BMI Calculator - Calculate Body Mass Index Online
Estimate body mass index from height and weight using metric or imperial units for a quick general wellness reference.
Interactive tool
This tool runs in your browser. Enable JavaScript to use the interactive features.
Quick Guide
The BMI calculator converts your height and weight into a body mass index number and a broad category such as underweight, normal, overweight, or obese.
- Select metric or imperial units.
- Enter your height and weight.
- Calculate BMI and review the category as a general reference.
Best for: Basic health tracking, fitness planning, and quick BMI checks for adults.
What this tool does
The BMI calculator converts your height and weight into a body mass index number and a broad category such as underweight, normal, overweight, or obese.
Important note: BMI is a general screening measure and does not diagnose health. Athletes, children, pregnant users, and people with specific medical concerns should use professional guidance.
Useful examples
- Check BMI after updating weight in a fitness plan.
- Compare metric and imperial inputs when filling wellness forms.
- Use BMI as one simple reference alongside other health measures.
FAQs
Is BMI a medical diagnosis?
No. BMI is a broad screening number. It should not replace advice from a qualified healthcare professional.
Does BMI account for muscle mass?
No. BMI uses height and weight only, so it may not reflect body composition accurately for everyone.