Ideal Weight Calculator

Calculate your ideal body weight from height and gender using the Devine, Robinson, Miller, and Hamwi formulas. Get a healthy target weight range to guide your fitness goals with this free calculator.

Gender

How to Use

  1. Select gender

    Choose male or female.

  2. Enter height

    Input your height in centimeters (cm) or feet and inches.

  3. View results

    Compare ideal weight ranges from multiple medical formulas.

What is ideal body weight?

Ideal Body Weight (IBW) is the weight statistically considered suitable for maintaining health, based on a person's height and gender. It was originally devised in clinical settings during the 1960s–80s to calculate accurate drug dosages, and the four best-known formulas are Devine, Robinson, Miller, and Hamwi.

Ideal body weight is not a single correct answer—each formula yields a slightly different value—so it is best understood as a healthy weight range rather than one absolute standard. Use it as a reference when setting a diet goal, gauging how far your current weight is from the healthy range, or establishing a starting point for an exercise plan. Keep in mind that people with high muscle mass or unusual body composition may differ from their actual health status, so it is wise to view it alongside BMI and body fat percentage.

Calculation formula

Every formula uses a height of 60 inches (152.4 cm) as the baseline and adds a fixed amount of weight for each additional inch (2.54 cm) above it.

  • Devine male = 50 + 2.3 × (inches − 60)
  • Devine female = 45.5 + 2.3 × (inches − 60)
  • Robinson male = 52 + 1.9 × (inches − 60)
  • Hamwi male = 48 + 2.7 × (inches − 60)

Example: A man who is 175 cm tall is 175 ÷ 2.54 ≈ 68.9 inches, which is 8.9 inches above 60. Using the Devine formula, 50 + 2.3 × 8.9 ≈ 70.5 kg. Here, inches represent height, while constants like 50 and 2.3 are the coefficients for each gender and formula.

Frequently Asked Questions

What is ideal body weight?
It is the weight range considered suitable for maintaining health according to your height and gender. It is calculated using four medical formulas: Devine, Robinson, Miller, and Hamwi.
Which of the four formulas is most accurate?
The Devine formula is the most widely used in clinical practice, but none of them is absolutely accurate. It is recommended to use the average of the four results as your reference.
What is the difference between ideal weight and BMI?
BMI is an indicator of whether your current weight is in the obese range, while ideal weight suggests a healthy weight worth aiming for. Looking at both together gives a more accurate picture.
Why do the formulas give different results?
Each formula was published in a different era and based on a different study population, so the baseline weight and the per-inch increase coefficient differ. As a result, the same height can produce a difference of several kilograms between formulas—which is exactly why a healthy weight should be viewed as a 'range.'
Why is 60 inches (152 cm) the baseline?
All four formulas set the lower limit of adult height at about 5 feet (60 inches, 152.4 cm) and add weight for each inch above that. So if your height is 152 cm or less, the result stays close to the base value.
Is it accurate for people with high muscle mass?
Ideal weight formulas use only height and gender, so they cannot account for muscle mass. Athletes or muscular individuals may exceed their ideal weight even while being genuinely healthy, so it is best to also check body fat percentage.
If I don't reach my ideal weight, am I unhealthy?
Not necessarily. Ideal weight is a statistical reference, and individual variation of about ±10% is natural. Overall health indicators such as body fat percentage, waist circumference, and activity level matter more than weight itself.
How do I use it to set a weight-loss goal?
Use the average of the four values as your initial goal, but rather than reaching it all at once, it is safer to reduce your current weight gradually by 5–10% at a time. Rapid weight loss can cause muscle loss and yo-yo rebound.
Updated 2026 — WHO standards

Related Calculators

BMI CalculatorBMI=weight(kg)/height(m)^2Calorie CalculatorMifflin-St Jeor BMR × 활동계수 = TDEEBMR CalculatorMifflin-St Jeor + Harris-Benedict 비교Body Fat CalculatorNavy: %BF=86.010xlog10(waist-neck)-70.041xlog10(height)+36.76