BMI 5 ft 4 in 9 st 0 lb

BMI US Metric BMI UK Calories
ft in
st lb

Quick Answer: 5' 4" and 9 st 0 lb = BMI 21.6 (Normal)

Your BMI position: 21.6 — Normal (WHO)

Your BMI Result
21.6 kg/m² Normal

How your BMI was calculated

Formula: BMI = weight (kg) ÷ height (m)²
Your values: 57.2 kg ÷ (1.63 m)²
Height squared: (1.63)² = 2.6426 m²
Result: 57.2 ÷ 2.6426 = 21.6 kg/m²

⚖️ Ideal Weight Range

7 st 10 lb — 10 st 5 lb

For 5' 4" height (BMI 18.5-24.9)

🎯 Weight Goal

✓ You're on target!

Maintain your current healthy weight

How weight changes affect your BMI

See how gaining or losing a few pounds would change your BMI category:

Weight BMI Category
8 st 10 lb -4 20.9 Normal
8 st 12 lb -2 21.3 Normal
9 st 0 lb ← you 21.6 Normal
9 st 2 lb +2 22.0 Normal
9 st 4 lb +4 22.3 Normal

This table shows how your BMI would change with different weights at your current height of 5' 4".

What does a BMI of 21.6 mean?

Your BMI of 21.6 kg/m² is within the healthy normal range.

At 5' 4" and 9 st 0 lb, you are maintaining a healthy weight according to WHO standards. Your BMI falls within the optimal range of 18.5-24.9 kg/m².

Tips to maintain your healthy weight:
  • Continue eating a balanced diet with plenty of fruits and vegetables
  • Stay physically active with at least 150 minutes of moderate exercise weekly
  • Monitor your weight periodically to catch any changes early
  • Remember that BMI is just one health indicator—regular check-ups are important

Remember: BMI is a screening tool, not a diagnostic measure. It doesn't account for muscle mass, bone density, or where fat is distributed. Always consult healthcare professionals for personalised health advice.

More BMI calculations

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BMI 21.6 (Normal) — 5'4" / 9 st 0 lb
BMI 21.6 (Normal) — 5'4" / 9 st 0 lb — conversion chart

This BMI calculator is provided for informational purposes only and does not replace professional medical advice. BMI does not account for muscle mass, bone density, or body composition, and may not be accurate for athletes, pregnant women, children, or elderly individuals. Always consult a qualified healthcare provider before making decisions about your health.

Can BMI be used by everyone?

For most people, BMI provides a good measure of obesity. However, BMI does not provide actual information on body composition (i.e. the proportions of muscle, bone, fat, and other tissues that make up a person's total body weight), and may not be the most appropriate indicator to determine health status for certain groups of people.

Examples of BMI limitations: Athletes with dense bones and well-developed muscles or people with large body frames may be obese by BMI standards (i.e. they have BMIs greater than 30), but yet have little body fat. On the other hand, inactive people may seem to have acceptable weights when, in fact, they may have too much body fat. Similarly, a petite gymnast may be considered underweight but not unhealthy. BMI, when used for children and adolescents who are still growing, pregnant women, people with large body frames, or petite and highly muscular individuals, should be interpreted cautiously (Source: CDC).

Formulas used to calculate BMI

BMI, is calculated as weight divided by height squared. It is a simple measurement of body weight in relation to height. See the formulas below both in the metric system and in the US customary units or imperial systems of measurements:

SI (metric) units

BMI = weight (kg)/(height (m))2

BMI Chart - Understanding Body Mass Index

The table below applies for any person aged 18 years and over. These thresholds do not change with age and are the same for both men and women. Sources: World Health Organization (WHO), National Institutes of Health (NIH), Body Mass Index as a measure of obesity - NHS, Body Mass Index and Health - USDA.
Note: BMI is NOT interpreted the same way for children as it is for adults. For children the relationship between fatness and BMI varies with age and sex, so definitions of obesity and overweight need to take these two variables into account. See CDC's BMI guidelines for children.

BMI below 16.0 Kg/m2Severely underweight
BMI=16.0 to 18.5 Kg/m2Underweight
BMI=18.5 to 24.9 Kg/m2Normal weight
BMI=25 to 29.9 Kg/m2Overweight
BMI of 30 or greater Kg/m2Obese


Excess body fat is correlated to future risk of obesity-related illness. Other measurements you should make are: waist circumference and skin thickness. All these indicate a person’s weight status or body fatness.

BMI Chart

Body mass index chart. Thick lines show the major subdivisions, dashed lines other "principal cut-off points", and dotted lines "additional cut-off points".

Body mass index chart.svg
Created by User:InvictaHOG, Public Domain

Frequently Asked Questions About BMI

What is a healthy BMI range?

A healthy BMI range for adults is 18.5 to 24.9 according to NHS guidelines. This range is associated with the lowest risk of weight-related health problems. However, BMI should be considered alongside other factors like waist circumference, muscle mass, and overall health. Ranges: Underweight (below 18.5), Healthy weight (18.5-24.9), Overweight (25-29.9), Obese (30+). Source: NHS

How do I convert stones and pounds to just pounds for BMI?

To convert: multiply stones by 14 and add remaining pounds. For example, if you weigh 12 stones 7 pounds: (12 × 14) + 7 = 168 + 7 = 175 pounds total. This calculator does the conversion automatically - just enter your weight in stones and pounds, and it calculates your BMI using the standard formula. Remember: 1 stone = 14 pounds exactly, which is the traditional British unit of weight measurement still commonly used in the UK and Ireland.

Is BMI accurate for people with high muscle mass?

No, BMI is not accurate for athletes and bodybuilders. Since muscle weighs more than fat, muscular individuals may have a high BMI (25-30+) while having low body fat percentage. For example, professional rugby players often classify as "overweight" or "obese" by BMI standards despite being in excellent health. Alternative measurements like body fat percentage, waist-to-hip ratio, or DEXA scans are more appropriate for athletes. The NHS recommends checking waist circumference alongside BMI. Source: NHS

Can I use BMI for children and teenagers?

Children require different BMI calculations. For ages 2-18, BMI is calculated the same way but interpreted using age- and sex-specific centile charts. A child's BMI is compared to others of the same age and sex. The NHS uses the UK90 growth reference charts. For example, a BMI on the 91st-98th centile is considered overweight, while 98th centile or above is obese. Always consult your GP or health visitor for children's BMI assessment rather than using adult calculators.

What's the difference between BMI and body fat percentage?

BMI measures weight-to-height ratio, while body fat percentage measures actual fat mass. BMI doesn't distinguish between muscle, bone, and fat - it only uses height and weight. Body fat percentage shows what portion of your body is fat tissue (healthy range: 14-24% for men, 21-31% for women). A person can have normal BMI but high body fat ("normal weight obesity") or high BMI with low body fat (athletic build). For comprehensive health assessment, use both measurements together along with waist circumference.

Does BMI apply to all ethnic groups equally?

No, BMI cutoffs may need adjustment for different ethnicities. Research shows that South Asian, Chinese, and other Asian populations may have higher health risks at lower BMI levels. Public Health England recommends considering a BMI of 23 as the threshold for increased risk in South Asian adults (vs. 25 for white European groups). Black African and African-Caribbean adults may have different body compositions affecting interpretation. Always consult healthcare providers familiar with ethnicity-specific BMI guidelines. Source: NHS

What should I do if my BMI is outside the healthy range?

Book an appointment with your GP for personalized guidance. If your BMI is below 18.5 or above 25, schedule a checkup to discuss underlying causes and health risks. Your GP may recommend: (1) NHS Health Check (blood pressure, cholesterol, blood sugar), (2) Referral to NHS weight management services, (3) Dietitian consultation, (4) Gradual lifestyle changes (diet, exercise, sleep), (5) Treatment for any underlying conditions. Many areas offer free NHS weight loss programmes. Avoid crash diets or extreme exercise. Safe weight change is typically 1-2 pounds (0.5-1 kg) per week.

Medical References & Authoritative Sources

The information on this page is based on guidelines and research from the following trusted medical and health organizations:

Primary Medical Sources:

Additional Clinical Resources:

Disclaimer: These references are provided for educational purposes. Always consult qualified healthcare professionals for personalized medical advice. BMI reference ranges are based on WHO and NIH guidelines for adults aged 18 and over.

Popular BMI Calculations

Quick links to common height and weight combinations:

6'1" / 17 st 0 lb BMI 31.4 6'2" / 18 st 0 lb BMI 32.4 6'4" / 21 st 0 lb BMI 35.8 6'6" / 14 st 7 lb BMI 23.5 6'8" / 21 st 0 lb BMI 32.3 5'0" / 12 st 0 lb BMI 32.8 5'3" / 12 st 0 lb BMI 29.8 5'4" / 12 st 0 lb BMI 28.8 5'6" / 7 st 0 lb BMI 15.8 5'9" / 9 st 7 lb BMI 19.6 5'10" / 12 st 0 lb BMI 24.1 5'10" / 21 st 0 lb BMI 42.2

Related Health Tools

Useful calculators and converters commonly used with BMI:

Cm to Feet+Inches cm/ft BMI Calculator (Metric) m/kg BMI Calculator (US) ft/lbs Ideal Body Weight ft/st Calories Burned kcal Age Calculator years Stones+Pounds to Kg st/kg Kg to Stones+Pounds kg/st