Ideal Weight Calculator
Health
Ideal weight calculator
Enter your height to see the weight range associated with a normal BMI (18.5–24.9) and understand what the number means.
Ideal Weight Calculator
Lower ideal weight
53 kg
Upper ideal weight
72 kg
Height
170 cm
How calculations work
This calculator derives an approximate healthy weight range from body mass index (BMI) thresholds commonly used in public health (BMI 18.5–24.9). Given height, it computes the weights that correspond to these BMI values. All math runs locally and is intended for informational use.
How to interpret results
The range provides a rough estimate of weights associated with BMI thresholds. BMI does not account for body composition, age-related factors, or medical conditions. Use this as one input among others when considering health goals.
Disclaimer
What this calculator does
This tool converts your height into an approximate healthy weight range by mapping it to BMI thresholds of 18.5 (lower bound of normal weight) and 24.9 (upper bound). The result is a kilogram or pound range that corresponds to what the World Health Organization considers a normal BMI for adults aged 20 and older.
Who should use this calculator
Anyone wanting a quick reference for BMI-based healthy weight ranges — people setting initial fitness goals, health educators creating materials, or anyone curious about how height translates to weight at standard BMI cutoffs. This is not a diagnostic tool and is not suitable as a sole health assessment.
How this calculator works
The calculator rearranges the BMI formula: Weight = BMI × Height². It computes two values — one at BMI 18.5 and one at BMI 24.9 — to produce a range. For example, at 1.70 m the lower bound is 18.5 × 1.70² ≈ 53.5 kg and the upper bound is 24.9 × 1.70² ≈ 71.9 kg. All calculations run locally in your browser with no data sent to any server.
How to interpret your result
The output is an approximate range, not a precise target. If your current weight falls within the range, it aligns with the normal BMI band for your height. Being outside the range does not automatically indicate a health problem — BMI does not account for body composition, age, sex, ethnic background, or fitness level. Use the result as a conversation starter with a healthcare professional, not as a verdict.
Example
For a person 1.75 m (5 ft 9 in) tall, the BMI 18.5–24.9 range maps to roughly 56.6–76.2 kg (125–168 lb). A person 1.60 m (5 ft 3 in) tall sees a range of about 47.4–63.7 kg (104–140 lb). Enter your own height above to calculate your personalised range.
Limitations & disclaimer
This tool uses BMI thresholds only and does not measure body composition, fat distribution, muscle mass, or overall fitness. Pregnant women, children, elderly adults, and highly muscular individuals may receive misleading results. For personalised health guidance consult a healthcare professional. This calculator is for informational purposes only.
Frequently asked questions
Is there one true "ideal weight"?
No. Ideal weight depends on many factors including muscle mass, bone density, age, sex, and overall health. The range shown here is based on population-level BMI thresholds and should be treated as a general guideline, not a personal target.
Why does this calculator use BMI thresholds?
BMI is the most widely recognised screening metric used by the World Health Organization and national health services. While imperfect, it provides a quick reference point that most people and healthcare providers understand.
Can athletes use this calculator?
Athletes with high muscle mass may find the range too narrow because BMI does not distinguish between muscle and fat. Athletes should supplement this with body-fat percentage, waist-to-hip ratio, or advice from a sports nutritionist.
Does this work for children and teenagers?
No. Children and teenagers require age- and sex-specific growth charts rather than fixed BMI cutoffs. Consult a paediatrician for child-specific ideal weight guidance.
How accurate is the result?
The result is mathematically accurate for the BMI formula used. However, the concept of "ideal weight" is more nuanced than a single formula. Use the output as a starting point for a conversation with your doctor, not as a definitive answer.