Ideal Weight Calculator
Find your ideal body weight using four proven medical formula, Devine, Robinson, Miller, and Hamwi, along with a BMI-based healthy weight range. Enter your height and current weight to see how your weight compares to your ideal range.
What Is Ideal Weight?
Ideal weight is a weight range that is considered healthy for a person of your height, gender, and body frame. It is not a one-size-fits-all number but rather a range that helps you understand what a healthy weight might look like for your body type.
This calculator uses four proven medical formulas — Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964) — along with a BMI-based healthy weight range (18.5–24.9). It also calculates your current BMI using your weight and height to show where you stand relative to your ideal weight.
How Do the Formulas Work?
Devine Formula (1974)
Male: 50.0 kg + 2.3 kg per inch over 5 feet
Female: 45.5 kg + 2.3 kg per inch over 5 feet
Robinson Formula (1983)
Male: 52.0 kg + 1.9 kg per inch over 5 feet
Female: 49.0 kg + 1.7 kg per inch over 5 feet
Miller Formula (1983)
Male: 56.2 kg + 1.41 kg per inch over 5 feet
Female: 53.1 kg + 1.36 kg per inch over 5 feet
Hamwi Formula (1964)
Male: 48.0 kg + 2.7 kg per inch over 5 feet
Female: 45.5 kg + 2.2 kg per inch over 5 feet
BMI Healthy Range
Weight range for BMI 18.5–24.9 based on your height
Your BMI
BMI = Weight (kg) ÷ Height (m)²
❓ Ideal Weight Calculator FAQ
What is ideal body weight?
Ideal body weight is a weight range that is considered healthy for a person of your height, gender, and body frame. It is calculated using various medical formulas and helps guide health and fitness goals.
What are the Devine, Robinson, Miller, and Hamwi formulas?
These are four proven medical formulas for calculating ideal body weight. Devine (1974) is the most widely used, especially for medication dosing. Robinson (1983), Miller (1983), and Hamwi (1964) provide alternative estimates.
Which formula is the most accurate?
The Devine formula is the most widely used in clinical settings and is generally considered the standard. However, all formulas provide estimates, and the best approach is to consider the range of results.
How does frame size affect ideal weight?
People with larger frames generally have more muscle and bone mass, so their ideal weight range is slightly higher. Small frames have a slightly lower range. This calculator adjusts the range based on your selected frame size.
What is the BMI healthy weight range?
A BMI between 18.5 and 24.9 is considered normal and healthy. For your height, the BMI healthy weight range is the weight range that would keep your BMI within this zone.
How do I calculate my BMI?
BMI = Weight (kg) ÷ Height (m)². This calculator automatically calculates your BMI when you enter your weight and height.
Is ideal weight the same as healthy weight?
Not exactly. Ideal weight is a calculated estimate based on formulas, while healthy weight is a broader range that considers overall health, muscle mass, and body composition. This calculator provides both perspectives.
Why do the different formulas give different results?
Each formula was developed at different times using different populations and methods. They have different base weights and adjustment factors, which is why results vary slightly. This is why a range is more useful than a single number.
What is the Devine formula for ideal weight?
The Devine formula for men is 50.0 kg + 2.3 kg per inch over 5 feet. For women, it is 45.5 kg + 2.3 kg per inch over 5 feet. It was developed in 1974 and is the most commonly used formula.
What is the Robinson formula?
The Robinson formula (1983) uses a base weight of 52.0 kg for men and 49.0 kg for women, adding 1.9 kg per inch for men and 1.7 kg per inch for women over 5 feet.
What is the Miller formula?
The Miller formula (1983) uses a base weight of 56.2 kg for men and 53.1 kg for women, adding 1.41 kg per inch for men and 1.36 kg per inch for women over 5 feet.
What is the Hamwi formula?
The Hamwi formula (1964) uses a base weight of 48.0 kg for men and 45.5 kg for women, adding 2.7 kg per inch for men and 2.2 kg per inch for women over 5 feet.
What is a healthy BMI range?
A healthy BMI range for adults is 18.5 to 24.9. BMI below 18.5 is underweight, 25 to 29.9 is overweight, and 30 or above is obese. This calculator shows your BMI category based on your current weight.
Is this calculator suitable for athletes and bodybuilders?
These formulas were designed for the general population and may not be accurate for athletes with high muscle mass. Muscle weighs more than fat, so athletes may have a higher BMI while still being healthy. For athletes, body fat percentage is a better indicator.
How do I use the ideal weight range for fitness goals?
Use the ideal weight range as a general guide for a healthy weight goal. If you're within the range, focus on maintaining a healthy lifestyle. If you're above or below, consider gradual changes in diet and exercise to move toward the range.
What is the difference between ideal weight and goal weight?
Ideal weight is a medically calculated estimate based on height and gender. Goal weight is a personal target you set for yourself, which may be different based on your fitness, health, or aesthetic goals.
How often should I recalculate my ideal weight?
Your ideal weight is primarily based on your height, which doesn't change significantly in adulthood. However, you may want to recalculate if you experience significant weight changes, pregnancy, or changes in health status.
How accurate is this ideal weight calculator?
This calculator provides estimates based on established medical formulas. While these formulas are widely used and trusted, they are estimates and may not perfectly reflect your individual needs. Always consult with a healthcare professional for personalized advice.