What BMI is a healthy weight?

18.5 to 24.9 kg/m² is the standard healthy band for adults — the calculator converts it into an actual weight range for your height.

Why do the formula estimates differ from the BMI range?

Formulas like Devine were designed for drug dosing and produce a single point, while the BMI range is a band — a 5–8 kg difference between them is normal.

Healthy Weight Calculator

Computes the healthy body weight range for a given height based on the standard BMI bands, then maps out the weight thresholds for underweight, overweight and obesity, with popular formula estimates (Devine, Robinson, Miller) for comparison.

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Live calculate

Presets

Unit System

Metric (cm)Imperial (ft + in)

Enter your values in the matching fields — the other unit set is ignored.

Height

Height (feet)

Height (inches)

Live mode: results update as you type.

Healthy Weight Range (BMI 18.5–24.9)

59.9 – 80.7 kg

132 – 178 lb at 180.0 cm — most accurate for adults 18+

Height: 180.0 cm
Healthy range: 59.9 – 80.7 kg
Overweight begins at (BMI 25): ≥ 81.0 kg (179 lb)
Obesity begins at (BMI 30): ≥ 97.2 kg (214 lb)
Devine formula (male): 75.0 kg (165 lb)
Devine formula (female): 70.5 kg (155 lb)

Weight ranges by BMI category (for this height)

BMI category	BMI range	Weight range
Underweight	< 18.5	< 59.9 kg (132 lb)
Healthy / Normal	18.5 – 24.9	59.9 – 80.7 kg
Overweight	25.0 – 29.9	81.0 – 97.1 kg
Obese	≥ 30.0	≥ 97.2 kg

Ranges assume average adult body composition — muscular people can read "overweight" while perfectly healthy.

Formula-based estimates (comparison)

Formula	Male	Female
Devine (1974)	75.0 kg (165 lb)	70.5 kg (155 lb)
Robinson (1983)	72.6 kg (160 lb)	67.5 kg (149 lb)
Miller (1983)	71.5 kg (158 lb)	67.9 kg (150 lb)

Formula values apply to adults over 5 ft tall; they are clinical dosing heuristics rather than fitness targets.

A healthy weight depends on body composition, not height alone. Estimates for informational purposes only — not medical advice.

Most useful next

Formula

Weight = BMI × height (m)² · healthy band BMI 18.5–24.9 · Devine: 50 kg + 2.3 kg per inch over 5 ft (male)

• Convert height to meters and square it.
• Multiply by the BMI band edges: 18.5 and 24.9 for the healthy range, 25 and 30 for the overweight/obesity thresholds.
• Formula estimates (Devine 50/45.5 kg + 2.3 kg per inch over 5 ft) are shown for side-by-side comparison.

Pro tips

• BMI ignores muscle mass — athletes often land in the overweight band at very healthy body-fat levels.
• Waist circumference (< 40 in men, < 35 in women) adds risk context beyond the scale.
• Recompute after height changes (growth) but expect the range to stay stable in adulthood.

FAQ

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Healthy Weight Calculator

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BMI category

BMI range

Weight range

Underweight

< 18.5

< 59.9 kg (132 lb)

Healthy / Normal

18.5 – 24.9

59.9 – 80.7 kg

Overweight

25.0 – 29.9

81.0 – 97.1 kg

Obese

≥ 30.0

≥ 97.2 kg

Formula

Male

Female

Devine (1974)

75.0 kg (165 lb)

70.5 kg (155 lb)

Robinson (1983)

72.6 kg (160 lb)

67.5 kg (149 lb)

Miller (1983)

71.5 kg (158 lb)

67.9 kg (150 lb)

Formula

Weight = BMI × height (m)² · healthy band BMI 18.5–24.9 · Devine: 50 kg + 2.3 kg per inch over 5 ft (male)

• Convert height to meters and square it.

• Multiply by the BMI band edges: 18.5 and 24.9 for the healthy range, 25 and 30 for the overweight/obesity thresholds.

• Formula estimates (Devine 50/45.5 kg + 2.3 kg per inch over 5 ft) are shown for side-by-side comparison.