Looking for a ideal body weight calculator by height? This free tool gives you Robinson, Miller, Devine and Hamwi formulas plus BMI range. Just enter your numbers and press Calculate — results are instant.
There is no single ideal weight: four classic formulas (Robinson, Miller, Devine and Hamwi) each give a slightly different answer from your height, because they were built for different purposes — mostly for drug dosing. This calculator shows all four side by side, plus the healthy weight range that comes from a BMI of 18.5 to 24.9, which is the range most doctors use. Treat the formulas as a guide, not a target you must hit exactly.
Example: Male · Height 175 cm
Healthy BMI Range (18.5–24.9): 56.7 – 76.3 kg
They were built for different purposes — mostly drug dosing — and each fitted its own data. Robinson, Miller, Devine and Hamwi disagree by a few kilograms, which is why the calculator shows all four plus the BMI healthy range.
None of them exactly. The healthy BMI range (18.5–24.9) is the range doctors use most, and it is wider and more forgiving than any single formula. Treat the formulas as a rough guide.
No. Frame size, muscle, age and health all shift what is healthy for you. Two people of the same height can have different healthy weights.