BMI Calculator
Calculate your Body Mass Index using CDC guidelines. Enter your weight and height to get instant results.
BodyStd · https://bodystd.com/ · 8/10/2026
BMI Calculator
Calculate your Body Mass Index using CDC guidelines. Enter your weight and height to get instant results.
Body Type
Year Standard
BMI Result
BMI Categories
CDC BMI Category Guides
Dig deeper into your CDC BMI category. Each guide covers the official range, health risks, and CDC recommendations.
Underweight Range (Below 18.5)
Causes, risks, and a plan for healthy weight gain based on CDC guidance.
Normal Weight Range (18.5-24.9)
The target band for most adults, the science behind it, and how to stay there.
Overweight Range (25.0-29.9)
How risk rises across this band, waist circumference cutoffs, and lifestyle steps.
Obese Range (30.0+)
Obesity Classes I-III, comorbidities, and the CDC stepped-care treatment model.
Authority Source
This calculator uses CDC BMI guidelines and formulas, which are the standard for body weight classification in the United States.CDC BMI guidelines.
Frequently Asked Questions
Disclaimer: This calculator is for educational and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider with questions about a medical condition.
How to measure your height
Height is the input for BMI and many ratios, so a small error changes the result. Use a stadiometer when possible; at home, a flat wall and a hard-backed book work.
Steps
- Remove shoes and bulky clothing; stand with heels, buttocks, shoulders, and the back of your head against a flat wall.
- Keep your head level (the lower eye socket and ear opening horizontal) and look straight ahead.
- Breathe in normally and stand as tall as you can; mark the wall at the top of your head.
- Measure from the floor to the mark with a metal tape, to the nearest 0.1 cm (or 1/4 inch).
Common errors to avoid
- Measuring in the evening — the spine compresses about 1–2 cm by the end of the day.
- Slouching, keeping shoes on, or flattening the hair when marking.
These are measurement tips, not medical advice. For interpretation, consult a qualified healthcare professional. How to measure your waist correctly.
Related BMI Guides & CDC Charts
CDC BMI Chart for Adults
Full CDC BMI chart with underweight, normal, overweight, obese bands plus weight-by-height table.
Underweight BMI (Below 18.5)
CDC underweight classification, health risks, causes, and a plan for healthy weight gain.
Normal Weight BMI (18.5-24.9)
CDC normal weight band, health benefits, and maintenance guidance for adults.
Overweight BMI (25-29.9)
CDC overweight classification, health risks, and lifestyle modification guidance.
BMI 30 Obese: CDC Classes I-III
Health risks and CDC treatment stages for BMI 30+, 35+, and 40+.
Healthy BMI Range (18.5-24.9)
Full CDC adult BMI chart with underweight, normal, overweight, and obese thresholds.
Limitations of BMI
Why BMI misses muscle mass, fat distribution, ethnicity, and age. Better metrics.
BMI by Age Calculator
CDC percentiles for kids and teens (2-19) plus adult BMI by age group.
US vs Asian BMI Chart
Asian overweight cutoff is BMI 23 and obese is 27.5 per WHO. See the full comparison.
Healthy Weight Range
Find the weight range that keeps your BMI between 18.5 and 24.9 for your height.
Ethnic BMI Differences
How BMI, body fat, and disease risk differ for Asian, Black, Hispanic, and white Americans.
Body Fat Calculator (US Navy)
Estimate body fat % from neck, waist, and hip measurements. A useful complement to BMI.
Waist-to-Hip Ratio
Assess abdominal obesity and cardiometabolic risk alongside your BMI result.