ZovaTool

BMI Calculator

BMI
24.2
Normal
New BMI (Trefethen)
24.2
Better for tall/short
1518.5253040
BMI 24.2 — Normal
Normal
Body composition indices
BMI Prime (BMI/25)0.97
Ponderal Index14.25
Body Surface Area (BSA)1.81 m²
Waist-to-Hip Ratio (WHR)0.86 · Low risk
Waist-to-Height (WHtR)0.48 · Healthy
Healthy weight range53.5 kg – 72.0 kg
Weight to lose (to BMI 24.9)0
Weight to gain (to BMI 18.5)0
WHO categories
Severe thinness< 16
Moderate thinness16 – 16.9
Mild thinness17 – 18.4
Normal18.5 – 24.9
Overweight25 – 29.9
Obese class I30 – 34.9
Obese class II35 – 39.9
Obese class III≥ 40

How to use the BMI Calculator

  1. Pick Metric or Imperial units.
  2. Enter your height and weight accurately.
  3. Add age and sex for context-aware healthy ranges.
  4. Read your BMI and category (Underweight → Obese III).
  5. Check the New BMI (Trefethen) — more accurate for very tall/short people.
  6. Use the healthy weight range to see how much to lose or gain.
  7. Refer to the WHO category table for clinical thresholds.
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BMI — strengths, limits and what to do next

Body Mass Index is a quick screening tool that compares your weight to your height. The classic formula (kg / m²) was designed for population statistics and remains the most used metric worldwide.

The New BMI (Trefethen, 2013) uses an exponent of 2.5 instead of 2 to correct the bias against tall people (who look heavier) and short people (who look lighter). Both values are shown side-by-side.

BMI does not separate fat from muscle. Athletes can be 'overweight' by BMI while having very low body fat. Pair BMI with the Body Fat and Ideal Weight calculators for a fuller picture.

Use the healthy range row to plan a target. A safe rate of change is 0.25–0.5 kg/week — feed that into the Calorie Calculator to set your daily intake.