Health & Fitness Calculators

Ideal Weight Estimator

There is no single perfect weight, so this tool shows the results of four widely used formulas next to the healthy BMI range for your height. Treat them as a broad guide, not a target you must hit.

Units
Sex
cm
Average of the four formulas70 kg
Devine formula
70.5 kg
Robinson formula
68.9 kg
Miller formula
68.7 kg
Hamwi formula
72 kg
Healthy BMI range (18.5–24.9)
56.7 kg – 76.3 kg
Step-by-step working
  1. Height = 68.9 in, which is 8.9 in over 5 ft
  2. Devine: 50 + 2.3 × 8.9 = 70.5 kg

How to use the Ideal Weight Estimator

  1. Choose units and sex.
  2. Enter your height.
  3. Press Calculate.

Formula

Each formula starts with a base weight for 5 ft (152.4 cm) and adds a fixed amount per inch above that. Devine (1974): men 50 kg + 2.3 kg/in; women 45.5 kg + 2.3 kg/in.

Examples

  • Man, 175 cm (68.9 in): Devine 70.5 kg, Robinson 68.9 kg, Miller 68.7 kg, Hamwi 72.0 kg.

Frequently asked questions

Why are the formulas different?

They come from different studies and were originally meant for estimating drug doses, not personal goals. Their spread shows how wide a healthy weight can be.