Our ideal weight calculator runs all 7 formulas simultaneously. Understanding each helps you interpret your results — different formulas suit different body types and goals.
The most widely used formula in medicine — originally developed for drug dosing calculations. Our ideal weight calculator for men uses this as the primary reference.
Tends to give slightly lower results than Devine. Often considered more accurate for women. Used in our ideal weight calculator female as the comparison baseline.
Gives the lowest ideal weight of all formulas — best for people with smaller frames. The gap between Miller and Devine is typically 3–5 kg for average heights.
Commonly used by registered dietitians. Results fall between Devine and BMI-based methods. Our body ideal weight calculator shows Hamwi alongside all others.
Our free ideal weight calculator is more complete than calculator.net, OmniCalculator, and myDr — because it runs all 7 proven formulas simultaneously (Devine, Robinson, Miller, Hamwi, BMI-based, Broca, and Lean Body Mass), adjusts for body frame size (small/medium/large) using a ±10% modifier, includes an African American ideal weight calculator adjustment, a full bodybuilding ideal weight calculator using the Steve Reeves formula, and separate dog ideal weight calculator and cat ideal weight calculator modes. Results are shown in kg and lbs, with the healthy weight range for your height, BMI at ideal weight, and a comparison of all formula results.
Our ideal weight calculator female, ideal weight calculator for women, and ideal weight calculator in kg female use female-specific formula constants. For a woman at 5'5" (165cm) with medium frame: Devine = 54.7kg, Robinson = 57.2kg, Miller = 53.1kg, Hamwi = 54.0kg, BMI-based = 61.4kg, average ≈ 56kg. Women naturally have higher body fat percentage than men at the same weight — the ideal weight formulas account for this through different baseline constants. The women bmi ideal weight calculator range for 165cm is 50.4–68.0kg (BMI 18.5–24.9).
Our ideal weight calculator for men, ideal weight calculator men, and ideal weight calculator male use male formula constants, which produce higher ideal weights than female formulas at the same height. For a man at 5'10" (178cm) medium frame: Devine = 73.0kg, Robinson = 71.4kg, Miller = 68.4kg, Hamwi = 74.4kg, BMI-based = 77.2kg, average ≈ 73kg. Our ideal weight calculator in kg male shows all results and the healthy BMI-based range. Very muscular men may have an ideal weight calculator with muscle result that's 5–15kg above standard formulas — use Bodybuilding mode for this.
Female, 5'5" (165cm), medium frame:
Devine: 45.5 + 2.3×(65−60) = 45.5 + 11.5 = 57.0 kg
Robinson: 49 + 1.7×(65−60) = 49 + 8.5 = 57.5 kg
Healthy range: 50.4–68.0 kg · Average all formulas ≈ 56 kg
Male, 5'10" (178cm), medium frame:
Devine: 50 + 2.3×(70−60) = 50 + 23 = 73.0 kg
Robinson: 52 + 1.9×(70−60) = 52 + 19 = 71.0 kg
Healthy range: 56.7–76.5 kg · Average all formulas ≈ 72 kg
The African American ideal weight calculator applies a +3kg adjustment to the Devine formula results. Research published in the American Journal of Clinical Nutrition found that African Americans tend to have higher bone mineral density and muscle mass than other ethnic groups at the same height and weight. This means standard ideal weight formulas may slightly underestimate healthy weight for African Americans. Our calculator applies this evidence-based adjustment when you select "African American" from the formula adjustment dropdown.
Our ideal weight calculator bodybuilding and ideal weight calculator with muscle mode uses the Steve Reeves formula: Ideal weight (lbs) = Wrist circumference (inches) × 10. This formula estimates your maximum muscular potential at a lean body composition. A 7" wrist = 170 lbs (77kg) ideal bodybuilding weight. The result is then adjusted for your body fat percentage goal: at 5–8% body fat (competition), at 10–12% (athletic), at 15% (fit/natural), or 20% (off-season bulk). The advanced Casey Butt formula incorporates both wrist and ankle measurements for maximum natural muscle potential calculation.
The most accurate dog ideal weight calculator uses the Body Condition Score (BCS) on a 1–9 scale, not just breed averages. BCS 4–5 is ideal: ribs easily felt but not visible, a visible waist from above, and an abdominal tuck when viewed from the side. If your dog has a BCS of 6 or above (ribs hard to feel), they're overweight. Formula for estimated ideal weight: Ideal weight = Current weight × (9 − current BCS) ÷ (9 − 4.5). For BCS 7 dog at 25kg: Ideal = 25 × (9−7) ÷ (9−4.5) = 25 × 2/4.5 = 11.1kg — which is why vet-guided weight loss for obese dogs is so critical.
Important limitation of ideal weight formulas: No formula accounts for muscle mass. An athlete or bodybuilder with 10% body fat may show as "overweight" on standard ideal weight calculations — they're clearly not. Conversely, a sedentary person at their "ideal weight" by formula may still have high body fat percentage (normal weight obesity). Use these formulas as a starting range, not as an absolute health verdict. Our ideal weight calculator with muscle / bodybuilding ideal weight calculator mode provides a more appropriate target for athletes.
Questions covering ideal weight formulas, frame size adjustment, African American IBW, dog and cat ideal weight, and bodybuilding weight targets.
No single formula is universally most accurate — each was developed for specific populations. The Devine formula (1974) is most widely used in clinical medicine for drug dosing and drug calculations. The Robinson formula is often considered more accurate for women. The BMI-based ideal weight (using BMI 22.5, the midpoint of healthy 18.5–24.9 range) captures the healthy weight range most precisely. Our body ideal weight calculator and my ideal weight calculator runs all 7 formulas so you can see the consensus average — which is typically the most balanced estimate. For most adults, the range between the lowest and highest formula result is 5–10 kg.
Our body frame size and ideal weight calculator and ideal weight calculator frame size applies: Small frame = IBW − 10%. Large frame = IBW + 10%. For a woman at 5'5" with medium-frame IBW of 57kg: small frame ideal = 51.3kg, large frame ideal = 62.7kg — an 11.4kg difference for the same height. Measure your wrist to determine frame size: Men: small <16.5cm (6.5"), medium 16.5–19cm (6.5–7.5"), large >19cm (7.5"). Women: small <14cm (5.5"), medium 14–16.5cm (5.5–6.5"), large >16.5cm (6.5"). Frame size reflects bone density and skeletal mass, which genuinely affects healthy weight.
To find what is my ideal weight calculator result: 1) Enter your gender and height in the calculator above. 2) Select your body frame size (measure wrist if unsure — default to Medium). 3) Click Calculate Ideal Weight. You'll see results from 7 formulas, the healthy BMI range for your height (18.5–24.9), and the consensus average. A practical approach: the healthy BMI range gives you a 10–15kg window, and most formula results fall somewhere in that window. Your personal ideal weight is wherever within that range you feel and perform best — it's not a single number.
Our African American ideal weight calculator adds approximately 3kg (+6.6 lbs) to the standard Devine formula result. Research has shown that African Americans typically have higher bone mineral density (approximately 5–10% greater) than European Americans, which means their skeletal mass weighs more at the same height — making standard IBW formulas slightly underestimate appropriate weight. The original research supporting this adjustment was published in the American Journal of Clinical Nutrition. Select "African American" from the Formula Adjustment dropdown in our ideal weight calculator above to apply this ethnic-specific adjustment to all 7 formulas.
Our dog ideal weight calculator uses breed size ranges and the Body Condition Score (BCS) method. BCS is assessed on a 1–9 scale: 1–3 = underweight, 4–5 = ideal, 6–7 = overweight, 8–9 = obese. At BCS 4–5, you should be able to easily feel (but not see) your dog's ribs, see a visible waist from above, and see an abdominal tuck from the side. If your dog is overweight (BCS 6+), you can estimate ideal weight using: Ideal weight = Current weight ÷ (1 + % overweight). Generally, overweight dogs need 1–2% of body weight lost per week. Switch to Dog mode in our dog ideal weight calculator above and enter your dog's current weight and BCS for a personalized ideal weight estimate.
Our ideal weight calculator bodybuilding and ideal weight calculator with muscle mode uses the Steve Reeves formula: Ideal weight (lbs) = Wrist circumference (inches) × 10. This was developed to predict maximum muscular potential at a lean body composition. For a person with a 7-inch wrist: 7 × 10 = 170 lbs (77 kg) ideal bodybuilding weight. At 5–8% body fat (competition): this is the stage-ready weight. At 15% body fat (natural/fit): add ~10% to account for body fat. Our bodybuilding ideal weight calculator adjusts based on your selected body fat percentage goal. Standard medical formulas (Devine, Robinson) are not appropriate for bodybuilders — they'll always show them as overweight due to high muscle mass.