SimpleToolsNow
language

Home chevron_right Text Tools chevron_right BMI Calculator Online Free — Body Mass Index

monitor_weight

BMI Calculator Online Free — Body Mass Index

Calculate your Body Mass Index (BMI) instantly with metric or imperial units.

monitor_weight BMI Calculator Online Free — Body Mass Index
verified_user Your files are processed only as needed and are not stored after the tool finishes.
Body Mass Index (BMI) is a simple measurement that uses your height and weight to estimate whether your weight is in a healthy range. It is calculated as weight (kg) divided by height squared (m²). Our free BMI calculator supports both metric (kilograms and centimeters) and imperial (pounds and inches) units, and instantly shows your BMI value along with the standard WHO category — Underweight, Normal weight, Overweight, or Obese. BMI is a screening tool, not a diagnostic tool — consult a healthcare professional for a complete health assessment.

Frequently Asked Questions

Is BMI an accurate health measure? expand_more
BMI is a useful population-level screening tool but has limitations for individuals — it does not account for muscle mass, age, sex, or body composition. Athletes may have a high BMI despite being healthy.
What are the BMI categories? expand_more
Below 18.5: Underweight. 18.5–24.9: Normal weight. 25–29.9: Overweight. 30 and above: Obese.

Related Tools

percent
Free

Percentage Calculator Online Free

Calculate percentages, percentage changes, and what percent X is of Y.

arrow_forward
cake
Free

Age Calculator Online Free

Calculate your exact age in years, months, and days from your date of birth.

arrow_forward
payments
Free

Tip Calculator Online Free — Split Bill Easily

Calculate tip and split the bill among multiple people instantly.

arrow_forward
date_range
Free

Date Difference Calculator Online Free

Calculate the exact number of days, weeks, months and years between two dates.

arrow_forward