BMI Calculator in kg and cm
If you work in metric units — kilograms for weight and centimetres for height — this BMI calculator is set up for you by default. No need to toggle units or convert from pounds and inches. Simply enter your weight in kg and height in cm, and get your BMI score instantly with clear WHO category labelling. The metric system is used by the vast majority of the world's population and is the standard in medical and scientific literature, making metric BMI values directly comparable to those in clinical guidelines and research papers.
Your Details
Applies lower thresholds for overweight/obese per WHO Asia guidelines.
Example Use Cases
A person weighing 70 kg and measuring 175 cm has a BMI of 22.9 — right in the middle of the normal range.
A person weighing 90 kg at 168 cm has a BMI of 31.9 — classified as Obese Class I under WHO guidelines.
How to Interpret Your Results
The BMI formula in metric is straightforward: weight (kg) ÷ height (m)². Remember to convert cm to metres by dividing by 100. A BMI of 18.5–24.9 is considered normal. If you're in a region that uses Asian BMI categories (e.g., India, Singapore, Japan), toggle the 'Asian BMI' option for revised thresholds.
Frequently Asked Questions
Methodology & Limitations
Formulas Used
**BMI = weight (kg) ÷ height (m)²**. The formula was devised by Adolphe Quetelet in the 1830s and adopted by the WHO for population-level screening.
Page-Specific Notes
This page defaults the unit toggle to metric (kg/cm). The underlying calculation is identical to the primary BMI Calculator page.
Limitations
BMI does not distinguish between muscle and fat mass. Athletes, pregnant women, the elderly, and highly muscular individuals may receive misleading results. BMI is a screening tool, not a diagnostic measure.
Sources & Citations
- World Health Organization. Obesity and Overweight Fact Sheet. 2024.
- WHO Expert Consultation. Appropriate body-mass index for Asian populations. Lancet. 2004;363(9403):157-163.
Medical Disclaimer: This calculator provides estimates based on published formulas and is not a substitute for professional medical advice. Always consult a qualified healthcare provider before making changes to your diet or exercise routine.
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