How healthy weight ranges are calculated
The standard healthy weight range for a given height is derived from the Body Mass Index (BMI) classification system. A BMI between 18.5 and 24.9 is classified as "healthy weight" by the World Health Organisation. Converting these BMI boundaries back to weight for any given height gives the healthy weight range.
The calculation is: Weight = BMI × (height in metres)²
So for a person who is 170 cm (1.70 m) tall:
Lower bound: 18.5 × (1.70)² = 18.5 × 2.89 = 53.5 kg
Upper bound: 24.9 × (1.70)² = 24.9 × 2.89 = 71.9 kg
Healthy weight range: 53.5 – 71.9 kg
The BMI-based ranges are the most widely used population-level benchmarks and form the basis of healthy weight charts used by healthcare systems worldwide. However, as you will see below, they come with important limitations — particularly for muscular individuals, older adults, and people of certain ethnicities.
Healthy weight chart by height (metric and imperial)
The following table shows the healthy weight range (BMI 18.5–24.9) for heights from 5'0" to 6'4":
| Height (ft/in) | Height (cm) | Min Weight (kg) | Max Weight (kg) | Min Weight (lbs) | Max Weight (lbs) |
|---|---|---|---|---|---|
| 5'0" | 152 cm | 42.8 kg | 57.6 kg | 94 lbs | 127 lbs |
| 5'2" | 157 cm | 45.6 kg | 61.4 kg | 100 lbs | 135 lbs |
| 5'4" | 163 cm | 49.1 kg | 66.2 kg | 108 lbs | 146 lbs |
| 5'6" | 168 cm | 52.2 kg | 70.3 kg | 115 lbs | 155 lbs |
| 5'8" | 173 cm | 55.4 kg | 74.6 kg | 122 lbs | 164 lbs |
| 5'10" | 178 cm | 58.7 kg | 79.0 kg | 129 lbs | 174 lbs |
| 6'0" | 183 cm | 62.0 kg | 83.4 kg | 137 lbs | 184 lbs |
| 6'2" | 188 cm | 65.3 kg | 88.0 kg | 144 lbs | 194 lbs |
| 6'4" | 193 cm | 68.8 kg | 92.7 kg | 152 lbs | 204 lbs |
Ranges based on BMI 18.5–24.9 using the standard WHO formula. These are population-level guidelines, not individual prescriptions.
Why healthy weight varies by frame size
The healthy weight range for any given height spans a considerable window — often 15–20 kg. This is intentional: bone structure varies significantly between people of the same height, and the "ideal" end of the healthy range differs accordingly.
Frame size is determined primarily by bone density and skeletal width, which can be approximated by wrist circumference. A simple assessment:
- Small frame: Women with wrist circumference below 14 cm; men below 16 cm. These individuals naturally carry less skeletal mass and tend toward the lower half of the healthy weight range.
- Medium frame: Women 14–14.9 cm; men 16–16.9 cm. The midpoint of the healthy range is appropriate.
- Large frame: Women 15 cm and above; men 17 cm and above. Large-framed individuals carry more bone mass and tend to be healthy toward the upper portion of the range.
A woman who is 5'6" (168 cm) with a small frame might be healthy at 52–58 kg, while a large-framed woman of the same height might be healthy at 63–70 kg — yet both fall within the BMI-defined "healthy" category. Neither is more or less healthy for their frame type; the ranges accommodate both.
How age affects healthy weight
BMI-based weight ranges do not change with age, but the body composition underlying any given weight shifts considerably across the lifespan. This creates some important nuances:
Young adults (20s–30s): Bone density is typically near its peak and muscle mass is relatively high. The full healthy weight range applies, and people in their 20s can generally sustain weights at the lower end of the range without health concerns.
Middle-aged adults (40s–50s): Muscle mass begins to decline and fat mass tends to increase even at the same body weight. A 50-year-old at the same weight as their 30-year-old self may actually have higher body fat despite identical BMI. The practical implication: resistance training to preserve muscle becomes increasingly important, and the lower half of the weight range may be harder to sustain healthily.
Older adults (60s+): Some research suggests that slightly higher weights (BMI 23–27) may be protective against frailty, hospitalisation, and recovery from illness in older adults. Being underweight becomes a meaningful clinical risk in this age group. Many geriatric health guidelines actually recommend against aggressive weight loss in people over 65 unless medically necessary.
Muscle mass and why it changes everything
Perhaps the most important limitation of weight charts is that they cannot distinguish between muscle and fat. Muscle tissue is approximately 20% denser than fat — meaning a kilogram of muscle occupies significantly less space. A person who regularly weight-trains will weigh more than a sedentary person of the same apparent size, even if their body fat percentage is substantially lower.
A 5'10" man who weight-trains consistently might weigh 84 kg with 15% body fat — technically near the top of the healthy range on the chart above, but with an excellent health profile. A sedentary man at the same height weighing 72 kg might have 27% body fat — comfortably within the "healthy" weight range but with considerably higher metabolic risk.
This is why weight alone — even in context of a chart — is an incomplete health metric for active individuals.
Better metrics to use alongside weight
Waist circumference
Abdominal fat — particularly the visceral fat surrounding the organs — is the type most strongly associated with cardiovascular disease, type 2 diabetes, and metabolic syndrome. Waist circumference captures this directly where a weight chart cannot.
Risk thresholds: for women, increased risk begins above 80 cm (31.5 inches) and high risk above 88 cm (34.6 inches). For men, increased risk begins above 94 cm (37 inches) and high risk above 102 cm (40 inches). These numbers apply regardless of weight or height.
Body fat percentage
Directly measuring the proportion of fat versus lean mass gives a far clearer health picture than weight alone. Healthy body fat ranges are roughly 18–28% for women and 10–20% for men, varying by age. You can estimate your body fat percentage using our Body Fat Calculator without any specialist equipment.
BMI as a cross-check
Despite its limitations, BMI calculated from our BMI Calculator remains a useful population-level screen. A BMI between 20 and 24 combined with a healthy waist circumference and body fat percentage is one of the strongest combinations of easily measurable indicators of metabolic health.
How to interpret where you sit in the healthy weight range
If your weight falls within the healthy range for your height — congratulations, but do not stop the analysis there. Consider:
- Are you closer to the lower or upper bound? For active, muscular individuals, being toward the upper bound of the range is often healthy and appropriate. For sedentary individuals, being at the upper bound with a high waist circumference suggests less favourable body composition.
- Has your weight changed significantly in the past year? Unintentional weight loss or gain of 5% or more warrants discussion with a healthcare provider regardless of where you sit within the range.
- What is your trajectory? Gradual weight increase over years — even staying within the "healthy" range — often reflects increasing fat mass and decreasing muscle. Addressing this through resistance training before crossing into "overweight" BMI is far easier than reversing it later.
The bottom line
The healthy weight charts in this article give you a practical, science-based starting point. They tell you the weight range associated with the lowest population-level health risk for your height. But no chart — and no single number — tells the complete story of your health.
Use weight and BMI as one tool in your health toolkit, alongside waist circumference, body fat percentage, blood pressure, blood sugar, and cholesterol. And remember: the goal is not to hit a specific number on the scale. The goal is to build a healthy, strong body that functions well and supports an active, fulfilling life.