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Science-Based Calculator
Weight Calculator —
Find Your Ideal Weight by Height, Age & Gender
Your ideal body weight depends on more than just your height — it changes with your age, gender, body frame, and muscle mass. This Weight Calculator uses three scientifically recognised methods — BMI range analysis, Broca Index, and the Devine Formula — to estimate the healthy weight range that is right for you.
3Formulas Used
100%Free to Use
kg & lbsUnits Supported
Between 10 and 100
Enter in centimetres
Enter to compare with your ideal range
Your Ideal Weight Results
Based on BMI, Broca Index & Devine Formula
BMI Visual Indicator
Underweight
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+
<18.5 Normal
18.5–24.9 Overweight
25–29.9 Obese
30+
Recommended Range
Healthy BMI Range
—
kg
BMI 18.5 – 24.9
Based on your height
Based on your height
Broca Index
—
kg
Simple clinical estimate
Height-based formula
Height-based formula
Devine Formula
—
kg
Clinical & fitness standard
Used in medical dosing
Used in medical dosing
These calculations provide general estimates based on standard formulas. Individual results may vary due to muscle mass, bone density, and body composition. Consult a healthcare professional for personalised advice.
Ideal Weight for Women — Height and Weight Chart (Female)
Women generally have a lower ideal weight than men of the same height due to differences in muscle mass, bone density, and body fat distribution.
Hormonal factors, particularly oestrogen, also influence where the body stores fat and what constitutes a healthy body composition for women. The table below shows the ideal weight range for women by height, calculated using a combination of BMI guidelines (18.5–24.9) and the Broca Index.
| Height (cm) | Height (ft'in) | BMI Min (kg) | BMI Max (kg) | Broca (kg) | Devine (kg) |
|---|---|---|---|---|---|
| 145 | 4'9" | 38.9 | 52.4 | 40 | 40.8 |
| 150 | 4'11" | 41.6 | 56.1 | 45 | 43.1 |
| 152 | 5'0" | 42.7 | 57.6 | 47 | 44.2 |
| 155 | 5'1" | 44.4 | 59.8 | 50 | 45.9 |
| 158 | 5'2" | 46.2 | 62.2 | 53 | 47.7 |
| 160 | 5'3" | 47.4 | 63.7 | 55 | 49.4 |
| 163 | 5'4" | 49.2 | 66.2 | 58 | 51.2 |
| 165 | 5'5" | 50.4 | 67.8 | 60 | 52.0 |
| 168 | 5'6" | 52.2 | 70.3 | 63 | 53.8 |
| 170 | 5'7" | 53.5 | 72.0 | 65 | 54.9 |
| 173 | 5'8" | 55.4 | 74.6 | 68 | 56.7 |
| 175 | 5'9" | 56.7 | 76.3 | 70 | 57.8 |
| 178 | 5'10" | 58.6 | 78.9 | 73 | 59.6 |
| 180 | 5'11" | 59.9 | 80.7 | 75 | 60.7 |
Note for Indian Women: The World Health Organization (WHO) suggests that Asian populations may face health risks at a lower BMI threshold (23.0 instead of 25.0). Indian women with a BMI above 23 should discuss their weight with a healthcare professional even if the standard BMI chart classifies them as 'normal weight.'
Ideal Weight for Men — Height and Weight Chart (Male)
Men typically have higher ideal weight values than women at the same height due to greater muscle mass and higher bone density.
The ideal weight range for men also varies with age — younger men with more lean mass may sit at the upper end of the range, while older men may see their ideal weight shift slightly lower as muscle mass naturally declines.
| Height (cm) | Height (ft'in) | BMI Min (kg) | BMI Max (kg) | Broca (kg) | Devine (kg) |
|---|---|---|---|---|---|
| 155 | 5'1" | 44.4 | 59.8 | 55 | 52.6 |
| 158 | 5'2" | 46.2 | 62.2 | 58 | 54.4 |
| 160 | 5'3" | 47.4 | 63.7 | 60 | 56.2 |
| 163 | 5'4" | 49.2 | 66.2 | 63 | 58.0 |
| 165 | 5'5" | 50.4 | 67.8 | 65 | 59.0 |
| 168 | 5'6" | 52.2 | 70.3 | 68 | 60.8 |
| 170 | 5'7" | 53.5 | 72.0 | 70 | 62.6 |
| 173 | 5'8" | 55.4 | 74.6 | 73 | 64.4 |
| 175 | 5'9" | 56.7 | 76.3 | 75 | 65.3 |
| 178 | 5'10" | 58.6 | 78.9 | 78 | 67.1 |
| 180 | 5'11" | 59.9 | 80.7 | 80 | 68.9 |
| 183 | 6'0" | 62.0 | 83.4 | 83 | 70.7 |
| 185 | 6'1" | 63.3 | 85.2 | 85 | 71.7 |
| 188 | 6'2" | 65.4 | 88.0 | 88 | 73.5 |
| 190 | 6'3" | 66.8 | 89.9 | 90 | 74.4 |
What Is a Weight Calculator?
A Weight Calculator is a free online tool that estimates your ideal body weight based on your physical characteristics.
Unlike a bathroom scale that simply shows your current weight, a weight calculator tells you what your weight should be for optimal health — giving you a science-based target to work towards or maintain.
This calculator combines three established medical formulas — BMI (Body Mass Index), the Broca Index, and the Devine Formula — to provide a comprehensive picture rather than relying on a single method. Each formula approaches ideal weight from a slightly different angle, and together they give you a reliable range rather than a single number that may not account for your individual body type.
Why Use Multiple Formulas Instead of Just One?
No single formula is perfect for every person. BMI works well for general populations but overestimates body fat in muscular individuals. The Broca Index is simple and widely used in clinical settings but does not adjust for age. The Devine Formula was originally developed for drug dosage calculations and works best for average body frames. By showing all three results side by side, you get a realistic weight range rather than a misleadingly precise single number.
How to Calculate Ideal Weight — 3 Proven Formulas Explained
Understanding how each formula works helps you interpret your results correctly and decide which estimate is most relevant to your body type.
Method 1 — BMI-Based Healthy Weight Range
BMI (Body Mass Index) is calculated as your weight in kilograms divided by your height in metres squared. A healthy BMI falls between 18.5 and 24.9. To find your healthy weight range, the calculator works backwards: it multiplies the healthy BMI limits (18.5 and 24.9) by the square of your height in metres.
Example: For a person 170 cm tall, the healthy weight range is 53.5 kg to 72.0 kg.
Method 2 — Broca Index
The Broca Index is one of the simplest ideal weight formulas, widely used in Indian clinical practice:
Broca Index Formulas
For Men: Ideal Weight (kg) = Height (cm) − 100
For Women: Ideal Weight (kg) = Height (cm) − 105
For Women: Ideal Weight (kg) = Height (cm) − 105
Example: A man 175 cm tall = 75 kg. A woman 165 cm tall = 60 kg.
Method 3 — Devine Formula
The Devine Formula, originally developed in 1974 for calculating medication dosages, is widely used in clinical and fitness settings:
Devine Formula
For Men: 50 + 2.3 × (height in inches − 60)
For Women: 45.5 + 2.3 × (height in inches − 60)
For Women: 45.5 + 2.3 × (height in inches − 60)
Example: A man 5'10" (178 cm) has a Devine ideal weight of 73 kg.
Quick Comparison of All Three Methods
| Formula | Best For | Limitation | Result Type |
|---|---|---|---|
| BMI Range | General population screening | Overestimates fat in muscular people | Weight range (min–max) |
| Broca Index | Quick clinical estimate in India | Does not adjust for age or frame | Single number |
| Devine Formula | Clinical & fitness settings | Less accurate for very short/tall individuals | Single number |
Average Healthy Weight by Age — Weight Chart for Adults
Your ideal weight shifts as you age. Muscle mass typically peaks in your late 20s to early 30s and gradually declines after 40.
Body fat percentage tends to increase with age. The table below shows average healthy weight ranges for Indian adults by age group, assuming average heights of 165 cm for men and 155 cm for women.
| Age Group | Men — Healthy Range (kg) | Women — Healthy Range (kg) | Key Notes |
|---|---|---|---|
| 18–20 years | 55–70 | 45–58 | Growth may still be completing |
| 21–25 years | 58–73 | 47–60 | Peak muscle-building years |
| 26–30 years | 60–76 | 48–62 | Metabolism begins gradual slowdown |
| 31–35 years | 61–77 | 49–63 | Maintain activity to preserve muscle |
| 36–40 years | 62–78 | 50–64 | Body fat redistribution begins |
| 41–45 years | 62–78 | 50–65 | Hormonal changes affect composition |
| 46–50 years | 61–77 | 50–65 | Strength training becomes critical |
| 51–55 years | 60–76 | 49–64 | Bone density loss accelerates |
| 56–60 years | 59–75 | 48–63 | Focus on functional fitness |
| 61–65 years | 58–74 | 47–62 | Protein needs increase |
| 66–70 years | 57–73 | 46–61 | Consult doctor for personalised targets |
| 70+ years | 55–72 | 45–60 | Preventing underweight equally important |
Important: These ranges are population averages for reference only. Individual ideal weight depends on your specific height, body frame, muscle mass, and medical history. Use the calculator above for your personalised result.
Weight Calculator in kg — Understanding Your Results
All results from this Weight Calculator are displayed in kilograms (kg), which is the standard unit of measurement for body weight in India and most countries worldwide. If you are more familiar with pounds (lbs), you can convert using this simple formula:
Weight Unit Conversion
Weight in lbs = Weight in kg × 2.205
Weight in kg = Weight in lbs ÷ 2.205
Weight in kg = Weight in lbs ÷ 2.205
Quick Reference — Ideal Weight in kg for Common Heights
| Height | Men (kg) | Women (kg) | BMI Healthy Range (kg) |
|---|---|---|---|
| 155 cm / 5'1" | 55–60 | 50–55 | 44–60 |
| 160 cm / 5'3" | 60–65 | 55–60 | 47–64 |
| 165 cm / 5'5" | 65–70 | 58–62 | 50–68 |
| 170 cm / 5'7" | 70–75 | 60–65 | 54–72 |
| 175 cm / 5'9" | 75–80 | 65–70 | 57–76 |
| 180 cm / 5'11" | 78–83 | 68–73 | 60–81 |
Factors That Influence Your Ideal Weight
Your ideal weight is not a single fixed number — it falls within a range shaped by several biological and lifestyle factors.
Height
Height is the single most important determinant of ideal weight. Taller individuals naturally have more bone mass, larger organs, and more muscle tissue. Every additional centimetre of height adds approximately 0.7–1.0 kg to the ideal weight range.
Age
Body composition changes significantly with age. After 30, adults lose approximately 3–5% of muscle mass per decade if they are not strength training. After 50, this rate accelerates.
Gender
Men typically carry 10–20% more muscle mass than women and have denser bones, which is why ideal weight formulas produce higher values for men at the same height.
Body Frame Size
People with larger skeletal frames (wider wrists, broader shoulders) naturally weigh more. A quick test: wrap your thumb and middle finger around your wrist — overlap = small frame, touching = medium, gap = large.
Muscle Mass & Activity Level
Athletes and people who strength-train regularly carry more muscle, which weighs more than fat by volume. A fit, muscular person may weigh more than the 'ideal' range and still be in excellent health.
BMI Range Chart — What Your BMI Category Means
| BMI Range | WHO Category | Asian Category | Risk Level | Action |
|---|---|---|---|---|
| Below 16.0 | Severe Thinness | Severe Thinness | Very High | Seek medical advice immediately |
| 16.0–16.9 | Moderate Thinness | Moderate Thinness | High | Nutritional intervention recommended |
| 17.0–18.4 | Mild Thinness | Mild Thinness | Moderate | Gradual weight gain advised |
| 18.5–22.9 | Normal Weight | Normal Weight | Low | Maintain current weight |
| 23.0–24.9 | Normal Weight | Overweight (Asian) | Increasing | Monitor — higher risk for Asian populations |
| 25.0–29.9 | Overweight | Obese Class I (Asian) | High | Weight management recommended |
| 30.0–34.9 | Obese Class I | Obese Class II (Asian) | Very High | Medical consultation advised |
| 35.0+ | Obese Class II+ | Obese Class III (Asian) | Extreme | Specialist intervention needed |
Asian BMI Note: The WHO recommends lower BMI cutoffs for Asian populations (overweight at 23.0, obese at 25.0) because South Asian and East Asian individuals tend to have higher body fat percentages at the same BMI compared to Caucasian populations. Indian users should pay attention to the Asian Category column.
How to Use This Weight Calculator
Getting your ideal weight result takes less than 30 seconds. Here is how:
1
Enter Your Age
Enter your age in years. The calculator adjusts recommendations based on your life stage.
2
Select Your Gender
Choose Male or Female. This determines which formula variant is used.
3
Enter Your Height
Enter your height in centimetres (cm) or switch to feet and inches (ft/in) using the unit toggle.
4
Click 'Calculate'
You will receive three estimates: your Broca Index ideal weight, your Devine Formula ideal weight, and your healthy BMI weight range.
5
Compare Your Results
If your current weight falls within the healthy BMI range and is close to the Broca/Devine estimates, you are in a healthy zone. If significantly outside, consult a healthcare professional.
Benefits of Knowing Your Ideal Weight
Understanding your ideal weight is not about chasing a number on a scale — it is about using a science-based reference point to make informed health decisions.
Set Realistic Goals
Instead of targeting arbitrary weight loss or gain numbers, you work towards a range that is medically appropriate for your height, age, and gender.
Identify Health Risks Early
Being significantly above or below your ideal weight range is associated with increased risk of Type 2 diabetes, cardiovascular disease, hypertension, and osteoporosis.
Guide Your Nutrition
Knowing whether you need to gain, lose, or maintain weight determines your daily calorie target. Pair this with our Calorie Calculator for a complete picture.
Track Fitness Progress
Tracking whether your weight moves towards the ideal range (while considering muscle gain) is more meaningful than watching the scale alone.
Support Medical Consultations
Having your ideal weight range ready when visiting a doctor or nutritionist gives both of you a useful starting point for health discussions.
Tips to Reach and Maintain Your Ideal Weight
If You Are Below Your Ideal Weight
Increase your daily calorie intake by 300–500 kcal above your maintenance level. Focus on nutrient-dense calorie-rich foods: whole grains (brown rice, oats, whole wheat roti), proteins (eggs, paneer, chicken, lentils), healthy fats (nuts, ghee in moderation, peanut butter), and dairy (full-fat milk, curd). Add progressive resistance training to build lean muscle mass rather than just body fat.
If You Are Above Your Ideal Weight
Create a moderate calorie deficit of 300–500 kcal per day below your maintenance level. Prioritise protein intake (1.2–1.6 g per kg body weight) to preserve muscle during fat loss. Replace processed and fried foods with high-volume low-calorie options like vegetables, salads, fruits, and legumes. Aim for 8,000–10,000 steps daily and include 2–3 strength training sessions per week.
If You Are Within Your Ideal Range
Maintain your current eating habits and activity level. Weigh yourself weekly under consistent conditions (morning, empty stomach) and track the trend. If your weight drifts more than 2–3 kg in either direction over several weeks, recalculate your calorie needs and adjust. Annual health check-ups are recommended to monitor body composition changes that the scale may not reveal.
Frequently Asked Questions About Weight Calculators
Everything you need to know about weight calculation — answered simply.
Weight calculators provide reliable estimates for the general population but do not account for individual factors like muscle mass, bone density, and body composition. They are best used as a general guideline alongside advice from a healthcare professional. Athletes and highly muscular individuals may have a healthy weight above the predicted range.
For a person who is 170 cm tall, the ideal weight is approximately 70 kg for men and 65 kg for women using the Broca Index. The healthy BMI range at this height is 53.5–72.0 kg. Use our Weight Calculator above by entering 170 cm along with your age and gender for a personalised estimate.
You can calculate ideal weight in kg using the Broca Index: Ideal Weight = Height (cm) − 100 for men, or Height (cm) − 105 for women. Alternatively, use BMI: multiply a target BMI of 22 by the square of your height in metres. For example, for 170 cm: 22 × (1.70 × 1.70) = 63.6 kg.
The healthy weight range for women varies by height: 150 cm: 45–56 kg; 155 cm: 50–60 kg; 160 cm: 55–64 kg; 165 cm: 58–68 kg; 170 cm: 60–72 kg; 175 cm: 65–76 kg. These are based on BMI (18.5–24.9) and Broca Index standards. See our detailed women's weight chart above for the complete table.
The average weight for an Indian male is approximately 65–70 kg. However, ideal weight varies significantly with height, age, and body frame. A man of 170 cm should ideally weigh 62–72 kg, while a man of 180 cm should weigh 68–81 kg. Use our calculator above for your personalised range.
Yes, women have different ideal weight ranges than men at the same height due to differences in muscle mass and body fat distribution. Our calculator uses gender-specific formulas and this page includes a dedicated Height-Weight Chart for Women covering heights from 145 cm to 180 cm.
Yes. Once you know your ideal weight range, you can determine whether you need to gain, lose, or maintain weight. This information helps set your daily calorie target. Pair this Weight Calculator with our Calorie Calculator to find how many calories you should eat per day to reach your ideal weight safely.
BMI is a ratio of weight to height (kg/m²) that categorises you as underweight, normal, overweight, or obese. Ideal weight is a specific target in kilograms considered healthy for your height, age, and gender. BMI tells you where you are; ideal weight tells you where you should aim to be.
Ideal weight varies by gender, age, body frame size, and muscle mass. Two people of the same height can have different ideal weights because of differences in gender, age, or skeletal frame. This is why the calculator provides a range rather than a single number.
Recalculate your ideal weight whenever your age bracket changes or if your activity level changes significantly. For progress tracking, weigh yourself weekly under consistent conditions (morning, empty stomach) and compare against your ideal range. The ideal weight target itself only needs recalculating once or twice a year.
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