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Evidence-Based Fitness & Health Calculators for Singapore

Use these practical calculators to understand BMI, waist-to-height ratio, estimated energy needs, heart-rate zones, weekly activity level, senior exercise readiness, fall-risk signals, and sarcopenia risk signals. They are designed as education-first tools for safer planning, not as medical diagnosis.

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Stop and seek urgent medical help if you have chest pain, fainting, severe breathlessness at rest, sudden weakness, sudden speech/vision difficulty, or symptoms that feel unusual or severe. This page cannot diagnose, clear, or treat medical conditions.

Core Calculators

These tools are useful starting points. For older adults, the result should be interpreted together with strength, balance, medical history, medication use, function, nutrition, and recent changes in health.

1) BMI Calculator — Asian Adult Cut-offs

BMI is a screening tool, not a body-composition test. In Singapore, adult Asian BMI ranges commonly classify 18.5–22.9 as healthier range, 23.0–27.4 as moderate risk, and 27.5+ as high risk.

2) Waist-to-Height Ratio

Waist-to-height ratio helps flag central adiposity. A common public-health guide is to keep waist measurement below half of height.

3) BMR & TDEE Calculator — Mifflin-St Jeor Estimate

BMR estimates resting energy needs. TDEE adjusts for activity level. For seniors, frail adults, and anyone losing weight unintentionally, avoid aggressive dieting and seek qualified guidance.

Senior safety note: preserving muscle, strength, appetite, hydration, and daily function is usually more important than chasing a large calorie deficit.

Cardio & Activity Planning

These tools support intensity and weekly activity planning. If you take beta blockers or other rate-limiting medication, heart rate may not reflect effort accurately. Use RPE, talk test, and professional guidance.

4) Target Heart Rate Zones — HRR / Karvonen Method

This estimates training zones using heart-rate reserve. Estimated HRmax is only an estimate; RPE and talk test remain important.

5) Weekly Activity Estimate

Estimate whether your current week meets general adult activity guidance. Vigorous minutes are counted as roughly double moderate minutes.

Senior Screening & Exercise Readiness

These non-diagnostic tools help guide safer next steps. For seniors, people with chronic conditions, or anyone recently unwell, the pathway should be conservative and safety-first.

6) Senior Fitness Readiness Pathway

A PAR-Q-style pathway for deciding whether to start gently, book a supervised functional assessment, or seek medical clearance first.

7) Fall Risk Self-Screen — Quick STEADI Style

This uses simple fall-risk signals: past falls, feeling unsteady, and worry about falling. It does not replace medical assessment.

8) SARC-F Sarcopenia Risk Screen

SARC-F is a simple screening questionnaire for sarcopenia risk signals. A higher score suggests the person should consider proper strength, nutrition, function, and clinical review where appropriate.

Professional scope note: UFitness can provide fitness education, functional assessment, supervised exercise planning, and safe progression. Medical diagnosis, treatment decisions, medication changes, and medical clearance must come from qualified healthcare professionals.

References & Basis

This page is built from widely used public-health and exercise-science screening concepts. Reference links are included for transparency.

Need a safer starting plan?

If your result shows red flags, moderate/high fall-risk signals, low activity, or sarcopenia risk signals, the safest next step is a guided functional assessment and progressive plan.

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