Determine your ideal body weight, BMI status, and daily caloric needs based on scientific formulas.
Male
Female
Gender affects lean body mass calculations.
Adults aged 18-100.
Please enter a valid age (18-100).
Height in centimeters.
Please enter a valid height.
Height in feet and inches.
Your current body weight.
Your current body weight.
Sedentary (Little to no exercise)
Lightly Active (1-3 days/week)
Moderately Active (3-5 days/week)
Very Active (6-7 days/week)
Extra Active (Physical job or training)
Used to calculate daily calorie needs (TDEE).
Healthy Weight Range
56.7 – 76.6 kg
Ideal Weight (Devine Formula): 70.0 kg
BMI Score
22.9
Normal
BMR (Metabolism)
1,650 kcal/day
TDEE (Maintenance)
1,980 kcal/day
Note: The Healthy Weight Range is based on a BMI of 18.5 to 24.9. The "Ideal Weight" uses the Devine Formula, widely used medically for dosage but strictly height-based.
Chart Visualization: Your current weight vs. BMI categories.
Ideal Body Weight (IBW) Estimates
Formula
Estimated Ideal Weight
Basis
Comparison of different medical formulas for calculating ideal body weight.
What is an Age Height Weight Calculator?
An age height weight calculator is a digital health tool designed to evaluate your body metrics against medical standards. While weight alone is a simple number on a scale, it does not tell the whole story of your health. By integrating factors like age, gender, and height, this calculator provides a multi-dimensional view of your physical status.
These calculators are primarily used by adults seeking to understand if their current weight falls within a healthy range to minimize the risk of chronic diseases like diabetes, hypertension, and heart disease. It is important to note that these tools offer statistical averages based on population data and do not account for muscle mass density or frame size directly, which is a common misconception among athletes.
Age Height Weight Calculator Formula and Mathematical Explanation
This calculator utilizes several distinct formulas to provide a comprehensive health overview. The two most critical are the Body Mass Index (BMI) and the Devine Formula for Ideal Body Weight (IBW).
1. Body Mass Index (BMI)
BMI is a screening tool that compares weight to height.
Originally developed to calculate medicinal dosages, this formula is now a standard for estimating ideal weight.
Men: 50 kg + 2.3 kg × (Height in inches – 60)
Women: 45.5 kg + 2.3 kg × (Height in inches – 60)
Variable Definitions
Variable
Meaning
Unit
Typical Range
Height
Vertical stature
cm / in
140cm – 210cm
Weight
Total body mass
kg / lbs
40kg – 150kg+
Age
Years lived (affects BMR)
Years
18 – 100
BMR
Basal Metabolic Rate
Calories
1200 – 2500+
Key variables used in health metric calculations.
Practical Examples (Real-World Use Cases)
Example 1: The Office Worker
Profile: Sarah is a 35-year-old female, 165 cm (5'5″) tall, weighing 75 kg (165 lbs), with a sedentary job.
Calculator Input: Female, Age 35, Height 165cm, Weight 75kg, Sedentary.
Output & Interpretation:
The age height weight calculator shows her BMI is 27.5 (Overweight category). Her BMR is approximately 1,480 calories/day. To maintain her current weight, she needs ~1,770 calories (TDEE). The result suggests a healthy target weight range of 50kg – 68kg. This financial-style breakdown helps Sarah plan a calorie deficit.
Example 2: The Aging Male
Profile: Robert is a 60-year-old male, 178 cm (5'10") tall, weighing 85 kg (187 lbs), moderately active.
Output & Interpretation:
His BMI is 26.8 (Slightly Overweight). Due to his age, his BMR (1,680 cal) is lower than a younger man of the same size. However, his activity level raises his TDEE to ~2,600 calories. The tool indicates his Ideal Body Weight (Devine) is roughly 73 kg.
How to Use This Age Height Weight Calculator
Select Unit System: Choose between Metric (kg/cm) or Imperial (lbs/ft).
Enter Biological Details: Accurately input gender and age. Age specifically refines the BMR calculation.
Input Measurements: Enter your exact height and current weight.
Select Activity Level: Be honest about your weekly exercise to get an accurate daily calorie estimate.
Analyze Results: Look at the "Healthy Weight Range" for your long-term goal and "TDEE" for immediate dietary planning.
Key Factors That Affect Age Height Weight Results
While the calculator provides mathematically precise figures, biological reality is nuanced. Consider these factors:
Muscle Mass: Muscle is denser than fat. An athlete may register as "overweight" by BMI standards despite having low body fat and excellent health.
Age & Metabolism: As you age, muscle mass naturally decreases (sarcopenia), and metabolism slows. The age height weight calculator accounts for this in the BMR output.
Bone Density: Frame size varies. People with larger skeletal frames may naturally weigh more than the "ideal" formulas suggest.
Gender Differences: Men generally possess more lean mass than women, resulting in higher BMRs and higher ideal weight targets for the same height.
Hydration Levels: Daily weight can fluctuate by 1-2 kg due to water retention, salt intake, or hormonal cycles, temporarily skewing results.
Fat Distribution: Visceral fat (around organs) is riskier than subcutaneous fat. Two people with the same stats may have different health risks based on where fat is stored.
Frequently Asked Questions (FAQ)
Does age affect my BMI score?
Technically, the math for BMI does not change with age for adults. However, acceptable BMI ranges can shift slightly for the elderly, where being slightly heavier may be protective against frailty.
Why does the calculator ask for gender?
Gender is crucial for calculating BMR (metabolic rate) and Ideal Body Weight formulas, as men and women have different baseline body compositions.
Is this calculator suitable for children?
No. This age height weight calculator utilizes adult formulas. Children require pediatric growth charts (percentiles) because they are still developing.
What is TDEE?
TDEE stands for Total Daily Energy Expenditure. It represents the total calories you burn in a day, including exercise. Eating below this number typically leads to weight loss.
How accurate is the "Ideal Weight"?
It is an estimate. Formulas like Devine or Robinson are statistical averages. A "healthy" weight is a range, not a single number.
Can I use this if I am pregnant?
No. Pregnancy alters weight and metabolic needs significantly. Please consult an obstetrician for healthy weight gain guidelines.
Why is my BMI "Normal" but I feel overweight?
You may be "skinny fat," meaning you have a normal weight but low muscle mass and higher body fat percentage. Resistance training can help improve body composition.
How often should I check these numbers?
Checking your weight status once a month is sufficient. Daily fluctuations are normal and shouldn't cause alarm.
Related Tools and Internal Resources
Enhance your health planning with our suite of specialized calculators: