Healthy Weight Calculator

"Healthy weight" is defined by the World Health Organization as the weight that places you in the BMI 18.5–24.9 range. Statistically, adults in this band have the lowest all-cause mortality, lowest risk of type 2 diabetes, and lowest risk of cardiovascular disease compared to underweight, overweight, or obese individuals. There is no single "ideal" weight inside the range — anywhere from the lower bound to the upper bound is considered healthy.

We invert the BMI formula. BMI = weight (kg) ÷ height (m)². Rearranging: weight = BMI × height². We plug in BMI 18.5 and 24.9 to find the lower and upper edges of your healthy range, then convert back to your chosen units. So a 175 cm (1.75 m) person has a healthy range of 18.5 × 1.75² = 56.7 kg to 24.9 × 1.75² = 76.3 kg.

The "healthy" BMI band covers 6.4 BMI points, which translates to a 20–47 lb (9–21 kg) weight window depending on height. The width reflects natural variation in body composition — two healthy people of the same height can legitimately differ by that much because one carries more muscle, more bone, or a different fat distribution. Don't fixate on a single target inside the range.

Not always. Muscle is denser than fat, so trained athletes often weigh more than their "BMI-healthy" range without being unhealthy. A muscular 6' rugby player may legitimately weigh 210 lb (BMI 28.5, technically "overweight") with low body fat. For very muscular individuals, look at body fat percentage and waist circumference instead of relying on BMI alone.

Yes. The WHO standard cutoffs (18.5–24.9 healthy, 25+ overweight, 30+ obese) work well for European-descended populations. For people of South Asian, East Asian, and Polynesian heritage, metabolic risks rise at lower BMIs, so health authorities often use 23+ overweight and 27.5+ obese. If you're in one of these groups, mentally subtract about 2 BMI points from each threshold.

Anywhere inside the range is fine, but a sensible default target is the midpoint (around BMI 22). It gives you some buffer in both directions and corresponds to the BMI band where large epidemiological studies show the lowest mortality. If you're already comfortably inside the range and feeling well, maintaining is usually a better goal than chasing a specific number.

Generally no. The low end of the healthy range (BMI ~18.5) is just above underweight, and being persistently very lean is associated with hormone disruption (especially in women), lower bone density, and weaker immunity. Targeting the lower-middle of the band (BMI 20–22) usually gives the best balance of aesthetics, performance, and long-term health.

0.5–1 kg (1–2 lb) per week is the sustainable and evidence-backed rate for weight loss. Faster rates almost always cause excessive muscle loss, fatigue, and rebound regain. If you have a long way to go, plan in 3-month phases with diet breaks at maintenance every 8–12 weeks to protect metabolism. Even modest 5–10% weight loss already produces measurable improvements in blood pressure, lipids, and blood sugar.

No. Children and teens (ages 2–19) use BMI-for-age percentile charts from the CDC or WHO rather than fixed adult thresholds, because body composition changes throughout growth. The adult range shown here applies from age 20 onwards. For paediatric assessment use a dedicated children's BMI percentile tool or consult a paediatrician.

BMI-based healthy weight ranges do not apply during pregnancy. For weight gain targets in pregnancy, use the IOM 2009 ranges (which depend on your pre-pregnancy BMI) and consult our pregnancy weight gain calculator. While breastfeeding, modest, gradual weight loss back toward your pre-pregnancy weight (0.5 kg/week max) is safe — never aggressively diet during lactation.

Weight tells only part of the story. Pair it with: waist circumference (men > 40", women > 35" indicates higher cardiometabolic risk); body fat percentage via calipers, bioimpedance, or DEXA; resting blood pressure; and fasting blood glucose if you have access. Together these capture far more than weight alone.

No. This calculator is educational. If you have ongoing concerns about weight, body composition, or related health issues — especially eating disorder history, thyroid issues, chronic conditions, or anything else that complicates weight management — speak to a physician or registered dietitian. They can interpret weight in the context of your full clinical picture, which a generic calculator cannot do.