Ideal Weight Calculator
Select your gender and enter your height to calculate your standard weight (Broca formula) and your healthy weight range based on BMI.
About This Tool
There is no single absolute standard for "ideal weight" — the medical community commonly estimates it with different formulas. This tool provides the two most representative references:
1. Standard Weight (Broca formula): a simple formula widely used in China — Men: height (cm) − 105; Women: height (cm) − 100. A measured weight within ±10% of this value is generally considered normal.
2. Healthy Weight Range (BMI-based): derived from the widely used adult BMI range (18.5–23.9), healthy weight range = height (m)² × 18.5 to height (m)² × 23.9. This range is more scientifically grounded and is the main basis for weight management advice.
The two results may differ — that is perfectly normal, since formulas are statistical estimates. When setting a weight loss or gain goal, it is best to use the BMI healthy range as the main reference, evaluate it together with body fat rate, waist circumference, and other indicators, and do so under the guidance of a doctor or dietitian.
How to Use
- Select your gender (male / female).
- Enter your height in centimeters.
- Click "Calculate Ideal Weight" to see your standard weight and healthy weight range.
FAQ
What does ±10% of standard weight mean?
For example, if your standard weight is 65 kg, anything from 58.5 to 71.5 kg counts as normal. Being 10–20% below or above the standard is mildly underweight/overweight, and more than 20% deserves attention.
Why are the formulas different for men and women?
Male and female body composition differ: men generally have larger bones and more muscle mass, so a healthy weight at the same height is slightly higher. That is why the Broca formula subtracts more for men (105) than for women (100).
What if my ideal weight differs a lot from my goal?
Formulas are only references. Weight is affected by frame size, muscle mass, and more. Evaluate yourself together with BMI, body fat rate, and waist circumference, and consult a doctor or registered dietitian if needed — do not chase a single number blindly.
Can teenagers use this tool?
No. Teenagers are still growing and should be assessed with age- and gender-specific growth curves (such as BMI percentiles). Adult formulas do not apply to people under 18.
How fast is healthy weight loss?
Losing 0.5–1 kg per week is generally recommended. Losing weight too quickly tends to burn muscle, lower metabolism, and lead to rebound. Combining dietary adjustments with regular exercise is the most sustainable approach.