Ideal Weight Calculator

What is Ideal Weight?

Ideal body weight (IBW) is a weight range associated with the lowest risk of mortality and disease. Multiple scientific formulas have been developed to estimate ideal weight based on height, gender, and sometimes body frame size. No single formula is perfect — our calculator averages four methods to give you the most reliable range.

The Four Formulas

Robinson (1983): Developed for medical dosing calculations. Miller (1983): Similar to Robinson but slightly different coefficients. Devine (1974): Originally created for drug dosage, now widely used in clinical settings. Hamwi (1964): One of the earliest formulas, still used as a quick reference. Each formula was derived from actuarial data linking weight to longevity.

Body Frame Size

Your body frame — small, medium, or large — affects your ideal weight range. A person with a large frame can carry more weight healthily than someone with a small frame at the same height. Frame size can be estimated by measuring wrist circumference or elbow breadth.

Beyond the Number

Ideal weight formulas don't account for muscle mass, body fat percentage, or fat distribution. Use ideal weight as a general guideline, not an absolute target. Combine with body fat percentage and waist-to-hip ratio for a complete health assessment.

Ideal Weight for My Height — Complete Chart

Here are approximate ideal weight ranges by height using the Devine formula: 150cm: 45-50kg, 160cm: 52-58kg, 170cm: 60-67kg, 180cm: 68-76kg, 190cm: 77-86kg. These are for medium frame; subtract 10% for small frame, add 10% for large frame. Women subtract about 2-3kg from these values.

Ideal Weight Calculator for Men vs Women

All four formulas (Robinson, Miller, Devine, Hamwi) produce different ideal weights for men and women at the same height. For a 170cm person: male ideal weight ranges 63-70kg, female ranges 57-64kg. This gender difference reflects natural variations in muscle mass, bone density, and body fat distribution between sexes.

Ideal Weight vs Healthy Weight — What Is the Difference?

Ideal weight is a calculated target based on statistical formulas. Healthy weight is a broader range (BMI 18.5-24.9) that accounts for individual variation. Your personal best weight depends on muscle mass, frame size, age, and health goals — not just a formula. Use ideal weight as a starting point, not an absolute goal.