BMI Calculator

Enter height and weight in metric or imperial units, calculate the BMI value to one decimal place, and review the adult weight category with limitations clearly noted.

Switch between kg and cm or pounds, feet, and inches before calculating BMI.

Read the category with the health caveats before sharing the number.

  • Calculate adult BMI quickly
  • Use metric or imperial units
  • Review BMI category limits

How to use BMI Calculator

Use the calculator for adult BMI only, then check units, one-decimal rounding, and category meaning before treating the result as health context.

  1. 1

    Choose metric or imperial units

    Choose metric for kilograms and centimeters or imperial for pounds, feet, and inches. Confirm the units match your source numbers before calculating because mixed units can change BMI completely.

  2. 2

    Enter height and weight

    Enter height and weight as positive values, then calculate the result. The tool returns a BMI rounded to one decimal place and places it into the matching adult category.

  3. 3

    Read the BMI category carefully

    Review the category alongside the limitations for adults. BMI does not show muscle mass, waist measurement, pregnancy status, ethnicity-related risk, or a medical diagnosis.

Metric and imperial BMI inputs

Switch between kilograms with centimeters or pounds with feet and inches, then verify the chosen unit system before calculating the BMI value.

Adult BMI category result

The result maps the calculated value to adult categories: underweight, normal weight, overweight, or obese, using the visible category table.

One-decimal BMI value

The calculator rounds BMI to one decimal place, which makes the number easy to read while still requiring context for health decisions.

Browser-side calculation

Height, weight, unit selection, calculated BMI, and category are handled in the current browser page without requiring a sign-in flow.

Clear limitation notes

The page reminds you that BMI is a screening measure and does not account for muscle, waist size, pregnancy, age, or medical history.

Reset and recalculate workflow

Reset the inputs when checking another person or scenario so height, weight, units, and category do not carry into the next calculation.

BMI Calculator privacy and processing

Height, weight, selected unit system, calculated BMI, and category stay in the browser during the current session, but the result still needs context before you use it for health decisions.

Processing Browser

Height, weight, and unit choices are processed in the browser to calculate a one-decimal BMI value and category before anything is reused outside the page.

Storage None

Closing or refreshing BMI Calculator clears the current height, weight, selected unit system, BMI value, and category from the page.

BMI Calculator account access

BMI Calculator does not require an account; use the result as a quick adult screening estimate, not as stored medical guidance.

Before You Use BMI Calculator

Check these BMI notes before interpreting a body mass index result for yourself, another adult, or a shared wellness document.

Privacy

Enter only the height and weight needed for this calculation, especially on shared screens.

Avoid storing or sharing someone else's BMI result without permission and proper context.

Accuracy

Use current adult height and weight values, then recheck the selected units before interpreting BMI.

Small unit mistakes, especially inches versus centimeters, can move a result into the wrong category.

Compatibility

This page uses adult BMI categories only and does not calculate child or teen BMI percentiles.

The result does not account for pregnancy, muscle mass, waist size, ethnicity-related risk, or medical history.

Output

Treat the BMI value as a screening number, not a complete measure of health.

Discuss unexpected, concerning, or clinical BMI results with a qualified health care professional.

Limits

BMI Calculator estimates adult body mass index from height and weight only; it does not evaluate children, pregnancy, waist size, body composition, or medical history.

Questions about BMI Calculator

When should I use BMI Calculator?

Use BMI Calculator for a quick adult body mass index estimate when you know height and weight and want the category shown beside the result.

Which units does BMI Calculator support?

BMI Calculator supports metric inputs with kilograms and centimeters, plus imperial inputs with pounds, feet, and inches for adults during one calculation.

Is BMI a medical diagnosis?

No. BMI is a screening measure based on height and weight. It does not replace medical advice or account for full health history.

Why can BMI be misleading?

BMI can be misleading because it does not measure muscle mass, waist size, pregnancy, body composition, ethnicity-related risk, or individual medical context.

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