Free BMI Calculator for Men & Women

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Height

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Weight

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Age

yrs

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BMI Score

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Underweight
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+

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Ideal Weight

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Weight Goal

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Daily Calories

Personalized Health Tips

BMI Reference Charts

♂ BMI Chart for Men

BMI Range	Category	Health Risk
Below 18.5	Underweight	Moderate
18.5 – 24.9	Normal Weight	Low
25.0 – 29.9	Overweight	Increased
30.0 – 34.9	Obese Class I	High
35.0 – 39.9	Obese Class II	Very High
40.0+	Obese Class III	Extreme

Ideal BMI for men: 18.5–25.0 | Ideal body fat: 8–19%

♀ BMI Chart for Women

BMI Range	Category	Health Risk
Below 18.5	Underweight	Moderate
18.5 – 24.9	Normal Weight	Low
25.0 – 29.9	Overweight	Increased
30.0 – 34.9	Obese Class I	High
35.0 – 39.9	Obese Class II	Very High
40.0+	Obese Class III	Extreme

Ideal BMI for women: 18.5–24.0 | Ideal body fat: 21–33%

Understanding Your BMI Results

Body Mass Index offers a quick, low-cost way to screen for weight ranges that may be associated with health risk. It does not measure body fat directly, but for most adults it correlates reasonably well with more direct measures of body composition, which is why it remains one of the most widely used screening tools in general health checkups.

Why BMI Is Still Widely Used

BMI only requires height and weight, so it can be calculated instantly, compared across large populations, and tracked over time without special equipment. Health organizations use it as a starting point for a broader conversation about weight, activity level, and overall wellbeing, not as a final verdict on someone's health.

What BMI Does Not Tell You

BMI cannot distinguish between fat mass and muscle mass, so a muscular or very active person may score higher without carrying excess body fat. It also does not show where fat is stored on the body, and it does not account for factors like bone density, age, or ethnicity. For a fuller picture, BMI is best paired with measures such as waist circumference, blood pressure, and routine bloodwork, ideally reviewed with a healthcare provider.

Turning Your Result Into Action

Whatever category your BMI falls into, small and consistent habits tend to matter more than short-term fixes. Below your result, we link to practical guides tailored to your goal, whether that means building healthy weight, maintaining your current range, or working toward gradual, sustainable weight loss.

Frequently Asked Questions About BMI

What is BMI and how is it calculated?

BMI (Body Mass Index) is a simple numerical measure of a person's body weight in relation to their height. It is calculated by dividing your weight in kilograms by the square of your height in meters: BMI = weight(kg) / height(m)². It serves as a screening tool — not a diagnostic measure — for weight categories such as underweight, normal, overweight, and obese.

Is a healthy BMI different for men and women?

The standard BMI scale (18.5–24.9 = normal) applies to both men and women. However, women naturally carry more body fat than men at the same BMI. For instance, a BMI of 22 in a woman includes more fat mass than in a man of the same BMI. Some researchers suggest women's optimal BMI may be slightly lower (18.5–24.0). Age also plays a role — older adults may have a slightly higher acceptable BMI (up to 27) due to muscle mass changes.

What are the limitations of BMI?

BMI does not distinguish between fat and muscle mass, so athletes or muscular individuals may be classified as overweight even when healthy. It also does not account for fat distribution (where fat is stored), bone density, ethnicity differences, or age-related changes. BMI is best used alongside other health metrics like waist circumference, body fat percentage, blood pressure, and cholesterol levels for a complete picture of health.

What is the ideal BMI for a woman?

For women, a BMI between 18.5 and 24.9 is considered normal and healthy. Some health organizations suggest that women aim for 18.5–24.0 for optimal health outcomes. Women over 65 may benefit from a slightly higher BMI (up to 27) to protect bone density and reduce frailty risk. It's always best to consult your doctor for personalized recommendations.

How many calories should I eat based on my BMI?

Calorie needs are based on your Basal Metabolic Rate (BMR) — the calories your body burns at rest — adjusted for your activity level. Our calculator uses the Mifflin-St Jeor equation to estimate your maintenance calories. If you are overweight, a deficit of 300–500 kcal/day is safe. If underweight, a surplus of 250–500 kcal/day is recommended. Always consult a registered dietitian for a personalized nutrition plan.

What is the healthy BMI range for men?

For men, a BMI between 18.5 and 24.9 is classified as healthy and normal weight. Men with a BMI below 18.5 are considered underweight, while those between 25–29.9 are overweight. A BMI of 30 or above indicates obesity. Men tend to carry more visceral (abdominal) fat, which is associated with higher cardiovascular risk, making waist circumference (below 94 cm) an important complementary measure.