Healthy Weight Calculator

Use this healthy weight calculator to estimate your body mass index (BMI) and see where your weight falls within the standard healthy weight range. Enter your height and weight above, and the calculator returns your BMI along with the category it falls into.

BMI is a screening tool, not a diagnosis. It gives you a quick estimate based on your height and weight. For a full picture of your health, factors like body fat, muscle mass, age, and physical activity all matter. This calculator is a starting point, not a replacement for guidance from a health care provider.

Calculate Your BMI With Your Height and Weight

The calculator above needs just two inputs: your height and your weight. Enter your height in feet and inches (or centimeters) and your weight in pounds (or kilograms). The tool does the math instantly and shows your BMI score with the matching category.

Most adults can use BMI to get a general sense of whether their weight is in a healthy range. A BMI between 18.5 and 24.9 is considered healthy for most adults. Below 18.5 is underweight, and 25 or above moves into the overweight range.

Keep in mind that BMI is a ratio. It does not directly measure body fat or account for where fat is distributed.

What Is Body Mass Index?

Body mass index is a number calculated from your weight and height. It was developed as a simple way to categorize weight status across large populations. Health organizations like the CDC (Centers for Disease Control and Prevention) use it as a screening tool to flag potential health risks related to excess weight or being underweight.

BMI does not measure total body fat. It does not distinguish between fat, muscle, or bone density. Two people with the same BMI can have very different body compositions.

Think of BMI as a general guideline. It works well for quick assessments but tells an incomplete story on its own.

How the BMI Calculator Works

BMI Calculator Formula

The standard BMI formula depends on the unit system you use.

Imperial (pounds and inches):

BMI = (weight in pounds × 703) ÷ (height in inches × height in inches)

Metric (kilograms and meters):

BMI = weight in kilograms ÷ (height in meters × height in meters)

For example, someone who is 5 feet 10 inches tall and weighs 160 pounds:

1. Convert height to inches: 70 inches
2. Square the height: 70 × 70 = 4,900
3. Multiply weight by 703: 160 × 703 = 112,480
4. Divide: 112,480 ÷ 4,900 = 22.95

A BMI of about 23.0 falls in the healthy weight range.

Ideal Body Weight vs. Body Mass Index

These two concepts overlap but are not the same thing.

• BMI places your current weight into a category (underweight, healthy, overweight, obese) based purely on your height and weight ratio.
• Ideal body weight estimates a target weight for your height, often using clinical formulas like the Devine formula.

BMI tells you where you are. Ideal body weight suggests where you might aim. Neither accounts for muscle mass, body fat distribution, or individual health conditions.

Healthy Weight Range: What Your BMI Means

The standard BMI categories for adults, as defined by the CDC and the World Health Organization, are:

These ranges apply to males and females ages 20 and older. They are population averages. Individual context matters a great deal.

Underweight, Overweight, and Obesity

Underweight (below 18.5): May signal nutritional deficiency, an underlying health condition, or insufficient caloric intake. Being significantly underweight is associated with weakened immunity, bone loss, and other health problems.

Overweight (25.0 to 29.9): A higher BMI in this range can indicate excess weight that may increase health risk over time. However, someone with significant muscle mass could land here and be perfectly healthy.

Obesity (30.0 and above): Generally associated with elevated risk for chronic conditions. Obesity is further divided into classes:

• Class 1: BMI 30.0 to 34.9
• Class 2: BMI 35.0 to 39.9
• Class 3: BMI 40.0 and above

Health Risk by BMI Category

Research links higher BMI categories to increased risk for several conditions:

• Heart disease
• Type 2 diabetes
• High blood pressure
• High cholesterol
• Certain cancers
• Sleep apnea
• Joint problems

Being underweight also carries health risks, including osteoporosis, anemia, and fertility issues. A BMI in the healthy range (18.5 to 24.9) is generally associated with lower risk, but BMI alone cannot assess your current health status.

Ideal Weight Calculator by Height and Weight

The calculator on this page also provides an ideal body weight estimate based on your height. Here are approximate healthy weight ranges for several common heights:

These ranges correspond to a BMI of roughly 18.5 to 24.9. Your ideal weight within that range depends on your frame, body composition, age, and activity levels.

For a specific number, the Devine formula is one of the most widely used ideal body weight formulas in clinical settings. It estimates ideal body weight based on height alone, with different baselines for males and females. It was originally designed for medication dosing, so it has practical limits as a fitness or wellness target.

Body Fat and Muscle Mass: Where BMI Falls Short

Body Fat vs. Body Mass Index

BMI is not a direct measure of body fat. It cannot tell you how much of your weight comes from fat versus lean tissue. Two people at the same height and weight will share the same BMI, even if one has much more body fat than the other.

More accurate ways to estimate total body fat include:

• Waist circumference: Measures fat distribution around the midsection, which correlates with health risk
• Skinfold measurements: A trained professional uses calipers at specific body sites
• DEXA scans: Dual-energy X-ray absorptiometry gives detailed body composition data
• Bioelectrical impedance: Estimates fat percentage using electrical signals

Waist size is especially useful. Fat stored around the abdomen (visceral fat) carries a higher risk for heart disease and type 2 diabetes than fat stored elsewhere.

Why Muscle Mass Affects Your BMI

Muscle is denser than fat. A person with significant muscle mass can have a high BMI without carrying excess body fat. This is common among athletes, weightlifters, and people with physically demanding jobs.

If your BMI falls in the overweight category but you are lean and physically active, the number may not reflect your actual health risk. Body composition measurements give a more complete picture.

On the other hand, some people with a "normal" BMI may still carry a high percentage of body fat. This is sometimes called "normal weight obesity." It is more common in older adults or people who are sedentary.

BMI for Children and Adolescents

This calculator is designed for adults. BMI for children and teens (ages 2 through 19) is calculated the same way but interpreted differently.

For children and teens, BMI is plotted on growth charts that account for age and sex. The result is expressed as a percentile rather than a fixed category. A child at the 85th percentile, for example, has a higher BMI than 85% of children of the same age and sex.

The CDC provides separate growth charts for this purpose. If you need to assess weight status for a child or adolescent, a pediatrician or health care provider can help interpret the results properly.

Calculate Your Ideal Body Weight

Ideal Body Weight Formulas

Several clinical formulas estimate ideal body weight. The most common ones use height as the primary input.

Devine Formula (1974):

• Males: 110 lbs + 5.06 lbs for each inch over 5 feet
• Females: 100 lbs + 5.06 lbs for each inch over 5 feet

Robinson Formula (1983):

• Males: 115.7 lbs + 4.6 lbs for each inch over 5 feet
• Females: 108.4 lbs + 4.2 lbs for each inch over 5 feet

Miller Formula (1983):

• Males: 123.9 lbs + 3.1 lbs for each inch over 5 feet
• Females: 116.1 lbs + 2.7 lbs for each inch over 5 feet

These formulas give different results because they were developed from different data sets. None of them factor in body composition, age, or physical activity. Use them as estimates, not fixed targets.

The calculator on this page uses a range based approach so you can see the full span of healthy weights for your height rather than a single number.

Using This Weight Calculator to Assess Health Risk

BMI is one piece of the puzzle. It works best as a starting point for understanding potential health risks related to your weight. Pair it with other information for a more complete picture.

Heart Disease, Type 2 Diabetes, and Obesity

Higher BMI is associated with increased risk for heart disease, type 2 diabetes, and other chronic conditions. Obesity (BMI 30 and above) is a well-documented risk factor.

However, BMI alone does not account for:

• Fat distribution: Visceral fat (around the organs) raises risk more than subcutaneous fat (under the skin). Waist circumference can help assess this.
• Metabolic health: Blood pressure, blood sugar, and cholesterol levels matter regardless of BMI.
• Family history: Genetic factors influence your risk independently of weight.

Someone with a BMI in the overweight range but healthy blood pressure, blood sugar, and cholesterol may face lower risk than someone with a "normal" BMI and poor metabolic markers.

Physical Activity and Healthy Weight

Regular physical activity improves health outcomes across all weight categories. Exercise supports weight management, lowers the risk of heart disease and type 2 diabetes, strengthens bones, and improves mental health.

Current guidelines recommend:

• At least 150 minutes of moderate aerobic activity per week (like brisk walking)
• Muscle-strengthening activities at least 2 days per week

Physical activity does not have to be intense to matter. Consistent movement at any level is beneficial. If your BMI is outside the healthy range, combining activity with dietary changes is the most effective approach to weight management. A health care provider can help you set realistic goals based on your overall health.

Frequently Asked Questions

What Is a Healthy BMI for Adults?

A healthy BMI for most adults falls between 18.5 and 24.9. This range is associated with the lowest statistical risk for weight-related health conditions. Keep in mind that individual factors like muscle mass, bone density, and age can shift what "healthy" looks like for you personally.

How Do I Calculate My Ideal Weight?

Enter your height and weight into the calculator at the top of this page. It will return your BMI and show where your weight falls within the healthy range for your height. For a formula-based estimate, the Devine formula calculates ideal body weight from height alone, but it does not account for body composition or fitness level.

Is BMI the Same as Body Fat?

No. BMI is a ratio of weight to height. It does not measure body fat directly. A person with high muscle mass can have a high BMI without excess fat. For a more accurate picture of body composition, methods like waist circumference, skinfold measurements, or DEXA scans are better options.

Does This BMI Calculator Work in Metric and Imperial?

Yes. You can enter your height in feet and inches or centimeters, and your weight in pounds or kilograms. The calculator converts the inputs and applies the standard BMI formula either way.

When Should I Talk to a Health Care Provider About My Weight?

Consider reaching out to a healthcare provider if your BMI falls outside the 18.5 to 24.9 range, if you have concerns about unexplained weight changes, or if you have a family history of conditions like heart disease, type 2 diabetes, or obesity. A provider can evaluate your current health status, consider factors this calculator cannot measure, and help you create a personalized plan.