Ideal Body Weight Calculator (Height, Sex & Frame)
See what four standard formulas say your ideal weight is for your height — and the healthy BMI range, which is usually the more useful answer.
How it’s calculated
This applies the healthy BMI band to your height to give a weight range. Classic clinical equations are noted for comparison.
Healthy range(kg) = 18.5 to 24.9 × height(m)².
Devine (men) = 50 + 2.3 × inches over 5 ft; women = 45.5 + 2.3 × inches over 5 ft.
Source: WHO BMI categories; Devine/Robinson/Miller/Hamwi equations.
Ideal weight for women and men by height
The formulas all work the same way: a base weight at 152 cm (5 ft) plus a fixed amount per extra inch. Devine (1974), the one used in clinical dosing: men 50 kg + 2.3 kg per inch over 5 ft; women 45.5 kg + 2.3 kg per inch. Example: a 170 cm (5 ft 7 in) woman → 45.5 + 2.3×7 ≈ 61.6 kg. The calculator shows all four formulas side by side because they can differ by 3–5 kg.
Ideal body weight formulas
Hamwi (1964): men 48 kg + 2.7 kg/inch, women 45.5 + 2.2. Robinson (1983): men 52 + 1.9, women 49 + 1.7. Miller (1983): men 56.2 + 1.41, women 53.1 + 1.36. None of them accounts for muscle, frame or age; they were built for medication dosing and insurance tables, not for setting personal goals.
Adjusted body weight
Clinicians use adjusted body weight when actual weight is well above ideal: ABW = IBW + 0.4 × (actual − IBW). It is a dosing and nutrition-planning tool — for example when estimating protein needs — not a target to reach.
Ideal weight vs BMI
A healthy BMI (18.5–24.9) gives a range rather than a single number, which better reflects real bodies: for 170 cm that is about 53–72 kg. If the “ideal” formula number falls inside your healthy BMI range and you feel and perform well, there is nothing to fix. Use the BMI calculator for the range and the body fat calculator for composition.
Sources
- Pai MP, Paloucek FP. The origin of the “ideal” body weight equations. Ann Pharmacother 2000 (PubMed 10917373) — https://pubmed.ncbi.nlm.nih.gov/10917373/
- CDC, Adult BMI Calculator — https://www.cdc.gov/bmi/adult-calculator/index.html
- NHLBI BMI table — https://www.nhlbi.nih.gov/health/educational/lose_wt/BMI/bmi_tbl.htm
This calculator is educational and not medical advice. If you have a health condition, are pregnant, or are under 18, ask a clinician before changing your diet.
Related calculators
Waist-to-Hip Ratio (WHR) Calculator
Two tape measurements tell you where your body stores fat — and the WHO risk band that goes with it.
Body Fat Percentage Calculator (U.S. Navy Method)
Measure your waist, neck (and hips for women) with a tape and get a body fat estimate — no scale, no calipers.
Lean Body Mass & FFMI Calculator
Enter weight, height and body fat percentage to get your lean body mass in kg/lb and your FFMI — the muscle-per-height score.
BMI Calculator (Adults: Men & Women)
Enter your height and weight to get your BMI in seconds. Works in kg/cm or lbs/ft; the same categories apply to men and women aged 20+.
Protein Intake Calculator: How Much Protein Do You Need?
Enter your weight, activity and goal to get a daily protein target in grams — and see how it splits across meals.
Meal Calorie Calculator: Calories per Meal
Enter your daily calories and how many meals you eat; get a target for each meal, with protein, carbs and fat.
Daily Water Intake Calculator (By Weight & Activity)
A practical daily fluid target from your weight, activity and climate — in liters, ounces and cups.
Intermittent Fasting Calculator (16:8, 18:6, 20:4, OMAD)
Choose a fasting schedule and your first meal time; get your eating window and the calories to eat inside it.