Ideal Weight Calculator
Find out how much you should weigh. This calculator shows your ideal body weight from the four clinical formulas — Devine, Robinson, Miller and Hamwi — plus the healthy BMI weight range for your height.
How This Calculator Works
The four formulas were all built for clinical settings and share the same logic: a base weight at 5 feet (152 cm) plus a fixed amount for every inch above it, with separate constants for men and women.
- Devine (1974) — men: 50 kg + 2.3 kg per inch over 5 ft; women: 45.5 kg + 2.3 kg per inch. Created for medication dosing, it is still the most widely cited.
- Robinson (1983) — men: 52 kg + 1.9 kg per inch; women: 49 kg + 1.7 kg per inch. A revision of Devine with a gentler slope.
- Miller (1983) — men: 56.2 kg + 1.41 kg per inch; women: 53.1 kg + 1.36 kg per inch.
- Hamwi (1964) — men: 48 kg + 2.7 kg per inch; women: 45.5 kg + 2.2 kg per inch. The most generous formula for taller people.
The calculator also converts your height to metres and multiplies it by itself, then applies the WHO healthy BMI band of 18.5 to 24.9 to show a weight range. Unlike the formulas, this range does not depend on sex.
Keep in mind that none of these numbers account for muscle mass. If you carry a lot of muscle, a formula result may label you as overweight when your body fat is actually low — our BMI calculator and body fat calculator give you the fuller picture.
References & Sources
Frequently Asked Questions
How much should I weigh for my height?
There is no single number. A 5'10" (178 cm) man has a healthy BMI range of about 58.5 to 78.8 kg (129 to 174 lb), while the Devine formula puts his ideal weight near 73 kg (161 lb). Use the healthy range as the boundary and a formula value as a target within it.
What is the Devine formula for ideal body weight?
For men: 50 kg + 2.3 kg for every inch over 5 feet. For women: 45.5 kg + 2.3 kg per inch over 5 feet. B.J. Devine published it in 1974 to dose the antibiotic gentamicin, and it remains the standard ideal-body-weight equation in medical practice.
Which ideal weight formula is the most accurate?
None is a perfect target. The four formulas typically fall within a few kilograms of each other and ignore muscle mass and body composition. The healthy BMI range is usually the more useful guide, because it is a band tied to measured health outcomes rather than a single point estimate.
Does ideal body weight change with age?
The formulas only use height and sex, and adult height barely changes, so your calculated ideal weight stays the same from about age 20 onward. What does change is body composition: research suggests older adults maintain better health at a slightly higher BMI, so treat the lower end of the range as less critical after 65.
BMI Calculator
Calculate your body mass index (BMI) and see your WHO weight category instantly. BMI is a quick screening tool that compares your weight to your height - this calculator also shows the healthy weight range for your height so you know your target.
Body Fat Calculator
Estimate your body fat percentage with nothing but a tape measure. This calculator uses the US Navy circumference method, which predicts body fat from neck, waist, and hip measurements - one of the most accurate field methods validated against lab testing.
TDEE Calculator (Daily Calories)
Calculate your Total Daily Energy Expenditure (TDEE) - the number of calories you burn each day. The calculator uses the Mifflin-St Jeor equation for your basal metabolic rate, multiplied by your activity level.
