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BMI Calculator

Body Mass Index from height and weight (metric or imperial), with standard adult category labels — a screening number, not a diagnosis.

Estimates only — not professional financial, medical, legal or engineering advice. Read full disclaimer.

Result

Fill in the form and click Calculate to see your result here.

How it's calculated

BMI = kg / m² after converting lb/in if imperial is selected. Categories use standard WHO adult cut-offs encoded in the handler.

Example

Example: BMI Calculator

Inputs

  • Unit System: metric
  • Weight: 70
  • Height: 170

Outputs

  • Bmi: 24.2
  • Category: Normal weight

This example uses typical sample values. Adjust the inputs above to see how the results change for your own numbers.

About this calculator

BMI is weight(kg) / height(m)². This calculator accepts metric or imperial units, converts internally, then labels WHO-style adult bands (underweight, normal, overweight, obesity classes).

BMI ignores muscle, frame, and ethnicity nuances. Athletes and older adults are regularly mis-sorted. Nepal clinical use should follow a clinician, not a colour bar. Pair with calorie/BMR tools only as context, never as a crash-diet prescription.

Frequently Asked Questions

WHO adult BMI = weight(kg) / height(m)². Metric: height in cm is divided by 100. Imperial: lb × 0.45359237 and inches × 2.54 → cm, then the same equation. Result kg/m² to 1 decimal.
WHO adult groups used here: <18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, ≥30 obese. Asian-specific clinic cut-offs (e.g. 23) are not applied unless you interpret them yourself.
No. It does not measure fat, muscle or visceral fat. Athletes and some clinical conditions need a clinician, not this label.
Weight corresponding to BMI 18.5–24.9 at your height (kg). A screening band, not a prescription.
Pediatric BMI uses age/sex percentiles (CDC/WHO growth charts). This adult table is the wrong tool for school-age screening.
BMI interpretation differs. Do not use adult bands to “diet” in pregnancy without obstetric advice.
Imperial mode expects inches in the height field (e.g. 67), not 5.7 as feet.
WHO bands still compute; sarcopenia can hide high risk at “normal” BMI. Clinical context required.
Not in this engine. Pair if a clinician asked for both.
Quetelet index as used by WHO adult classification — screening, not a lab test.

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