Healthy Weight Range
Find your healthy body weight range based on height using BMI 18.5–24.9. See your BMI, weight status, and how much to adjust to reach a healthy weight.
What Is a Healthy Weight Range?
A healthy weight range is the span of body weights associated with good health outcomes for a given height. It is defined by the standard healthy BMI range of 18.5 to 24.9. Staying within this range is associated with lower risk of cardiovascular disease, type 2 diabetes, hypertension, sleep apnoea, and joint problems.
Unlike a single target weight, a healthy range acknowledges natural variation in body composition between people of the same height. Muscle density, bone structure, and age all affect body composition, so a range is more useful than a single number.
< 18.5
Underweight
18.5–24.9
Healthy
25–29.9
Overweight
≥ 30
Obese
How BMI Determines Healthy Weight
Body Mass Index (BMI) is a ratio of weight to height squared. It is the globally accepted standard for defining healthy weight ranges at a population level:
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Calculate BMI from weight and height
BMI uses weight in kilograms divided by height in metres squared.
BMI = weight (kg) ÷ height (m)² Example: 70 kg ÷ (1.75)² = 70 ÷ 3.0625 = 22.9 - 2
Apply healthy BMI limits to find weight range
Rearrange the BMI formula to solve for the minimum and maximum healthy weight.
Min = 18.5 × height² (m²) Max = 24.9 × height² (m²) For 1.75 m: Min = 18.5 × 3.0625 = 56.7 kg Max = 24.9 × 3.0625 = 76.3 kg - 3
Compare current weight to healthy range
If the current weight is outside the range, calculate the difference to the nearest edge.
Current: 82 kg | Max healthy: 76.3 kg Excess: 82 − 76.3 = 5.7 kg to lose
Healthy Weight Examples by Height
| Height | Height (ft) | Min Weight | Max Weight | BMI Range |
|---|---|---|---|---|
| 155 cm | 5'1" | 44.4 kg (98 lbs) | 59.8 kg (132 lbs) | 18.5 – 24.9 |
| 160 cm | 5'3" | 47.4 kg (104 lbs) | 63.7 kg (140 lbs) | 18.5 – 24.9 |
| 165 cm | 5'5" | 50.3 kg (111 lbs) | 67.7 kg (149 lbs) | 18.5 – 24.9 |
| 170 cm | 5'7" | 53.5 kg (118 lbs) | 71.9 kg (159 lbs) | 18.5 – 24.9 |
| 175 cm | 5'9" | 56.7 kg (125 lbs) | 76.3 kg (168 lbs) | 18.5 – 24.9 |
| 180 cm | 5'11" | 59.9 kg (132 lbs) | 80.6 kg (178 lbs) | 18.5 – 24.9 |
| 185 cm | 6'1" | 63.3 kg (140 lbs) | 85.2 kg (188 lbs) | 18.5 – 24.9 |
| 190 cm | 6'3" | 66.8 kg (147 lbs) | 89.8 kg (198 lbs) | 18.5 – 24.9 |
Limitations of BMI-Based Weight Ranges
BMI is a population-level screening tool, not a diagnostic test. It has well-known limitations that a healthy weight range calculator should acknowledge:
🏋️Athletes and high muscle mass
Muscular individuals may have a BMI in the 'overweight' range while having very low body fat. BMI does not distinguish between fat mass and muscle mass.
👴Age-related body composition changes
Older adults often have lower muscle mass and higher body fat at the same BMI compared to younger adults. Some evidence suggests a slightly higher BMI (23–27) may be protective in adults over 65.
🌍Ethnic variation
Asian populations show higher cardiometabolic risk at lower BMI thresholds. Some health organisations use lower cutoffs (e.g., BMI 23 as 'overweight') for East and South Asian individuals.
👶Children and adolescents
Standard BMI healthy weight ranges apply to adults only. Children use age- and sex-specific BMI percentile charts rather than fixed cutoff values.
How to Maintain a Healthy Weight
Knowing your healthy weight range is the first step. Here are evidence-based strategies:
🥗 Balanced nutrition
Prioritise whole foods, adequate protein (1.6–2.2 g/kg body weight), vegetables, and fibre. Reduce ultra-processed foods and added sugars.
🏃 Regular physical activity
150–300 minutes of moderate aerobic activity per week. Add resistance training 2+ days/week to preserve or build muscle mass.
💤 Quality sleep
7–9 hours per night. Chronic sleep deprivation increases hunger hormones (ghrelin) and reduces satiety hormones (leptin).
📊 Track progress wisely
Weigh yourself regularly (same time, same conditions). Focus on trends over weeks, not daily fluctuations. Body weight can vary ±2 kg day to day.
Frequently Asked Questions
What is the healthy BMI range?
The standard healthy BMI range is 18.5 to 24.9 for adults, as defined by the World Health Organisation (WHO). A BMI below 18.5 is considered underweight, 25–29.9 overweight, and 30 or above obese. This calculator uses these thresholds to derive the corresponding healthy weight range for your specific height.
How accurate is the BMI healthy weight range?
BMI is a reasonable population-level indicator of weight-related health risk. However, it does not account for fat distribution (waist circumference is also important), muscle versus fat mass, age, or ethnicity. Use it as a general guide, not a clinical diagnosis. A healthcare professional can provide a more comprehensive assessment.
Is my healthy weight the same regardless of age?
The BMI-based healthy range is the same for all adults over 18. However, older adults (65+) may benefit from maintaining a slightly higher weight within the range to have reserves during illness and to protect against muscle and bone loss. For children and teenagers, age- and sex-specific BMI percentile charts are used instead.
What if I am muscular — does the healthy weight range still apply?
If you have significantly above-average muscle mass (as in bodybuilders or strength athletes), your BMI may fall in the 'overweight' range even though you have low body fat. In this case, body fat percentage (using skinfold calipers, DEXA scan, or bioelectrical impedance) is a more meaningful measure than BMI-based weight ranges.
How much should I lose or gain to reach a healthy weight?
This calculator shows the exact difference between your current weight and the nearest edge of the healthy range. For weight loss, a deficit of 500 kcal/day produces approximately 0.5 kg/week. For weight gain to treat underweight, a surplus of 300–500 kcal/day with adequate protein and resistance training is recommended. Always consult a doctor or dietitian for personalised advice.
My weight is outside the range — should I be concerned?
Being outside the healthy BMI weight range is associated with increased health risk over time, but it is not an emergency. Even modest changes — losing or gaining 5–10% of body weight — can meaningfully improve metabolic health markers. Focus on sustainable lifestyle changes rather than rapid or extreme weight changes.