BMI Calculator Metric (kg & cm)

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How to use this tool

Select metric units, enter weight in kilograms and height in centimeters, then calculate. Review BMI value and category label.

Worked example

Example: 70 kg and 175 cm gives a BMI near 22.9—within the normal range for adults (18.5–24.9 on standard WHO categories).

When to use this

• Quick screening with metric measurements.
• Comparing results to WHO or local health guidelines.
• Teaching BMI with SI units in education settings.

Common examples

• 70 kg and 175 cm → BMI about 22.9 (normal adult screening range).
• 180 lb and 5 ft 10 in → BMI about 25.8 (borderline overweight category for adults).
• 65 kg and 160 cm → BMI about 25.4—useful when switching from imperial height inputs.
• 62 kg, 168 cm → BMI about 22.0 for metric wellness screening context.
• 200 lb, 5 ft 4 in → BMI about 34.3—compare with metric entry for same person.

What people search for

• bmi calculator
• body mass index calculator
• bmi calculator kg cm
• bmi calculator lbs feet
• calculate bmi online

Common mistakes

• Entering height in meters when the form expects centimeters.
• Using BMI alone to assess athletic or elderly individuals.
• Treating category labels as medical advice.

Related long-tail tasks

• convert imperial bmi to metric
• find healthy weight for my height in kg
• track bmi change over time

How it works

BMI is calculated as weight in kilograms divided by height in meters squared. US units are converted to metric before calculation. Classifications follow commonly used adult BMI ranges and are for general education only.

Limitations

BMI is a population-level screening metric, not a diagnosis. Athletes, children, and pregnant users need specialized measures.

Privacy and file handling

Your data stays on your device and is not uploaded.

Accuracy & methodology

This section documents how the calculator works, what it leaves out, and when results were last reviewed. Figures are educational estimates—not professional advice—and are not labeled "current" unless tied to automatically updated reference data.

Formula source or methodology

BMI = weight (kg) ÷ height (m)². US units convert lb → kg and ft/in → meters before calculation. Classification uses WHO-style adult cut points: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obesity.

Jurisdiction

International (WHO adult categories)

Unit system

Metric (kg, cm) or US (lb, ft/in)

Rounding method

BMI rounds to one decimal place.

Assumptions

• Adult height and weight snapshot
• Standard BMI formula; not pediatric BMI-for-age

Known omissions

• Not medical advice. Does not diagnose, treat, or replace clinical assessment.
• Athletic/muscular builds, pregnancy, and ethnicity-specific ranges
• Children and teens (use child growth tool instead)
• Waist circumference or body composition

Test cases (automated)

• 70 kg, 175 cm → BMI ≈ 22.9 (normal)
• Invalid height or weight returns an error

Version & last verified

Logic version 1.0. Content and formulas last verified 2026-07-06.

Important notice

This tool provides a general estimate for educational purposes and is not medical advice. Consult a qualified healthcare professional for personal guidance.

FAQ

Frequently asked questions

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