burns at rest, and combined with an activity factor gives an approximate daily calorie need (TDEE) for maintaining weight. Waist-to-height ratio is a simple check of central fat that many find more telling than BMI alone.
These figures are calculated from standard formulas (such as Mifflin-St Jeor for BMR) using your height, weight, age, and sex. They give a consistent baseline you can track over time, which is often more useful than any single reading.
Using the numbers sensibly
Population formulas describe averages, so they fit a muscular athlete or an unusual build poorly — a strong person can read 'overweight' on BMI despite low body fat. Use the results as a rough guide and a way to monitor trends, and consult a qualified healthcare professional for advice tailored to you before making significant diet or exercise changes.
Calculating BMI for someone 1.8 m tall weighing 75 kg.
- BMI = weight ÷ height² .
- BMI = 75 ÷ (1.8 × 1.8) = 75 ÷ 3.24.
- BMI ≈ 23.1.
A BMI of about 23 sits within the typical 'healthy weight' range — a screen, not a diagnosis.
