BMI Calculator
Calculate your Body Mass Index with a visual scale showing underweight, normal, overweight, and obese categories.
BMI Calculator tool
Example
Input: Weight 70 kg, height 175 cm (metric)
Result: BMI 22.9 (Normal weight), Healthy Weight Range 56.7 - 76.3 kg
BMI = 70 / 1.75^2 = 22.9, within the 18.5-24.9 healthy range.
Healthy Weight Range by Height (BMI 18.5 to 24.9)
| Height | Feet and Inches | Weight (kg) | Weight (lbs) |
|---|---|---|---|
| 150 cm | 4 ft 11 in | 41.6 - 56.0 | 92 - 124 |
| 155 cm | 5 ft 1 in | 44.4 - 59.8 | 98 - 132 |
| 160 cm | 5 ft 3 in | 47.4 - 63.7 | 104 - 141 |
| 165 cm | 5 ft 5 in | 50.4 - 67.8 | 111 - 149 |
| 170 cm | 5 ft 7 in | 53.5 - 72.0 | 118 - 159 |
| 175 cm | 5 ft 9 in | 56.7 - 76.3 | 125 - 168 |
| 180 cm | 5 ft 11 in | 59.9 - 80.7 | 132 - 178 |
| 185 cm | 6 ft 1 in | 63.3 - 85.2 | 140 - 188 |
| 190 cm | 6 ft 3 in | 66.8 - 89.9 | 147 - 198 |
Adult ranges using the same 18.5 and 24.9 cut-offs as the calculator.
- Select metric (kg/cm) or imperial (lbs/ft-in) units.
- Enter your body weight in the chosen unit.
- Enter your height in centimeters or feet and inches.
- View your BMI score and its category on the visual scale.
- Read the health guidance for your BMI range.
What Your BMI Means and Where It Falls Short
BMI (body mass index) compares your weight with your height. It is a quick screening number, not a diagnosis. A BMI from 18.5 to 24.9 is considered a healthy weight for most adults. This calculator works it out in metric or imperial units and shows where you fall on the scale.
The formula is weight in kilograms divided by height in meters squared. At 70 kg and 175 cm, that is 70 / (1.75 x 1.75) = 22.9. The tool also gives the weight range that would put you between 18.5 and 24.9 at your height. The table below lists that range for common heights.
The four adult categories are underweight (below 18.5), healthy weight (18.5 to 24.9), overweight (25 to 29.9) and obesity (30 or more). These match the ranges used by the CDC and the WHO. They apply to adults aged 20 and over. Children and teens are assessed with age- and sex-specific growth charts instead.
BMI has real limits. It cannot tell muscle from fat, so strong, muscular people can score as overweight while carrying little fat. It also says nothing about where fat sits, and fat around the waist carries more health risk. Some health bodies use lower cut-offs for people of Asian descent. The same BMI can mean different things for an older adult and a young athlete.
Use your BMI as a starting point for a conversation, not a verdict. A doctor can combine it with waist size, blood pressure, blood tests and your history. For a closer look at body composition, try the Body Fat Percentage Calculator.
Formula / How It Works
Sources
Frequently Asked Questions
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