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Find your ideal weight range in kg and lb using the Robinson, Miller, Devine and Hamwi formulas alongside the BMI 18.5-24.9 healthy band for men and women.
Health
Generated on July 8, 2026
Find your ideal weight range in kg and lb using the Robinson, Miller, Devine and Hamwi formulas alongside the BMI 18.5-24.9 healthy band for men and women.
An ideal weight calculator estimates a healthy weight range for your height using multiple medically validated formulas — Robinson, Miller, Devine, and Hamwi — alongside the BMI-based healthy range (18.
Formula
Robinson (male): 52 kg + 1.9 kg × (height in inches − 60). Formulas differ slightly for females and between authors. BMI range: (18.5–24.9) × height²(m).Every wedding season, every Eid run-up, somebody in the family hands around a number — 'you should be 65 kilos by your nikah' — and suddenly you're staring into a calculator looking for the magic ideal weight. Here's what nobody tells you: there isn't one number. There's a range, and four different medically validated formulas (Robinson, Miller, Devine, Hamwi) will disagree by 5 to 7 kilos for the same height. That disagreement is the point. It means 'ideal weight' is genuinely a 10 to 20 kilo band depending on your frame, muscle mass, ancestry, and where you carry weight. The Devine formula gets used in hospitals because it was originally written to calculate chemo dosages — not because it's a wellness target. So treat these numbers as a sanity check, not a goal. A South Asian frame typically carries cardiovascular risk at slightly lower weights than European norms, so the WHO has quietly suggested adjusting Asian thresholds downward — your GP almost certainly already knows. Pro tip: if you're lifting weights or you have a wider skeletal frame, the formula will tell you that you're 'overweight' when you're actually in the best shape of your life. Cross-check with waist measurement (under half your height is the cleanest rule), and please don't crash-diet to hit a number a 1974 formula thinks you should be.
An ideal weight calculator estimates a healthy weight range for your height using multiple medically validated formulas — Robinson, Miller, Devine, and Hamwi — alongside the BMI-based healthy range (18.5–24.9). These classical formulas were originally developed for medication dosing (where body weight matters for dose calculation) but have been adopted widely as healthy-weight references. Showing several formulas together reveals that 'ideal weight' is a range, not a single number — different methods give slightly different values because they were developed with different populations and assumptions.
All four classic formulas start from a baseline weight at 5 ft (60 inches) height and add a fixed increment per inch above that baseline. The four authors (Robinson, Miller, Devine, Hamwi) derived slightly different baselines and increments from different study populations, so their numbers differ by a few kilograms. The BMI-based range covers all weights that yield BMI 18.5–24.9 for a given height, which is the widest-accepted modern definition of healthy-weight range.
Reference ideal body weights for common adult heights. Values are mid-range estimates from the Devine formula.
| Height | Male Ideal (kg) | Male Ideal (lb) | Female Ideal (kg) | Female Ideal (lb) |
|---|---|---|---|---|
| 5'0" (152 cm) | 50.0 | 110.2 | 45.5 | 100.3 |
| 5'3" (160 cm) | 56.7 | 125.0 | 52.2 | 115.1 |
| 5'5" (165 cm) | 61.2 | 134.9 | 56.7 | 125.0 |
| 5'7" (170 cm) | 65.8 | 145.0 | 61.2 | 134.9 |
| 5'9" (175 cm) | 70.3 | 155.0 | 65.8 | 145.0 |
| 5'11" (180 cm) | 74.8 | 164.9 | 70.3 | 155.0 |
| 6'1" (185 cm) | 79.4 | 175.0 | 74.8 | 164.9 |
| 6'3" (190 cm) | 83.9 | 184.9 | 79.4 | 175.0 |
Ideal weight formulas give ranges, not targets — a ±5 kg spread is normal for the same height.
The original Devine formula was created in 1974 for medication dosing, not aesthetic ideals — use with context.
Athletes often exceed 'ideal weight' due to muscle mass, yet remain very healthy — BMI and ideal weight both miss this.
Asian populations typically carry cardiovascular risk at ~2–3 kg below the standard ideal weight — factor ethnicity in.
A 175 cm male: Robinson ≈ 70 kg, Miller ≈ 74 kg, Devine ≈ 72 kg, Hamwi ≈ 75 kg, BMI range 56.7–76.3 kg — a span of roughly 20 kg.
A 165 cm female: Robinson ≈ 57 kg, Devine ≈ 57 kg, Miller ≈ 60 kg, BMI range 50.4–67.8 kg — showing the importance of seeing a range.
A 180 cm male: Robinson ≈ 73.5 kg, Miller ≈ 77 kg, Hamwi ≈ 79 kg.
A 155 cm female: Robinson ≈ 53.5 kg, Devine ≈ 50 kg, BMI range 44.4–59.8 kg.
A tall 190 cm man has a wide healthy range of approximately 67 to 90 kg under BMI guidelines — different body frames naturally sit in different spots within that range.
A short 150 cm adult has a narrower range (42–56 kg) but same principle applies — frame size and muscle mass determine where within the range is 'right'.
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