Calculate your Body Mass Index instantly. Get your BMI category, healthy weight range, and personalized insights based on your height and weight.
Your Measurements
ft
in
lbs
cm
kg
yrs
Your BMI Results
24.7
Normal weight
1518.5253040+
<18.5
Underweight
18.5–24.9
Normal
25–29.9
Overweight
≥30
Obese
Healthy Weight Range
125–168 lbs
To Reach Normal BMI
On track
Ideal Body Weight
166 lbs
Est. Body Fat
18–22%
BMI Reference Tables
Standard BMI categories and healthy weight ranges by height.
BMI Categories (Adults)
Underweight
Below 18.5
Normal weight
18.5 – 24.9
Overweight
25.0 – 29.9
Obese Class I
30.0 – 34.9
Obese Class II
35.0 – 39.9
Obese Class III
40.0 and above
Healthy Weight by Height (Imperial)
5'0" (152 cm)
97–123 lbs
5'3" (160 cm)
107–135 lbs
5'6" (168 cm)
118–148 lbs
5'9" (175 cm)
128–162 lbs
6'0" (183 cm)
140–177 lbs
6'3" (191 cm)
152–192 lbs
BMI FAQs
Common questions about Body Mass Index and what it means for your health.
BMI (Body Mass Index) is a measure of body fat based on height and weight. The formula is: BMI = weight(kg) / height(m)². In imperial units: BMI = (weight in lbs × 703) / height in inches². It was developed in the 1830s by Adolphe Quetelet and is widely used as a quick screening tool for weight categories that may lead to health problems.
BMI is a useful screening tool but has significant limitations. It doesn't directly measure body fat and doesn't account for muscle mass (athletes may have a high BMI but low body fat), bone density, age, sex, or ethnic differences in body composition. A person can have a "normal" BMI but still have metabolic health issues. Always use BMI alongside other health metrics like waist circumference, blood pressure, and blood tests for a complete picture.
For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, optimal BMI may vary by age and ethnicity. For example, Asian populations may face higher health risks at lower BMI thresholds (some organizations recommend 18.5–22.9 as normal for Asian adults). After age 65, a slightly higher BMI (up to 27) may actually be protective against bone density loss and frailty.
Safe, sustainable weight loss is typically 0.5–1 kg (1–2 lbs) per week, achieved through a calorie deficit of 500–750 calories per day. This combines reduced calorie intake (primarily) with increased physical activity. The CDC and NHS recommend at least 150 minutes of moderate aerobic activity per week. Crash diets or extreme restriction rarely lead to lasting results and can harm metabolic health. Always consult a doctor or registered dietitian before starting a weight loss program.