Smart Calculator Pro

Smart Calculator Pro

HomeFinanceHealthMathConstructionEveryday LifeGuidesCompare
Free toolsReviewable pages

Ideal Weight Calculator

Find your ideal body weight using four established medical formulas. Compare results from Hamwi, Devine, Robinson, and Miller methods side by side and see your healthy weight range at a glance.

Your biological sex. Each formula uses different base weights and increments for men and women.

Your height in inches. All four formulas use height as the primary input.

This calculator estimates your ideal body weight using four widely referenced formulas developed for clinical use. Each formula produces a slightly different result because they were derived from different population studies. The calculator averages all four and provides a healthy weight range so you can see the full picture rather than fixating on a single number.

How It Works

Four Ideal Body Weight Formulas

IBW = Base Weight + (Height Increment x Inches Over 5 ft)

Each formula starts with a base weight for someone who is 5 feet tall and adds a fixed amount for each inch above 5 feet.

Hamwi (1964): Men = 106 + 6 x (inches over 60), Women = 100 + 5 x (inches over 60)

Devine (1974): Men = 110.23 + 5.07 x (inches over 60), Women = 100.31 + 5.07 x (inches over 60)

Robinson (1983): Men = 115.06 + 4.18 x (inches over 60), Women = 108.03 + 3.64 x (inches over 60)

Miller (1983): Men = 123.98 + 3.06 x (inches over 60), Women = 115.67 + 2.81 x (inches over 60)

The average and range are computed from all four results

Important Notes:

  • •These formulas were originally developed for clinical drug dosing, not as weight loss targets
  • •They do not account for body composition, frame size, or muscle mass
  • •The range across all four formulas gives a more realistic picture than any single number
  • •BMI-based healthy weight ranges may be a useful complement to these formulas

Worked Example

A male who is 70 inches (5 feet 10 inches) tall.

Inputs:

  • gender:Yes
  • height:70

Result:

Hamwi: 166 lbs, Devine: 161 lbs, Robinson: 157 lbs, Miller: 155 lbs. Average ideal weight is approximately 160 lbs, with a range of 155 to 166 lbs.

Who Is This Calculator For?

  • people setting weight goals
  • fitness beginners
  • anyone wondering how much they should weigh
  • healthcare awareness

Frequently Asked Questions

Each formula was developed by different researchers using different study populations. They were originally created for clinical purposes like calculating drug doses rather than setting weight loss goals. Showing all four gives you a range instead of a single misleading number.
No single formula is considered the most accurate for everyone. The Devine formula is the most commonly used in clinical settings. For a practical approach, look at the range across all four formulas rather than relying on one.
Not exactly. Ideal body weight formulas are simplified estimates based on height and gender. Healthy weight depends on many more factors including body composition, fitness level, family history, and overall health markers. A BMI in the 18.5 to 24.9 range is one commonly used healthy weight guideline.
These formulas do not account for muscle mass. Muscle is denser than fat, so muscular people often weigh more than formula estimates while being very healthy. If you strength train regularly, use body fat percentage as a more meaningful metric.
These formulas are designed for adults at least 5 feet (60 inches) tall. For heights below 60 inches, the formulas may produce inaccurate results. Consult a healthcare provider for personalized guidance.
Neither specifically. The range shows you a reasonable target zone. Where you feel best within that range depends on your body frame, muscle mass, and personal health goals. Focus on overall health markers rather than hitting an exact number.

Related Tools

Last updated: April 20, 2026