Free Ideal Weight Calculator – Find Your Optimal Weight Online
Knowing your ideal body weight is an important step toward better health. Unlike a single magic number, the ideal weight depends on your height, gender, body frame, and overall fitness. Our calculator uses four of the most respected medical formulas to give you a comprehensive range: Devine, Robinson, Miller, and Hamwi.
The Devine formula, created in 1974 by Dr. B.J. Devine, was originally designed for calculating medicinal dosages based on body weight, but it quickly became a popular method for estimating ideal weight. The Robinson formula (1983) is considered one of the most accurate modifications, while the Miller formula (1983) tends to give slightly higher values for both genders. The Hamwi formula, published in 1964, was one of the earliest and simplest approaches.
All four formulas share a common structure: they start with a base weight for someone who is 5 feet (152 cm) tall and then add a fixed number of kilograms for every additional inch of height. The results vary somewhat, giving you a range rather than a single number, which is more realistic. We also display the BMI-based healthy range (18.5 to 24.9), which provides an additional reference.
Remember, ideal weight calculators are guides, not diagnoses. Factors like muscle mass, bone density, age, and ethnicity influence what is truly ideal for you. Athletes may weigh more than the formula suggests while being perfectly healthy. Use these results as a starting point and consult a healthcare professional for personalized advice.