What is a healthy BMI for women?

WHO defines healthy BMI as 18.5–24.9 for adult women. For Asian women, many health bodies recommend an upper threshold of 23 due to higher metabolic risk at lower BMI values than Western populations.

What is a good BMI by age?

For adults under 65: healthy BMI is 18.5–24.9. For adults 65+: many geriatric guidelines accept 22–27 as protective against falls and illness. For children, BMI uses age- and sex-specific percentile charts, not fixed thresholds.

Can you have a normal BMI but still be unhealthy?

Yes — this is called normal weight obesity. A person can have BMI 18.5–24.9 but carry excess visceral fat with little muscle. Waist circumference above 80cm for women or 94cm for men signals elevated metabolic risk regardless of BMI.

Is BMI accurate for athletes?

No. BMI cannot distinguish muscle from fat. Muscular athletes frequently register as overweight or obese despite very low body fat. Body fat percentage measurement is more accurate for muscular individuals.

What BMI is classified as obese?

BMI 30+ is obese by WHO classification: Class I (30–34.9), Class II (35–39.9), Class III or severe obesity (40+). For Asian populations, obesity is often defined from BMI 27.5 due to higher health risks at lower thresholds.

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BMI Calculator

Height

Weight (kg)

Healthy Range

BMI Prime

Use this when: you want to check your weight-health category using feet/inches or cm/kg. For metric-only input (kg and cm), use the BMI Calculator (kg & cm). For actual body fat measurement, use the Body Fat Calculator.

No sign-up required · Runs entirely in your browser · Your data is never stored

Weight & fitness — use the right tool: BMI Calculator = weight/height ratio · BMI (kg/cm) = metric inputs only · Body Fat Calculator = actual fat percentage · Ideal Weight = target weight range

Medically reviewed by Dr. P Nair, MBBS, MD (Community Medicine) · Author: Mayra

✓ Last reviewed: June 2026 · Methodology

BMI = weight (kg) ÷ height² (m²). WHO classification: Underweight <18.5, Normal 18.5–24.9, Overweight 25–29.9, Obese ≥30. For South Asian populations, the Indian consensus uses adjusted thresholds: overweight at 23, obese at 27.5, due to higher cardiometabolic risk at lower BMI values.

Body Mass Index with visual health gauge

📜 WHO & ICMR source for BMI ranges

BMI = weight (kg) ÷ height (m)². Category thresholds follow the WHO classification (underweight <18.5, normal 18.5–24.9, overweight 25–29.9, obese ≥30) and the lower Asian-Indian cut-offs (overweight ≥23, obese ≥25) recommended by ICMR consensus guidelines for Indian populations. Last reviewed: June 2026.

📊 Methodology: This calculator uses validated clinical formulas as cited in the sources below. Results are estimates for general informational purposes. Consult a qualified healthcare professional before making health decisions.

Last updated: May 2026

BMI scale with WHO categories and the lower Asian-Indian cut-offs used by ICMR

What is BMI?

Body Mass Index (BMI) is a measurement using height and weight to estimate whether you are at a healthy weight. It is calculated by dividing weight in kilograms by height in meters squared. Use the blood pressure calculator for related calculations. Need to continue this calculation? Try the BMI Calculator kg cm or the Body Fat Calculator.

BMI Categories

BMI Range	Category
Below 18.5	Underweight
18.5 - 24.9	Normal weight
25.0 - 29.9	Overweight
30.0+	Obese

Limitations

BMI does not distinguish between muscle and fat mass and may not be accurate for athletes, elderly individuals, or pregnant women. Consult a healthcare professional for a complete assessment.

Important health note

This calculator is for general information and self-checking only. It should not be used as a diagnosis, treatment plan, or replacement for advice from a qualified doctor, dietitian, trainer, or other healthcare professional. If you are pregnant, managing a medical condition, taking medication, recovering from illness, or making a major diet or exercise change, please speak with a professional before acting on the result.

A better way to read your BMI result

BMI is useful as a quick screening number, but it should not be treated as a full health report. Muscle mass, body composition, age, pregnancy, and medical conditions can all change how the result should be interpreted. Use it as a starting point, then compare it with waist measurement, daily activity, and advice from a qualified health professional when needed.

How does this calculator help in real situations?

The BMI Calculator is built for people who want a fast answer without losing context. It keeps the calculation simple, shows the result clearly, and helps you understand what the number means before you use it in a real decision.

BMI compares your weight with your height to give a simple weight-status indicator. It is useful for population-level screening and for personal tracking, but it should be read alongside body composition, waist size, medical history, and fitness level.

What is BMI and how is it calculated?

Body Mass Index (BMI) is a numerical value calculated from your height and weight. It is used as a screening tool to classify individuals into weight categories that may indicate health risks. The formula divides weight in kilograms by height in metres squared.

BMI Formula: BMI = Weight (kg) ÷ Height² (m²)

Example: A person weighing 70 kg and 1.75 m tall has a BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9 — which falls in the Normal range.

BMI categories for adults

The World Health Organization (WHO) defines the following BMI ranges for adults aged 18 and over:

Below 18.5 — Underweight: May indicate malnutrition, eating disorders, or other health conditions
18.5 – 24.9 — Normal weight: Associated with the lowest risk of weight-related health problems
25.0 – 29.9 — Overweight: Increased risk of cardiovascular disease, type 2 diabetes, and hypertension
30.0 – 34.9 — Obese Class I: High risk of metabolic and cardiovascular conditions
35.0 – 39.9 — Obese Class II: Very high risk
40.0 and above — Obese Class III (Severe): Extremely high health risk

BMI for men vs women

The BMI formula is the same for men and women, but the health implications differ slightly. Women naturally carry more essential body fat (approximately 10–13%) compared to men (2–5%) due to hormonal and reproductive functions. This means a woman with the same BMI as a man may have a different body fat percentage. Despite this, WHO uses the same BMI ranges for both sexes in adult classification.

BMI for different age groups

For adults aged 18–65, the standard WHO ranges apply. For children and teenagers, BMI is interpreted differently using age- and sex-specific percentile charts rather than fixed category ranges. For adults over 65, a slightly higher BMI (25–27) may be considered acceptable as some additional weight can be protective in older age.

Limitations of BMI

BMI is a useful population-level screening tool but has important limitations for individuals:

Does not measure body fat directly — a muscular athlete can have a high BMI but very low body fat
Does not account for fat distribution — visceral fat around organs is more dangerous than subcutaneous fat under the skin, but BMI cannot distinguish between them
Varies by ethnicity — Asian populations have higher health risks at lower BMI values; WHO recommends lower thresholds (23 for overweight, 27.5 for obese) for Asian adults
Does not reflect muscle mass — bodybuilders often register as obese by BMI despite very low body fat

For a more complete health picture, combine BMI with waist circumference measurement and, where possible, body fat percentage assessment.

Healthy BMI ranges by age (adults)

18–24 years: 18.5–24.9 (standard range)
25–34 years: 18.5–24.9 (standard range)
35–44 years: 18.5–24.9 (standard range)
45–54 years: 18.5–24.9 (standard range)
55–65 years: 18.5–24.9 (standard range); some guidelines accept up to 27 for older adults
65+ years: 22–27 considered acceptable by many geriatric guidelines

Prefer to enter measurements in kilograms and centimetres? Use our BMI calculator (kg cm) — metric units only.

BMI chart for Indian adults: Asian cutoff thresholds

BMI Range	WHO Category	Asian / India Category	Health Risk
Below 18.5	Underweight	Underweight	Moderate (malnutrition)
18.5–22.9	Normal	Normal	Low
23.0–24.9	Normal (WHO)	Overweight	Moderate (Asian)
25.0–29.9	Overweight	Obese Class I	High
30.0+	Obese	Obese Class II+	Very high

How to reduce BMI safely: rate and method

Safe BMI reduction: 0.05–0.10 BMI points per week (0.5 kg/week for a 170 cm person). Faster reduction risks muscle loss, nutrient deficiency, and rebound weight gain. Method: 300–500 kcal daily deficit through combined diet reduction and exercise. Do not target below BMI 18.5 — this is the underweight threshold. For every 5 kg lost, recalculate your TDEE and adjust your calorie target.

Frequently asked questions about BMI

Is BMI accurate for everyone? BMI is a population screening tool, not a diagnostic measure for individuals. It works reasonably well for most sedentary adults but is less reliable for athletes, elderly individuals, pregnant women, and certain ethnic populations.

What is a healthy BMI for a woman? For adult women, a BMI between 18.5 and 24.9 is considered the normal healthy range. For South and East Asian women, a lower threshold of 23 is often recommended due to higher metabolic risk at lower BMI values.

Can I have a normal BMI but still be unhealthy? Yes. This is called "normal weight obesity" — where someone has a normal BMI but an unhealthy proportion of body fat, especially visceral fat. Waist circumference above 80 cm for women or 94 cm for men indicates elevated risk regardless of BMI.

How do I lower my BMI? BMI decreases when body weight decreases relative to height. A combination of a moderate calorie deficit (300–500 calories below TDEE), adequate protein intake (1.6–2 g per kg of bodyweight), and regular physical activity produces sustainable BMI reduction.

Related health calculators

Use these tools alongside your BMI for a more complete health assessment:

Sources & References

WHO — BMI Classification — Standard categories: <18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, ≥30 obese
ICMR — Asian-Indian Cut-offs — Lower thresholds for Indian populations: overweight ≥23, obese ≥25 (BMI kg/m²)

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⚕️ Medical disclaimer: This calculator provides educational estimates only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your specific situation. Formulas and reference ranges follow WHO and ICMR published guidelines — see our methodology.

How is this different from the BMI kg/cm Calculator?

This is the full BMI calculator supporting both metric and imperial units with complete category analysis. The BMI kg/cm version is a streamlined metric-only page for users who want the fastest kg + cm input with no unit switching. Both use the identical WHO formula and Asian-Indian cut-offs.