170 cm male: (66.9 − 60) × 2.3 + 50 = 65.9 kg, range 59.3–72.5.
155 cm female: (61.0 − 60) × 2.3 + 45.5 = 47.8 kg.
More: limits of the formula
Devine (1974) was made for drug dosing, not as a definition of health. Modern assessment combines BMI, waist and body-fat measures. If the number worries you, talk to a doctor.
Frequently asked questions
What is the ideal-weight formula?
Devine: men 50 + 2.3 × (inches − 60), women 45.5 + 2.3 × (inches − 60), where inches is height above 5 feet.
How is this different from BMI?
BMI judges your current weight; ideal weight suggests the target. Use both — see the BMI calculator.
What if I am under 5 feet?
The 5-foot value is used: 50 kg for men, 45.5 kg for women.
Does it apply to everyone?
No. Muscular or athletic people can be healthy above it. Treat it as a guide.
How is the healthy range set?
±10% of the ideal. For 65.9 kg the range is 59.3–72.5 kg.