BMI Chart for Adults: Healthy Weight Ranges Explained

Introduction

A BMI chart for adults helps you compare your BMI with standard weight categories, based on your height and weight. For adults, the healthy-weight range on the chart is a BMI of 18.5 to 24.9, while 25.0 to 29.9 is classed as overweight and 30.0 or above as obesity.

This guide gives you the full adult BMI chart, explains how to read it, covers common questions such as BMI for men and women and BMI by age, and shows why a BMI category is a screening reference rather than a verdict on your health.

What Is a BMI Chart?

A BMI chart is a reference table that turns a BMI number into a weight-status category. BMI itself is calculated as weight in kilograms divided by height in meters squared, so the chart is really describing the relationship between your weight and your height.

Once you have your BMI, you look for it on the chart to see whether it falls in the underweight, healthy weight, overweight, or obesity category. Charts for adults use fixed cutoff points, which makes them quick and easy to use. If you want to learn what BMI means in more detail, read our guide What Is BMI? BMI Meaning, Formula & Categories Explained.

Adult BMI Chart

The table below shows the standard adult BMI categories used by the CDC, with obesity divided into three classes.

The CDC defines underweight as below 18.5, healthy weight as 18.5 to below 25, overweight as 25 to below 30, and obesity as 30 or higher. The World Health Organization uses broadly the same thresholds for adults: 18.5 to 24.9 as the normal-weight range, 25 and above as overweight, and 30 and above as obesity.

What Is a Healthy BMI Range for Adults?

The standard healthy BMI range for adults is 18.5 to 24.9. A BMI in this range falls within the standard healthy-weight category, but BMI is only one screening measure and does not provide a complete assessment of individual health.

That wording matters. A BMI of 22 does not mean you are definitely healthy, and a BMI of 26 does not mean you are definitely unhealthy. The CDC states that BMI should be considered alongside other health factors, such as medical history, lifestyle, and clinical measurements. You can estimate your own range with the Ideal Weight Calculator.

BMI Chart for Men and Women

For the standard adult BMI categories, the same BMI ranges are used for adult men and women. There is no separate men’s chart and women’s chart, so the table above applies to both.

This does not mean BMI provides identical information about body composition for every individual. Men and women, on average, differ in how body fat and muscle are distributed, and individuals differ a lot within each group. It is one reason BMI should not be interpreted in isolation.

BMI Chart by Age for Adults

People often search for a BMI chart by age, expecting different ranges for 20-year-olds, 40-year-olds, or adults over 50. For standard adult BMI classification, this is not how the categories work. Adults aged 20 and older use the same adult categories rather than separate cutoffs for each age group. The CDC states that adult BMI categories are based on BMI regardless of age, sex, or race.

So a 25-year-old and a 65-year-old with the same BMI fall into the same category on the chart. Age can still matter when interpreting the result, since body composition and health risks change over time, but that is something to discuss with a healthcare professional rather than something the chart itself adjusts for.

Children and Teenagers Are Different

The adult chart should not be used for children and teenagers. For ages 2 to 19, BMI is interpreted using age- and sex-specific percentiles, because young people are still growing and their body composition changes rapidly.

BMI Categories Explained

Underweight: Below 18.5

A BMI below 18.5 is classed as underweight. This category simply describes weight relative to height. BMI alone cannot tell you why someone’s weight is low or whether it causes any health problems, so it is best treated as a prompt for a conversation with a healthcare professional if you are concerned.

Healthy Weight: 18.5 to 24.9

This is the standard healthy-weight BMI range for adults. It is the category most often used as a reference point, though it remains a screening range rather than a guarantee of health.

Overweight: 25.0 to 29.9

A BMI from 25.0 to 29.9 is classed as overweight. Because BMI cannot distinguish muscle from fat, some muscular people fall into this category without carrying excess body fat.

Obesity: 30 or Higher

A BMI of 30 or above is classed as obesity. The CDC further divides adult obesity into three classes:

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

Like every other category, this is a screening classification, not a diagnosis of any specific condition.

How to Read a BMI Chart

Step 1: Calculate Your BMI

Use the BMI Calculator, or apply the formula yourself: weight (kg) ÷ height (m)², or weight (lb) ÷ height (in)² × 703.

Step 2: Find Your BMI Number on the Chart

Look at the BMI range column of the adult chart and find the range that contains your number.

Step 3: Identify the Corresponding Category

Read across to see whether you fall into underweight, healthy weight, overweight, or an obesity class.

Step 4: Consider BMI Alongside Other Health Information

Think about your waist measurement, fitness level, eating habits, blood pressure, and other health information available to you.

Step 5: Use Your Result as a Screening Reference

Treat your category as a reference point, not a diagnosis or a final judgment on your health.

BMI Chart Example

This is an educational example, not a personalized health assessment.

• Height: 5 ft 9 in (69 inches)
• Weight: 160 lb
• BMI = 160 ÷ (69 × 69) × 703 ≈ 23.6

A BMI of about 23.6 falls in the 18.5 to 24.9 range, which is the healthy-weight category on the adult chart.

BMI Chart in Metric Units

Since BMI is calculated from kilograms and meters, the metric version is straightforward.

• Height: 175 cm (1.75 m)
• Weight: 70 kg
• BMI = 70 ÷ (1.75 × 1.75) ≈ 22.9

A BMI of about 22.9 also falls in the healthy-weight category. Whether you use metric or imperial units, the same BMI ranges and categories apply. The result is what matters, not the unit system.

Does a Healthy BMI Mean You Are Healthy?

Not necessarily. BMI is a screening measure, and a number in the healthy range does not confirm good health. BMI does not directly tell you about:

• Body-fat distribution
• Muscle mass
• Fitness level
• Diet quality
• Blood pressure
• Blood glucose
• Cholesterol
• Overall health

The CDC says BMI should be considered together with other factors when assessing health. In the same way, a BMI outside the healthy range does not automatically mean poor health. It is a reason to look at the bigger picture, ideally with a healthcare professional.

Limitations of the BMI Chart

• It doesn’t directly measure body fat. BMI uses only height and weight.
• It doesn’t show where body fat is stored. Fat carried around the abdomen can carry different implications than fat elsewhere.
• Muscular people can have a higher BMI. Athletes and people with more muscle mass may be classed as overweight without excess body fat.
• It doesn’t account for every individual health factor. Genetics, medical conditions, and lifestyle all matter.
• Pregnancy requires different considerations. The standard adult chart is not designed for use during pregnancy.
• Children and teenagers should not use adult categories. They need age- and sex-specific percentiles.

NHLBI also describes BMI as a screening tool, and notes that waist circumference can provide additional information about health risk.

BMI vs. Healthy Weight

A BMI category is not the same as an exact ideal weight. Because BMI depends on height, the healthy-weight range looks different for people of different heights. The table below shows the weights that correspond to a BMI of 18.5 to 24.9 at several example heights.

These ranges are calculated directly from the BMI formula and rounded. They show the weights that fall within the healthy-weight BMI category for each height, not a personal target. Your own healthy weight also depends on your build, muscle mass, and overall health. To estimate a range for your own height, try the Ideal Weight Calculator.

What Should You Do After Checking Your BMI?

Your BMI is a starting point. Depending on what you want to do next, these tools and guides can help:

• Check or recheck your BMI: Use the BMI Calculator.
• Find your daily calorie needs: Use the Calorie Calculator, and read How Many Calories Should I Eat a Day? Complete Guide.
• Working on weight loss: Read What Is a Calorie Deficit? Complete Beginner Guide and How Many Calories Should I Eat to Lose Weight?.
• Getting started with exercise: Try our Beginner Home Workout: Simple Full-Body Routine.
• Planning your nutrition: Use the Protein Calculator.

Frequently Asked Questions

What is a healthy BMI for adults?

For adults, a BMI from 18.5 to 24.9 falls within the standard healthy-weight category. It is a screening range and should be considered alongside other health information.

What is a normal BMI range?

A normal or healthy BMI range for adults is 18.5 to 24.9. The World Health Organization and the CDC use broadly the same range.

What BMI is considered overweight?

For adults, a BMI from 25.0 to 29.9 is classed as overweight.

What BMI is considered obesity?

A BMI of 30.0 or higher is classed as obesity for adults, which the CDC divides into Class 1 (30.0–34.9), Class 2 (35.0–39.9), and Class 3 (40.0 and above).

Does BMI change with age?

Your BMI number can change as your weight changes, but the standard adult categories do not change with age. Adults aged 20 and older use the same cutoffs, regardless of age.

Is the BMI chart the same for men and women?

Yes. The standard adult BMI categories use the same ranges for men and women, although body composition can differ between individuals.

How do I read an adult BMI chart?

Calculate your BMI, find the range on the chart that contains your number, and read the category next to it. Then treat the result as a screening reference and consider it alongside other health information.

Does BMI measure body fat?

Not directly. BMI is calculated from height and weight only, so it cannot tell fat mass from muscle mass, although it is associated with more direct measures of body fatness.

Is BMI an accurate measure of health?

BMI is a useful screening measure, but it is not a complete measure of health. It does not show body-fat distribution, muscle mass, fitness, diet quality, or measures such as blood pressure and cholesterol.

What is the healthy BMI range for adults over 50?

The standard adult healthy BMI range of 18.5 to 24.9 is the same for adults over 50, since the adult categories are not separated by age. If you have questions about what your BMI means at your age, a healthcare professional can help interpret it in context.

Conclusion

The adult BMI chart uses the same simple categories for everyone aged 20 and over: underweight below 18.5, healthy weight from 18.5 to 24.9, overweight from 25.0 to 29.9, and obesity from 30.0, with obesity divided into three classes. There is no separate chart for men and women, and no separate cutoffs by age for adults.

The chart is most useful as a quick screening reference. It works best when you consider it alongside other health information, and it should not be treated as a diagnosis or a complete picture of your health.