BMI Calculator — Body Mass Index, Category & Healthy Range
Calculate your Body Mass Index (BMI) from height and weight. See your BMI category, healthy weight range, and what it means. Free, instant results with chart.
By Konstantin Iakovlev · Updated September 2026 · Source: CDC — Adult BMI Categories
Your BMI
24.4
Normal
BMI Prime
0.98
Healthy Weight Range
129 lbs - 174 lbs
BMI Categories
| Underweight | < 18.5 |
| Normal weight | 18.5 - 24.9 |
| Overweight | 25.0 - 29.9 |
| Obese | 30.0+ |
Medical disclaimer: BMI is a screening tool based on the formula defined by the World Health Organization (WHO) and used by the CDC. It does not directly measure body fat and may not be accurate for athletes, elderly individuals, pregnant women, or those with high muscle mass.
BMI should not be used as a diagnostic tool. Consult a qualified healthcare provider for a complete health assessment including body composition, waist circumference, and metabolic health markers.
Use the BMI Calculator — Body Mass Index, Category & Healthy Range above to calculate your results. Enter your values and see instant results — all calculations run in your browser.
Disclaimer: This calculator is for informational purposes only and is not medical advice. Results are estimates from standard formulas and the numbers you enter. Talk to a doctor or another qualified health professional about your own health before acting on them.
How It Works
Body Mass Index gives you a fast read on where your weight sits relative to your height, and it's usually the first number clinicians reach for when they start screening for weight-related health risk. The result here returns your BMI, the category it falls into, the healthy weight range for your height, and a plain explanation of what those numbers signal.
The metric calculation is direct: weight in kilograms divided by the square of height in meters (BMI = kg/m²). Working in imperial units, you take weight in pounds divided by the square of height in inches and multiply by 703 (BMI = (lbs / in²) * 703). Either way, the result is a standardized, population-level measure of weight against height that flags potential risk quickly.
What BMI cannot do is measure body fat directly or distinguish muscle, bone density, and overall composition. A very muscular person can post a high BMI without carrying excess fat, while someone with little muscle may land in the 'healthy' band yet have an unhealthy body fat percentage. Read it as one screening input among several, and lean on a healthcare professional for a full picture of your health.
Example: Sarah's BMI Calculation
- 1 Sarah, a 30-year-old, is 5 feet 5 inches (1.65 meters) tall and weighs 140 pounds (63.5 kilograms).
- 2 Using the metric formula: BMI = 63.5 kg / (1.65 m * 1.65 m) = 63.5 / 2.7225 = 23.32. Using the imperial formula: BMI = (140 lbs / (65 in * 65 in)) * 703 = (140 / 4225) * 703 = 0.033136 * 703 = 23.29.
- 3 Sarah's calculated BMI is approximately 23.3.
- 4 Based on her BMI of 23.3, Sarah falls into the 'Normal weight' category (18.5 - 24.9). Her healthy weight range at 5'5" is 111 to 150 lbs: the calculator multiplies BMI 18.5 and 24.9 by her height squared (1.651 m × 1.651 m = 2.7258 m²), giving 50.4 kg and 67.9 kg. In metric mode with a height of 165 cm it shows 50.4 to 67.8 kg.
Source: CDC — Adult BMI Categories · Last updated: September 2026
Frequently Asked Questions
What is a healthy BMI range?
Is BMI accurate for muscular people?
How is BMI calculated?
You might also need
HSA Calculator 2026 — Contribution Limits & Triple Tax Savings
Calculate HSA tax savings, investment growth, and projected balance at retirement. See the triple tax advantage in action. Based on 2026 IRS contribution limits.
Calorie Calculator (TDEE)
Calculate daily calories for maintenance, weight loss, or gain using the Mifflin-St Jeor equation and your activity level.
Sleep Calculator
Find the best bedtime or wake-up time based on 90-minute sleep cycles for optimal rest.