Healthy Weight Calculator
Enter your height to find your healthy weight range (BMI 18.5–24.9). Enter your current weight to see exactly where you stand and how far you are from the range boundaries.
cm
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Enter your values above to see the results.
Tips & Notes
- ✓The healthy range spans roughly 15–23 kg depending on height. You do not need to hit a specific number — anywhere in the range is clinically considered healthy.
- ✓The midpoint of the healthy range (BMI ~21.7) is not "more healthy" than the upper end — research shows mortality risk is similar across the full 18.5–24.9 range for most adults.
- ✓For adults over 65, some research suggests the upper half of the healthy range or slightly above (BMI 25–27) may be associated with better survival outcomes.
- ✓If you are in the healthy range but have a waist circumference above 94 cm (men) or 80 cm (women), address waist size alongside weight — visceral fat is a separate risk factor.
- ✓Sustainable weight loss of 0.25–0.5 kg per week preserves lean mass better than aggressive deficits. For every 10 kg you need to lose, budget approximately 5–10 months.
Common Mistakes
- ✗Targeting the bottom of the healthy range as a goal when the current weight is in the upper part — any point in the range is healthy, and the lower end is not superior for most adults.
- ✗Not accounting for muscle mass — athletes often have BMI near or above 25 due to lean mass and are not overweight despite falling outside the range.
- ✗Losing weight faster than 0.5 kg per week, which disproportionately reduces lean mass and slows metabolism, making long-term maintenance harder.
- ✗Treating the healthy weight range as the only health metric — waist circumference, blood pressure, and metabolic markers matter independently of whether you are in range.
- ✗Using the standard adult healthy weight range for children and adolescents, who require age- and sex-specific growth chart percentiles.
Healthy Weight Calculator Overview
Knowing your healthy weight range gives a concrete, evidence-based target rather than an abstract goal. It answers the question: "What should I weigh?" with a range that applies specifically to your height.
Healthy weight range formula:
Healthy weight range uses the WHO BMI boundaries: Lower bound = 18.5 × height (m)² Upper bound = 24.9 × height (m)²
EX: Person is 168 cm tall (1.68 m) Lower bound = 18.5 × (1.68)² = 18.5 × 2.8224 = 52.2 kg Upper bound = 24.9 × (1.68)² = 24.9 × 2.8224 = 70.3 kg Healthy range: 52.2 – 70.3 kg (a window of 18.1 kg) If current weight is 78 kg: 7.7 kg above the healthy upper boundary
Calculating distance from healthy range and timeline:
Distance to range (if outside): To upper boundary = current weight − upper bound (if overweight) To lower boundary = lower bound − current weight (if underweight) Rate of healthy loss: 0.25–0.5 kg per week = 6–12 months per 10 kg
EX: Person weighs 85 kg, height 170 cm, upper boundary 72.0 kg Distance to healthy range = 85 − 72 = 13 kg above upper bound At 0.5 kg/week: approximately 26 weeks (6.5 months) to reach healthy range At 0.25 kg/week: approximately 52 weeks (13 months) — more sustainable for most people
Healthy weight ranges by height — quick reference:
| Height | Healthy Min (kg) | Healthy Max (kg) | Range width (kg) |
|---|---|---|---|
| 155 cm (5 ft 1 in) | 44.4 | 59.8 | 15.4 |
| 160 cm (5 ft 3 in) | 47.4 | 63.7 | 16.3 |
| 165 cm (5 ft 5 in) | 50.4 | 67.8 | 17.4 |
| 170 cm (5 ft 7 in) | 53.5 | 71.9 | 18.4 |
| 175 cm (5 ft 9 in) | 56.7 | 76.3 | 19.6 |
| 180 cm (5 ft 11 in) | 59.9 | 80.6 | 20.7 |
| 185 cm (6 ft 1 in) | 63.3 | 85.2 | 21.9 |
| 190 cm (6 ft 3 in) | 66.8 | 89.9 | 23.1 |
BMI population-specific thresholds:
| Health marker | What healthy range predicts | Additional check needed |
|---|---|---|
| Cardiovascular risk | Moderate reduction vs overweight | Waist under 94 cm (M) / 80 cm (F) |
| Type 2 diabetes risk | Lower than overweight or obese BMI | Fasting glucose below 5.6 mmol/L |
| Sleep quality | Lower sleep apnea prevalence | Neck circumference under 43 cm (M) |
| Joint health | Lower osteoarthritis burden | Activity level and muscle strength |
| All-cause mortality | Lower risk across most ages | Smoker status, fitness level modify estimate |
The healthy weight range is the most defensible answer to "what should I weigh" because it is derived from the broadest population evidence base. It also acknowledges a clinical reality: metabolic health exists on a continuum. Someone at the upper end of the healthy range (BMI 24) with high fitness, good waist circumference, and normal blood pressure is genuinely healthy. Someone at BMI 22 who smokes, is sedentary, and has poor metabolic markers is less so. The range gives you the target; lifestyle, body composition, and metabolic markers determine your actual health within it.
Frequently Asked Questions
The healthy weight range (based on BMI 18.5–24.9) is a broad, evidence-based window derived from population health data covering millions of people. Ideal weight formulas (Devine, Robinson, Miller, Hamwi) are single-point estimates developed in the 1960s–80s for clinical drug dosing purposes. In practice, the ideal weight formulas typically produce values that fall within the lower half of the BMI healthy range. The healthy weight range is a more honest and inclusive target for most people because it acknowledges that bodies naturally vary in size.
Absolutely. Metabolic health exists on a continuum that BMI does not fully capture. "Normal weight obesity" — normal BMI with high body fat and low muscle — carries real cardiovascular risk. Additionally, lifestyle factors like smoking, sedentary behavior, poor sleep, and chronic stress affect health independently of weight. Conversely, someone slightly above the healthy range with excellent fitness, normal blood pressure, healthy blood glucose, and good cholesterol is in better overall health than their BMI would suggest.
At a sustainable rate of 0.5 kg per week (a 500-calorie daily deficit), every 10 kg takes approximately 20 weeks (5 months). At 0.25 kg per week (a 250-calorie deficit, very sustainable), every 10 kg takes about 40 weeks. Research consistently shows that slower weight loss preserves more lean mass and is more likely to be maintained long-term. If you need to lose more than 20 kg to enter the healthy range, realistic timelines are 12–24 months. Working with a registered dietitian improves both the rate and sustainability.
Some people naturally have very low BMI due to genetics, high metabolic rate, or lean body type without any health problems. If you have always been at the lower end of or slightly below the healthy range, feel energetic, have normal blood work, and have not lost weight unintentionally, this may simply be your natural baseline. However, BMI below 18.5 is associated with reduced bone density, immune function, and in women, hormonal disruption. Unintentional weight loss pushing BMI below 18.5 always warrants medical evaluation.
The BMI formula and the 18.5–24.9 healthy range apply equally to adult men and women of the same height. However, within that range, men and women naturally carry weight differently — women have higher essential fat (10–13% vs 3–5% for men) and tend to store fat in the hips and thighs, while men more commonly store it abdominally. At the same BMI, women typically have a higher body fat percentage than men. This is physiologically normal and not a health disadvantage.
If you are significantly above the healthy range (BMI above 30), the most evidence-based starting point is a moderate calorie deficit of 300–500 kcal below your TDEE, combined with resistance training to preserve lean mass, and adequate protein (1.6–2.0 g per kg body weight). If you are significantly below the range (BMI below 17), gaining weight requires a calorie surplus of 300–500 kcal above maintenance, with protein and resistance training to ensure most of the gain is lean mass. In both cases, consultation with a doctor and registered dietitian provides the safest, most personalized path.