OmniCalcsBMI Calculator
Find your body mass index in seconds, see your category and the healthy weight range for your height.
How to Use This BMI Calculator
Enter your height and weight, choose metric or imperial units, and click Calculate. Your BMI appears instantly with its category and a color-coded scale.
- Underweight — below 18.5. Consider speaking with a health professional about healthy ways to gain weight.
- Normal weight — 18.5 to 24.9. This range is associated with the lowest health risk for most adults.
- Overweight — 25 to 29.9. Small lifestyle changes can make a meaningful difference.
- Obese — 30 and above. Talk to a doctor about a personalized plan.
Frequently Asked Questions
What is a healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. Above 25 is overweight and above 30 is obese.
Is BMI accurate for athletes?
Not always. Very muscular people can have a high BMI with low body fat. Use the Body Fat Calculator for a better picture if you train heavily.
Is BMI the same for children?
No. For children and teens, BMI is compared against age-and-sex percentiles. This calculator targets adults.
Is BMI a diagnosis?
No — it is a screening tool. Many other factors matter, including body fat distribution and fitness level. Consult a professional for a full assessment.
Practical Example
Suppose you are 1.75 m tall and weigh 75 kg:
- BMI = 75 ÷ (1.75 × 1.75) = 75 ÷ 3.0625 ≈ 24.5
- This falls in the healthy range (18.5–24.9)
- The healthy weight range for 1.75 m is about 57–76 kg
What Your Results Mean
- Below 18.5 — underweight; consider a diet review with a professional.
- 18.5–24.9 — healthy weight range for most adults.
- 25–29.9 — overweight; small changes in diet and activity help.
- 30 and above — obesity range; a doctor's guidance is recommended.
Learn More
Read our in-depth guide: How to Calculate BMI (and What It Misses) — the formula, healthy ranges and its real limits.