Catalyst Healthspan Tools

Catalyst Healthspan Tools is a set of ten free, evidence-based calculators that measure how well your body is ageing. Not how it looks.

Each calculator maps to one of the four pillars used in a real assessment protocol at Catalyst Performance, a longevity training studio in Singapore's CBD: body composition, cardiorespiratory fitness, stability, and strength. Enter a few numbers, get an instant result, and see your percentile by age and sex alongside what that number actually predicts.

No sign-up. No email wall. No app. Every threshold is drawn from published reference standards and cited on the page.

The ten tools: Fitness Age, VO2 Max, Grip Strength, Waist-to-Height Ratio, Sitting-Rising Test, Body Fat (Navy tape method), Protein Intake, Heart Rate Zones, Running Pace, and a GLP-1 Muscle-Loss estimator.

Percentile scoring by age and sex means a result is a position against your peer group rather than a bare number. Each calculator shows the research its thresholds come from, including the mortality and healthspan literature behind grip strength, VO2 max, and the sitting-rising test.

Results compute in the browser. Nothing is stored, and no account is ever required.

Every calculator is free to embed on any site: one line of code, no API key, no usage limit. The only condition is keeping the small attribution link. Copy the snippet from catalystperformance.sg/tools/embed.

For a composite picture there is the Healthspan Audit, a 12-question, two-minute assessment that returns a Healthspan Score on a 0 to 10 scale, benchmarked against over 900 completed audits.

Built with Next.js, React, TypeScript and Tailwind on Vercel, and mobile-first, because most people check these standing in a gym.