Ideal Weight Calculator
Find your ideal weight range using four established formulas and Singapore's BMI thresholds.
What is an Ideal Weight Calculator?
An ideal weight calculator estimates the healthiest weight for your height and gender using established medical formulas. This calculator compares four formulas (Devine, Robinson, Miller, Hamwi) and also shows the healthy weight range based on Singapore's Asia-Pacific BMI thresholds of 18.5 to 23.0, which are stricter than the WHO standard.
Enter your height and gender to calculate ideal weight ranges
Ideal Weight
—
BMI Range
—
Quick Reference
- • Singapore healthy BMI range: 18.5 – 22.9 (lower than WHO's 18.5 – 24.9)
- • Devine formula is the most widely used in clinical settings
- • Ideal weight varies based on body composition, muscle mass, and age
- • HPB recommends using BMI alongside waist circumference for a complete picture
How Ideal Weight Is Calculated
There is no single "correct" ideal weight. This calculator compares four established medical formulas to give you a range. Each was developed from clinical studies on healthy body weight.
For Singapore residents, we also show the healthy weight range based on Asia-Pacific BMI thresholds (18.5 – 23.0), which provide the most relevant reference for local health assessment.
Devine Formula (1974)
Most widely used in clinical settings. Men: 50 + 2.3 kg per inch over 5 ft. Women: 45.5 + 2.3 kg per inch over 5 ft.
Robinson Formula (1983)
Modified Devine formula with updated coefficients based on larger population study.
Miller Formula (1983)
Tends to give higher ideal weight estimates, particularly for shorter individuals.
Hamwi Formula (1964)
One of the earliest ideal weight formulas, still used as a quick clinical reference.
Frequently Asked Questions
What formulas does this ideal weight calculator use?expand_more
This calculator uses four widely-recognised formulas: Devine (1974), Robinson (1983), Miller (1983), and Hamwi (1964). Each formula estimates ideal body weight based on height and gender. We also show the healthy weight range based on Singapore's BMI thresholds of 18.5 to 23.0.
Why does Singapore use a BMI range of 18.5 to 23.0?expand_more
Singapore and the Asia-Pacific region use a lower upper threshold of 23.0 (versus the WHO standard of 25.0) because research shows Asians face higher health risks at lower BMI levels. The Health Promotion Board (HPB) recommends maintaining a BMI between 18.5 and 22.9 for optimal health.
Why do the four formulas give different results?expand_more
Each formula was developed from different population studies and uses different mathematical approaches. Devine's formula is the most commonly used in clinical settings, while Robinson and Miller tend to give slightly higher estimates for shorter individuals. It is best to view the range across all four formulas rather than relying on a single number.
Is ideal weight the same for everyone of the same height?expand_more
No. Ideal weight varies based on body composition, muscle mass, bone density, age, and overall health. These formulas provide useful reference ranges but should be considered alongside other metrics like body fat percentage, waist circumference, and overall fitness level.
Sources
- • Health Promotion Board (hpb.gov.sg) — Asia-Pacific BMI thresholds and healthy weight guidelines
- • Devine BJ (1974) — Gentamicin therapy, ideal body weight formula
- • Robinson JD et al. (1983) — Determination of ideal body weight for drug dosage calculations