Ideal Weight Calculator

Find your ideal body weight using five established medical formulas

Your Measurements

Height 170 cm

100 cm220 cm

Current Weight 75 kg

30 kg250 kg

Age 30 yrs

18100

yrs

Body Frame Size

Frame size adjusts Hamwi formula by ±10%. Determine by wrapping your thumb and index finger around your wrist: overlap = small, touch = medium, gap = large.

Ideal Weight (Average of 5 Formulas)

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Enter your measurements above

Ideal Weight

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Current Weight

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Difference

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BMI Range

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Calculate above to see your status

// Your Weight vs Healthy Range

UnderweightHealthyOverweightObese

// Progress Toward Ideal Weight

Current weight —

Current: — Gap: — Ideal: —

// All 5 Formulas

Calculate above to see formula results

// BMI Healthy Weight Range (18.5–24.9)

Minimum (BMI 18.5) —

Midpoint (BMI 21.7) —

Maximum (BMI 24.9) —

Your current BMI —

To reach healthy BMI — lose/gain —

What Is Ideal Body Weight?

Ideal Body Weight (IBW) formulas were originally developed in clinical settings to estimate appropriate medication dosages and anaesthetic amounts. Over time they became widely used as reference points for healthy weight ranges, though none of them account for muscle mass, bone density, or individual variation.

The Five Formulas

All formulas use height in inches above 5 feet (hIn = total inches − 60): Hamwi (1964) — widely used in clinical nutrition: Male: IBW = 48.0 + 2.7 × hIn Female: IBW = 45.5 + 2.2 × hIn Adjust ±10% for small/large frame Devine (1974) — most commonly cited formula: Male: IBW = 50.0 + 2.3 × hIn Female: IBW = 45.5 + 2.3 × hIn Robinson (1983) — refined from Devine: Male: IBW = 52.0 + 1.9 × hIn Female: IBW = 49.0 + 1.7 × hIn Miller (1983) — tends to give higher values: Male: IBW = 56.2 + 1.41 × hIn Female: IBW = 53.1 + 1.36 × hIn BMI Range (WHO): Healthy range = BMI 18.5–24.9 IBW midpoint = BMI 21.7 × height(m)² All results in kg. 1 kg = 2.205 lb

Which Formula Should I Use?

There is no universally "correct" formula — they were each developed for different purposes. The Devine formula is the most widely cited and used. The average of all five formulas (shown as your result) gives a reasonable central estimate. The BMI healthy range (18.5–24.9) is the most commonly used modern reference.

Limitations

These formulas were developed on limited populations and do not account for muscle mass, age-related body composition changes, ethnicity, or individual variation. A bodybuilder may have an "above ideal" weight while being very lean. A sedentary person may be within range while carrying excess fat. Use these figures as a general guide, not a target to obsess over.

Disclaimer: CalculatorXP health calculators are for informational purposes only and do not constitute medical advice. Ideal weight formulas are general guidelines and do not account for individual variation in muscle mass, bone density, or health status. Always consult a healthcare professional for personalised guidance.

// Not a Magic Number

Ideal weight formulas were designed for medication dosing, not as strict health targets. A range is always more meaningful than a single number.

// BMI Range Preferred

The WHO BMI healthy range (18.5–24.9) is the most widely used modern reference. It gives a weight range rather than a single target.

// Muscle vs Fat

A muscular person may be "above ideal" weight while being very healthy. These formulas cannot distinguish muscle from fat.

// Focus on Health

Energy levels, sleep quality, blood pressure and fitness are better health indicators than hitting an exact weight target.