Scientifically derived ideal weight estimates based on female-specific formulas (Robinson, Miller, Devine, Hamwi).
Enter height in centimeters (e.g., 165)
Enter height in feet and inches
Please enter a valid height.
Ideal weight formulas are generally applicable for adults 18+
Please enter a valid age (18+).
Small Frame (Light)
Medium Frame (Average)
Large Frame (Heavy)
Affects calculation by ±10%
Estimated Ideal Weight Range
55 – 61 kg
Based on composite of Devine, Robinson & Miller formulas adjusted for frame size.
Robinson Formula—
Miller Formula—
Devine Formula—
Healthy BMI Limit (24.9)—
Formulas
BMI Cap
Detailed Formula Breakdown
Method
Value (kg)
Notes
Comparison of calculated ideal weights based on different historical formulas.
What Is an Ideal Weight Calculator for Women?
An ideal weight calculator women is a specialized digital tool designed to estimate a healthy body weight range specifically for female physiology. Unlike generic calculators, it accounts for biological differences in body composition between men and women. While no single number fits everyone, these tools provide a scientific baseline derived from decades of medical research and actuarial data.
This tool is essential for women who are setting fitness goals, monitoring recovery, or managing long-term health. It helps distinguish between subjective aesthetic goals and medically recommended weight ranges that correlate with longevity and reduced risk of chronic diseases like diabetes and hypertension.
Common Misconception: Many believe there is one "perfect" weight. In reality, a healthy weight is a range. Factors like muscle mass, bone density (frame size), and age play critical roles. This calculator provides a range based on four distinct formulas to give a comprehensive view rather than a single, rigid target.
Ideal Weight Calculator Women: Formulas and Math
The calculation of ideal body weight (IBW) for women relies on several established medical equations. Most of these equations calculate a baseline weight for a height of 5 feet and add a specific amount for every inch over 5 feet.
The core logic used in this calculator includes:
1. The Robinson Formula (1983)
Designed to improve upon earlier metrics, this is often used for average populations.
Formula: 49 kg + 1.7 kg per inch over 5 feet.
2. The Miller Formula (1983)
Often produces a slightly lower estimate, which some experts argue aligns better with modern BMI charts for lighter frames.
Formula: 53.1 kg + 1.36 kg per inch over 5 feet.
3. The Devine Formula (1974)
Originally for dosage calculations, this is the most widely used formula in medical settings.
Formula: 45.5 kg + 2.3 kg per inch over 5 feet.
4. The Hamwi Formula (1964)
A simple rule of thumb often used in dietetics.
Formula: 100 lbs + 5 lbs per inch over 5 feet.
Variables Table
Variable
Meaning
Unit
Typical Range
Height
Vertical stature
cm / ft
140cm – 200cm
Inches > 5ft
Height exceeding 60 inches
inches
0 – 24
Frame Size
Thickness of bone structure
Factor
0.9 (Small) to 1.1 (Large)
Key variables used in calculating ideal weight for women.
Practical Examples (Real-World Use Cases)
Example 1: The Average Height Woman
Scenario: Sarah is 30 years old, 165 cm (approx 5'5″) tall, with a medium frame. She wants to know her medically recommended weight to set a realistic diet goal.
Input Height: 165 cm (5 feet 5 inches)
Frame Size: Medium
Devine Calculation: 45.5 + (2.3 × 5) = 57 kg
Robinson Calculation: 49 + (1.7 × 5) = 57.5 kg
Result: Sarah's ideal weight is centrally located around 57 kg (125 lbs). A healthy range would be roughly 54kg to 60kg.
Example 2: Tall Woman with Large Frame
Scenario: Elena is a volleyball player, 180 cm (approx 5'11") tall, with a larger bone structure (Large Frame).
Input Height: 180 cm (11 inches over 5ft)
Frame Size: Large (1.1x multiplier)
Base Hamwi (Medium): 100 lbs + (5 × 11) = 155 lbs
Frame Adjustment: 155 lbs × 1.1 = 170.5 lbs
Result: Due to her large frame, Elena's ideal weight is significantly higher at approximately 77 kg (170 lbs). Generic charts might label her "overweight" without this frame adjustment.
How to Use This Ideal Weight Calculator Women
Select Unit System: Choose between Metric (kg/cm) or Imperial (lbs/ft) using the toggle at the top.
Enter Height: Input your accurate height. If using imperial, break it down into feet and inches.
Select Frame Size:
Small: Wrist circumference less than 6″ (15cm).
Medium: Wrist circumference 6″ – 6.5″.
Large: Wrist circumference greater than 6.5″.
Review Results: Look at the highlighted "Estimated Ideal Weight Range." This aggregates the formulas.
Check the Chart: Use the chart to visualize where different medical formulas place your ideal weight compared to the upper limit of a healthy BMI.
Key Factors That Affect Ideal Weight Results
Several physiological and lifestyle factors influence what constitutes an "ideal" weight for women:
1. Muscle Mass vs. Fat Mass
Muscle is denser than fat. An athletic woman may weigh more than the calculator suggests but be perfectly healthy. These calculators generally assume an average body composition.
2. Bone Density (Frame Size)
As demonstrated in the examples, bone structure accounts for significant weight variance. A large frame can add 10-15% to a healthy baseline weight.
3. Age and Metabolism
Metabolism slows with age, often leading to natural weight gain. While formulas don't always adjust for age, maintaining a weight slightly higher in the calculated range is often acceptable for women over 50 to support bone health.
4. Hormonal Fluctuations
Fluid retention due to menstrual cycles can cause temporary weight fluctuations of 1-3 kg. It is best to average your weight over a month rather than relying on a single daily measurement.
5. Pregnancy and Post-Partum
These calculators are not applicable for pregnant or breastfeeding women. Specific medical charts must be used during these periods to ensure fetal and maternal health.
6. Health History
Women with a history of eating disorders should use these numbers with caution and under professional guidance. The "ideal" is a health metric, not a strict limit.
Frequently Asked Questions (FAQ)
1. Why do different formulas give different results?
Each formula was developed based on different population data sets at different times. The Devine formula is widely used for medication dosing, while Hamwi is popular for dietary goals. We display all of them to give you a consensus range.
2. Is BMI better than Ideal Body Weight (IBW)?
BMI is a screening tool for populations, while IBW is more specific to height. However, neither measures body fat directly. Using both together provides a better picture.
3. What if my weight is above the calculated range?
Being above the range does not automatically mean you are unhealthy, especially if you have high muscle mass. Consult a doctor to assess body composition and metabolic health.
4. Does this apply to teenagers?
No. Children and teenagers are still growing, and their weight-for-height ratios differ. Use a pediatric growth chart for anyone under 18.
5. How do I know my frame size?
Wrap your thumb and middle finger around your wrist. If they overlap, you likely have a small frame. If they touch, medium. If they don't meet, large.
6. Can I use this calculator if I am an athlete?
Athletes should interpret these results with caution. High muscle mass often results in a weight higher than the "ideal" without being unhealthy.
7. How often should I check my ideal weight?
Adult height rarely changes, so your target range remains stable. You only need to recalculate if your long-term health goals change or as you age significantly.
8. What is the most accurate formula for women?
The Devine formula (1974) is generally considered the standard for medical accuracy in women, though the Robinson formula is also highly respected.
Related Tools and Internal Resources
Enhance your health journey with our suite of specialized calculators:
BMI Calculator for WomenCheck if your weight falls within the WHO classification for underweight, normal, overweight, or obese.