Health
BMI Calculator
Calculate your Body Mass Index instantly. Enter your height and weight in metric or imperial units to find your BMI, see your category, and get your healthy weight range.
Healthy weight range by height
Based on the WHO healthy BMI range of 18.5–24.9 for adults.
| Height | Min weight | Max weight | BMI range |
|---|---|---|---|
| 150 cm / 4′11″ | 41.6 kg / 92 lb | 56.2 kg / 124 lb | 18.5–24.9 |
| 155 cm / 5′1″ | 44.4 kg / 98 lb | 59.9 kg / 132 lb | 18.5–24.9 |
| 160 cm / 5′3″ | 47.4 kg / 104 lb | 63.9 kg / 141 lb | 18.5–24.9 |
| 165 cm / 5′5″ | 50.4 kg / 111 lb | 68 kg / 150 lb | 18.5–24.9 |
| 170 cm / 5′7″ | 53.5 kg / 118 lb | 72.2 kg / 159 lb | 18.5–24.9 |
| 175 cm / 5′9″ | 56.7 kg / 125 lb | 76.5 kg / 169 lb | 18.5–24.9 |
| 180 cm / 5′11″ | 60.1 kg / 132 lb | 81 kg / 179 lb | 18.5–24.9 |
| 185 cm / 6′1″ | 63.4 kg / 140 lb | 85.6 kg / 189 lb | 18.5–24.9 |
| 190 cm / 6′3″ | 66.9 kg / 147 lb | 90.3 kg / 199 lb | 18.5–24.9 |
Ideal BMI by age
While the standard healthy range (18.5–24.9) applies at all ages, some research suggests slightly higher BMI may be optimal as you age.
| Age group | Men (approximate ideal) | Women (approximate ideal) | WHO healthy range |
|---|---|---|---|
| 19–24 | 19–24 | 18–23 | 18.5–24.9 |
| 25–34 | 20–25 | 19–24 | 18.5–24.9 |
| 35–44 | 21–26 | 20–25 | 18.5–24.9 |
| 45–54 | 22–27 | 21–26 | 18.5–24.9 |
| 55–64 | 23–28 | 22–27 | 18.5–24.9 |
| 65+ | 24–29 | 23–28 | 18.5–24.9 |
Approximate ranges based on WHO and NIH guidelines. Individual health needs vary — consult a healthcare provider for personalised advice.
Related health calculators
Ad Space — 90px
Frequently Asked Questions
What is BMI and how is it calculated?
Body Mass Index (BMI) is a measure of body weight relative to height. The formula is: BMI = weight (kg) ÷ height (m)². For example, a person who is 70kg and 1.75m tall has a BMI of 70 ÷ (1.75 × 1.75) = 22.9. In imperial units the formula is: BMI = (weight in lbs ÷ height in inches²) × 703.
What is a healthy BMI range?
For most adults, a BMI between 18.5 and 24.9 is considered healthy by the World Health Organization (WHO). Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese. These thresholds apply to most adults but may not be appropriate for athletes, the elderly, or certain ethnic groups.
What is a healthy BMI for women?
The healthy BMI range for women is the same as for men: 18.5–24.9. However, women naturally have a higher body fat percentage than men at the same BMI. Some research suggests that a BMI of 21–23 may be optimal for women, and BMI thresholds can be slightly lower for women of Asian descent.
What is a healthy BMI for men?
For adult men, a BMI between 18.5 and 24.9 is considered healthy. Men with high muscle mass (such as bodybuilders) may have a BMI above 25 without being overweight — this is a known limitation of BMI as a measurement. For men over 60, a BMI between 24 and 27 may be associated with better health outcomes.
What BMI is considered obese?
A BMI of 30 or above is classified as obese by the WHO. This is further divided into: Class I obesity (BMI 30–34.9), Class II obesity (BMI 35–39.9), and Class III obesity (BMI 40+, also called severe or morbid obesity). Each class carries progressively higher health risks.
What is a good BMI by age?
The standard healthy BMI range (18.5–24.9) applies to adults of all ages. However, older adults (65+) may benefit from a slightly higher BMI (24–27) as a protective buffer against illness and muscle loss. For children and teenagers, BMI is age and sex-specific — use a paediatric BMI calculator instead.
Is BMI accurate for everyone?
BMI is a useful population-level screening tool but has significant limitations as an individual measure. It overestimates body fat in athletes and muscular individuals, underestimates body fat in older adults who have lost muscle mass, and may misclassify people of Asian descent (for whom a lower threshold of 23 is sometimes used). BMI does not account for where fat is distributed in the body.
How can I lower my BMI?
BMI decreases when you lose body fat, which is achieved through a sustained caloric deficit — consuming fewer calories than you burn. The most effective approach combines moderate caloric reduction (300–500 calories per day below maintenance), regular aerobic exercise (walking, running, cycling), and strength training to preserve muscle mass. Crash diets are counterproductive — aim for 0.5–1kg per week of weight loss.