Free Online Calculators
Calculate Body Mass Index online
This calculator finds your Body Mass Index (BMI) using your height and weight. The formula is simple: BMI = weight (kg) ÷ height (m)². Your result is then compared against standard BMI categories so you know where you stand.
At a height of 69 inches (5′9″) and a weight of 160 lb, the BMI is 23.6, which is in the normal range. The BMI chart below covers heights from 4′10″ to 6′4″ and weights from 100 to 280 lb: under 18.5 is underweight, 18.5 to 24.9 normal, 25 to 29.9 overweight and 30 or more obese.
| Height \ Weight | 100 lb | 120 lb | 140 lb | 160 lb | 180 lb | 200 lb | 220 lb | 240 lb | 260 lb | 280 lb |
|---|---|---|---|---|---|---|---|---|---|---|
| 4′10″ | 20.9 | 25.1 | 29.3 | 33.4 | 37.6 | 41.8 | 46.0 | 50.2 | 54.3 | 58.5 |
| 5′0″ | 19.5 | 23.4 | 27.3 | 31.2 | 35.2 | 39.1 | 43.0 | 46.9 | 50.8 | 54.7 |
| 5′2″ | 18.3 | 21.9 | 25.6 | 29.3 | 32.9 | 36.6 | 40.2 | 43.9 | 47.5 | 51.2 |
| 5′4″ | 17.2 | 20.6 | 24.0 | 27.5 | 30.9 | 34.3 | 37.8 | 41.2 | 44.6 | 48.1 |
| 5′6″ | 16.1 | 19.4 | 22.6 | 25.8 | 29.0 | 32.3 | 35.5 | 38.7 | 42.0 | 45.2 |
| 5′8″ | 15.2 | 18.2 | 21.3 | 24.3 | 27.4 | 30.4 | 33.4 | 36.5 | 39.5 | 42.6 |
| 5′9″ | 14.8 | 17.7 | 20.7 | 23.6 | 26.6 | 29.5 | 32.5 | 35.4 | 38.4 | 41.3 |
| 5′10″ | 14.3 | 17.2 | 20.1 | 23.0 | 25.8 | 28.7 | 31.6 | 34.4 | 37.3 | 40.2 |
| 6′0″ | 13.6 | 16.3 | 19.0 | 21.7 | 24.4 | 27.1 | 29.8 | 32.5 | 35.3 | 38.0 |
| 6′2″ | 12.8 | 15.4 | 18.0 | 20.5 | 23.1 | 25.7 | 28.2 | 30.8 | 33.4 | 35.9 |
| 6′4″ | 12.2 | 14.6 | 17.0 | 19.5 | 21.9 | 24.3 | 26.8 | 29.2 | 31.6 | 34.1 |
Divide your weight in kilograms by your height in meters squared. At 70 kg and 1.75 m the BMI is 70 ÷ (1.75 × 1.75) = 22.9.
Multiply your weight in pounds by 703 and divide by your height in inches squared. At 160 lb and 5 ft 9 in (69 inches) the BMI is 703 × 160 ÷ (69 × 69) = 23.6. The calculator accepts pounds, feet and inches directly; switch to metric for kilograms and centimeters.
BMI does not distinguish muscle from fat or show where fat is stored. Muscular athletes can land in the overweight range, and older adults can have a normal BMI with little muscle. Waist circumference adds useful information.
Your Body Mass Index (BMI) is one of the most widely used screening tools to assess whether your weight is in a healthy range for your height. Whether you're tracking your fitness journey, managing your health, or just curious about where you stand, our free online BMI Calculator gives you fast, accurate results in seconds.
BMI stands for Body Mass Index, a numerical value calculated from your height and weight. It's used by healthcare professionals worldwide as a quick way to categorize individuals into weight status groups. While it doesn't directly measure body fat, it correlates well with more direct measures of body composition and health risks.
The formula is straightforward:
Once you calculate your BMI, the result falls into one of the following categories defined by the World Health Organization (WHO):
Monitoring your BMI over time is a simple, no-cost way to stay aware of your overall health trajectory. Here's why it matters:
Using our BMI calculator couldn't be simpler. Just follow these steps:
No sign-up required. No personal data stored. Just quick, reliable results whenever you need them.
While BMI is a useful general indicator, it's important to understand what it doesn't capture:
Always consult a qualified healthcare provider before making major changes to your diet or exercise routine based on your BMI result.
If your BMI falls outside the healthy range, here are some practical steps to help bring it back into balance:
BMI is a useful screening tool but not a definitive measure of health. It doesn't differentiate between muscle and fat or account for fat distribution. It's best used alongside other health assessments like waist circumference, blood pressure, and cholesterol levels.
For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, this range may vary slightly based on age, sex, and ethnicity. Consult your doctor for personalized guidance.
This calculator is designed for adults aged 18 and older. For children and teenagers, BMI is interpreted differently using age- and sex-specific growth charts. A pediatrician should be consulted for accurate assessment of a child's BMI.
There's no strict rule, but checking your BMI every few months is reasonable if you're actively working on your weight or health goals. For most people, an annual check during a routine health visit is sufficient.
The BMI formula is the same for both men and women, but body fat percentage at the same BMI tends to differ between sexes. Women generally have a higher percentage of body fat than men at the same BMI. Some experts suggest using additional measurements for a more complete picture of health.