Useful for
- Check everyday numbers before making a purchase, quote, or budget decision.
- Compare inputs quickly when you do not want to open a spreadsheet.
- Verify math for work, school, invoices, ads, or personal planning.
BMI Calculator
Calculate your body mass index from height and weight in metric or imperial units.
BMI
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Tool guide
How to use BMI Calculator
BMI Calculator gives you a focused way to handle one small task quickly. Calculate body mass index from height and weight in metric or imperial units. It is free to use, requires no login, and is built for quick checks when you need a practical result.
Example
For example, use BMI Calculator to enter the values from a receipt, estimate, campaign report, or planning note, then copy the result into your document or message.
Good to know
Results are meant for quick planning and double-checking. For legal, tax, or financial decisions, review the numbers with a qualified professional.
How it works
The BMI calculator uses height and weight to estimate body mass index. It works with metric units (centimeters and kilograms) or imperial units (feet and pounds) and shows the result with a weight category.
Metric: BMI = weight (kg) / height (m)². Imperial: BMI = (weight (lbs) × 703) / height (in)².
Practical examples
- A person who is 170 cm and 70 kg has a BMI of about 24.2 (normal weight).
- A person who is 5 ft 8 in and 180 lbs has a BMI of about 27.4 (overweight).
- Compare results when switching between metric and imperial units.
Common mistakes
- BMI does not measure body fat directly and may not be accurate for athletes, older adults, or people with higher muscle mass.
- Use the correct unit for height and weight. Mixing cm with lbs or ft with kg will give a wrong result.
Questions
Is BMI a health diagnosis?
No. BMI is a screening tool, not a medical diagnosis. Talk to a health professional for personal advice.
Does BMI work for children?
This calculator is designed for adults. Children and teens use age- and sex-specific BMI percentiles.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered normal weight.