CalcPenguin

Ideal Weight Calculator

See the ideal weight for your height from the Devine, Robinson, Miller and Hamwi formulas, next to the healthy BMI range.

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cm

The classic formulas are designed for adults 152 cm (5 ft) and taller.

Ideal weight (Devine)

70.5 kg

Healthy BMI range
56.7 to 76.3 kg
Robinson
68.9 kg
Miller
68.7 kg
Hamwi
72 kg

For a man of 175 cm, the formulas give 68.7 to 72 kg, and a healthy BMI allows 56.7 to 76.3 kg.

How it's worked out

  1. Inches over 5 feet175 cm ÷ 2.54 − 608.9
  2. Devine50 + 2.3 × 8.970.5 kg
  3. Healthy BMI range (18.5 to 24.9)18.5 × 1.75² to 24.9 × 1.75²56.7 to 76.3 kg
  • These formulas were made for dosing medicines, not as weight targets. The BMI range is the more practical guide; frame and muscle matter too.

The Devine formula

Men: 50 kg + 2.3 kg × inches over 5 ft · Women: 45.5 kg + 2.3 kg × inches over 5 ft

Worked example

A man 175 cm tall is 8.9 inches over 5 feet, so Devine gives 50 + 2.3 × 8.9 = 70.5 kg. A healthy BMI at that height is 56.7 to 76.3 kg.

Questions people ask

What is my ideal weight?

There's no single number. The classic formulas give a narrow figure; a healthy BMI of 18.5 to 24.9 gives a wider, more useful range.

Which formula is best?

Devine's is the most used, mainly for medicine doses. For everyday goals, the healthy BMI range is a better guide.

Does muscle change my ideal weight?

Yes. Muscular people can be healthy above these figures; body fat percentage is a better check.

Formula and rules last checked 25 October 2026Written and tested by the CalcPenguin teamReport a problem