BMI Calculator
Enter your height and weight to estimate your Body Mass Index (BMI) and category.
BMI is a screening tool, not a diagnosis. Consider speaking with a healthcare professional for a full assessment.
What is BMI and why use it?
Body Mass Index (BMI) is a simple number calculated from your height and weight. It helps estimate whether your body weight is in a range generally associated with lower or higher health risk. Because it is quick and easy to calculate, BMI is often used in clinics, fitness programs, and public health studies.
While BMI is useful for a broad screening view, it does not directly measure body fat, muscle mass, bone density, or fat distribution. Think of it as a starting point, not a final verdict on health.
How to use this BMI weight calculator
- Select your preferred unit system: metric or imperial.
- Enter your height and current body weight.
- Click Calculate BMI to see your BMI number and category.
- Review the healthy weight range shown for your height.
BMI category reference
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 to 24.9 | Normal weight |
| 25.0 to 29.9 | Overweight |
| 30.0 and above | Obesity |
Interpreting your result responsibly
A BMI value can be helpful, but context matters. Two people can share the same BMI and have very different health profiles depending on activity level, sleep quality, blood pressure, waist circumference, and metabolic markers.
Important limitations
- Highly muscular individuals may have a high BMI without excess body fat.
- Older adults may have normal BMI but lower muscle mass.
- BMI does not account for differences in ethnicity, age, or fat distribution.
- Pregnant individuals should use specialized guidance rather than standard BMI cutoffs.
Practical next steps after calculating BMI
Use your BMI result as a checkpoint. If your number falls outside the normal range, small and steady habits are usually more sustainable than extreme changes.
Habits that support healthy weight management
- Prioritize whole foods: vegetables, fruits, legumes, lean proteins, and whole grains.
- Strength train at least 2 times per week to preserve or build muscle.
- Accumulate daily movement: walking, stairs, and active breaks.
- Sleep 7-9 hours per night to support appetite and recovery.
- Track progress trends over weeks, not day-to-day fluctuations.
Frequently asked questions
Is BMI accurate?
It is accurate as a mathematical index and useful for population-level screening. For individual health decisions, pair BMI with other measures such as waist circumference, body composition, blood work, and professional advice.
What is a healthy BMI for adults?
In most guidelines, a BMI between 18.5 and 24.9 is considered the normal range for adults. However, your best target should reflect your medical history and clinician recommendations.
Should I aim for a specific weight?
A target range is often better than a single number. Sustainable habits, improved energy, better labs, and consistent strength are all signs of progress, even before major scale changes.