Ideal Weight Calculator
Calculate your ideal body weight using the Devine formula with gender and frame size adjustments. Get your healthy weight range and BMI equivalent instantly.
About This Calculator
Our Ideal Weight Calculator uses the Devine formula, one of the most widely used methods for estimating ideal body weight. The formula provides different calculations for men and women, and we further adjust based on your frame size (small, medium, or large).
Your ideal weight is a useful reference point for health and fitness goals, but it's important to remember that it's an estimate. Healthy body weight exists on a range, which is why we also show your healthy weight range based on BMI standards.
Devine Formula:
- Males: 50 kg + 0.91 kg per cm over 152.4 cm
- Females: 45.5 kg + 0.91 kg per cm over 152.4 cm
Frame Size Adjustments:
- Small Frame: -10% of Devine weight
- Medium Frame: No adjustment
- Large Frame: +10% of Devine weight
BMI Categories:
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 - 24.9
- Overweight: BMI 25 - 29.9
- Obese: BMI 30 or higher
Note: Ideal weight formulas provide estimates and are not diagnostic. Consult with a healthcare professional for personalized medical advice.
Frequently Asked Questions
What is the Devine formula for ideal weight?
The Devine formula is a widely used method for calculating ideal body weight. For men: 50 kg + 0.91 kg per cm over 152.4 cm (5 feet). For women: 45.5 kg + 0.91 kg per cm over 152.4 cm. It was originally developed for medication dosing but has become a general reference for ideal weight estimation. Our calculator adjusts this base weight based on your frame size for a more personalized result.
How does frame size affect ideal weight?
Frame size accounts for differences in bone structure and body build. People with small frames (smaller bone structure) naturally weigh less, while those with large frames weigh more at the same height. Our calculator adjusts the Devine formula weight by -10% for small frames and +10% for large frames. Medium frame uses the formula weight without adjustment. You can estimate your frame size by measuring your wrist circumference relative to your height.
What is the difference between ideal weight and healthy weight range?
Ideal weight is a single estimated target weight based on formulas like Devine. A healthy weight range is broader, based on the BMI range of 18.5-24.9, representing weights associated with lowest health risks. While ideal weight provides a specific goal number, the healthy weight range shows the full spectrum of weights considered healthy for your height. Most people naturally fall somewhere within this range.
Is the Devine formula accurate for everyone?
The Devine formula has limitations. It doesn't account for muscle mass, body composition, age, or ethnicity. Athletes with high muscle mass may show as "overweight" by the formula, while elderly individuals might have lower muscle mass. The formula was derived from a specific population and may be less accurate for certain ethnic groups. Use it as a general reference rather than a strict target.
How does ideal weight differ between men and women?
The Devine formula uses different base weights for men and women: 50 kg for men vs 45.5 kg for women. This difference accounts for women's naturally higher body fat percentage and different body composition. On average, women have 6-10% more essential body fat than men. The formula uses the same 0.91 kg per cm adjustment for both genders beyond the base height of 152.4 cm.
What is the healthy BMI range and how does it relate to ideal weight?
The healthy BMI range is 18.5-24.9 for adults, as defined by the World Health Organization. Your ideal weight by the Devine formula may fall within or near this range. Our calculator shows both your BMI equivalent at your ideal weight and the corresponding healthy weight range for your height. If your ideal weight BMI falls outside the healthy range, the healthy weight range provides an alternative target.
How can I measure my frame size?
Frame size is typically estimated using wrist circumference relative to height. For women: height under 158 cm with wrist under 14 cm = small, 14-15.5 cm = medium, over 15.5 cm = large. For men: height over 168 cm with wrist 15-17 cm = medium. Alternatively, use the elbow breadth method: measure the distance between the two bony prominences of your elbow while your arm is bent at 90 degrees. Compare with height-specific charts.
Why does age matter in weight calculations?
Age affects body composition. As we age, muscle mass typically decreases while body fat increases, even at the same weight. However, the Devine formula doesn't directly adjust for age. Our calculator accepts age as an optional input for informational purposes. For older adults (65+), a slightly higher BMI (23-27) may be healthier as it provides reserves against illness and frailty.
What are the limitations of ideal weight formulas?
Ideal weight formulas like Devine have several limitations: they don't consider muscle-to-fat ratio, bone density, ethnic differences, or individual health conditions. They were developed primarily from Caucasian populations and may be less accurate for other ethnicities. Bodybuilders and athletes often exceed formula predictions due to muscle mass. These formulas are screening tools, not diagnostic instruments. Always consult a healthcare provider for personalized health advice.