Evidence-Based Fitness & Health Calculators for Singapore
Use these tools to understand key health and training metrics (e.g., BMI, TDEE, heart rate zones). They are designed for practical use, with senior-safety considerations and clear interpretation. These open-access calculators are widely referenced in exercise science and public health, and are intended as starting points for safe, evidence-based planning.
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These are open-access tools commonly used in health planning. UFitness uses them as starting points, then prioritises safe progression, functional independence, and sustainable habits.
1) BMI Calculator (Asian Cut-offs)
Body Mass Index (BMI) is a simple screening tool used to estimate body weight status based on height and weight. It provides a quick indication of whether an individual may be underweight, within a healthy range, overweight, or obese.
BMI does not measure body composition such as muscle mass, fat distribution, or bone density, and should be interpreted together with other indicators such as waist circumference, physical activity levels, and medical history. In older adults, BMI alone may not reflect risks related to sarcopenia or functional health.
Asian BMI classification commonly used in Singapore:
- Underweight: below 18.5
- Normal weight: 18.5 – 22.9
- Overweight: 23 – 27.4
- Obese: 27.5 and above
2) Waist-to-Height Ratio (WHtR)
WHtR is often more informative than BMI for central adiposity risk. A common public-health rule of thumb: keep waist less than half your height (general guidance).
3) BMR & TDEE Calculator (Mifflin-St Jeor)
BMR estimates baseline energy needs at rest. TDEE adjusts for activity level. For older adults, aggressive deficits can increase fatigue and contribute to muscle loss. Use this as a planning estimate, not a strict prescription.
Cardio & Training Safety
These tools support safe exercise intensity planning. If you are on heart or blood pressure medication (e.g., beta blockers), heart rate may not reflect effort reliably—use RPE (perceived exertion) and professional guidance.
4) Target Heart Rate Zones (Karvonen / HRR)
Uses: Target HR = ((HRmax − Resting HR) × intensity) + Resting HR. HRmax is estimated (220 − age). For many people, RPE + talk test is equally important.
Advanced Screens
These screenings are aligned to active ageing and functional outcomes. You can complete the questions first. To unlock the full interpretation and recommended next steps, enter your email so we can send your screening summary.
5) Fall Risk Self-Screen (Non-diagnostic)
This is a practical awareness screen (not a medical diagnosis). If you have recent falls, fainting, or severe dizziness, seek professional medical evaluation.
6) Sarcopenia Awareness Screen (Educational)
This checks common risk signals (age, low activity, weakness markers). It cannot diagnose sarcopenia. If you suspect significant weakness or unintentional weight loss, consult a clinician.