Ideal Weight Calculator
Your ideal body weight according to four peer-reviewed formulas, plus the healthy BMI range for your height.
What Does "Ideal Weight" Actually Mean?
The ideal weight refers to an estimated weight range that suits your height and gender based on established medical formulas. It serves as a practical reference instead of a fixed target because each person has a unique body shape, muscle mass, and lifestyle. Two people with the same height can still have different healthy weights. Instead of chasing one exact number, use ideal weight as a starting point to better understand your body and make informed health or fitness decisions.
The Four Formulas
Healthcare professionals originally created these formulas to estimate a suitable body weight, especially when calculating medication dosages. They were never designed as appearance goals or beauty standards. Each formula estimates a healthy reference weight based on your height and gender, so the result works better as a guideline than an exact target.
Robinson: men 52 + 1.9/in over 5ft · women 49 + 1.7/in Miller: men 56.2 + 1.41/in over 5ft · women 53.1 + 1.36/in Hamwi: men 48 + 2.7/in over 5ft · women 45.5 + 2.2/in (all results in kg)
Each formula increases weight at a different rate as height increases. Hamwi produces the largest increase, while Miller changes the least. In our Ideal Weight Calculator site, you can find all four of these formulas to calculate their average. Besides, this calculator also displays the healthy BMI range of 18.5–24.9 for a broader reference.
What Matters More Than the Number
Actually, your ideal weight is only one part of the bigger picture. Two people can reach the same estimated weight while having very different amounts of muscle and body fat. Measurements such as waist circumference, body fat percentage, blood pressure, blood lipid levels, and overall fitness often provide a better understanding of your health. If your goal is to gain or lose weight, combine your ideal weight estimate with a Calorie Deficit Calculator to build a more realistic plan.
What Is Ideal Weight Calculator?
Ideal Weight Calculator estimates a healthy reference weight using only your height and gender. Instead of relying on a single equation, it compares four widely used formulas and calculates their average. Our calculator also displays your healthy BMI weight range, giving you more than one way to understand your result. This combination makes it easier to compare estimates and view your ideal weight from different medical perspectives.
How This Calculator Works
- Set the Core: Select US Units or Metric for your measurements, then choose your gender.
- Enter Your Height: Type your exact current height based on the corresponding unit.
- Calculate Your Result: Click Calculate Ideal Weight to generate your estimated weight range.
- Review Your Results: Compare the average ideal weight, four formula results, and your healthy BMI weight range.
Understanding Your Results
The average ideal weight combines the results from the Devine, Robinson, Miller, and Hamwi formulas. Since each formula uses a different calculation method, small differences between the estimates are completely normal.
Your healthy BMI range provides another useful reference by showing the weight range that matches a BMI between 18.5 and 24.9. Instead of focusing on one exact number, compare all results together to build a more realistic understanding of your healthy weight range.
Frequently asked questions
Why do different formulas give different ideal weights?
Each formula was developed by different researchers using their own calculation methods. So, small differences between the results are normal, which is why our Ideal Weight Calculator compares all four formulas instead of relying on only one.
Should I rely on ideal weight alone for my health?
No. Ideal weight is only a reference. Instead, your body fat percentage, muscle mass, waist circumference, and overall health provide a more complete picture than body weight alone.
Does age change my ideal weight?
The four formulas do not include age in their calculations. In practice, adults over 65 may benefit from a slightly higher BMI, up to around 27, because extra muscle and energy reserves can better support recovery during illness.
References
- Devine BJ. Gentamicin therapy. Drug Intell Clin Pharm, 1974.
- Robinson JD, et al. Determination of ideal body weight for drug dosage calculations. Am J Hosp Pharm, 1983.
- Pai MP, Paloucek FP. The origin of the "ideal" body weight equations. Ann Pharmacother, 2000.