Science-based calculators that turn the research into a number you can act on. Free, instant, no sign-up — each one comes with a fully referenced explainer.
Your birthday tells your chronological age. Your habits tell a different story. Estimate your biological age in 60 seconds.
Open calculator → NutritionMost people guess their protein needs — and guess low. Get your daily target in grams from your weight, age and goal.
Open calculator → SleepFind out how many hours of sleep you actually owe each week — and whether weekend lie-ins can really pay it back.
Open calculator → FitnessEstimate your VO₂max without a treadmill test and see your "fitness age" — the number that out-predicts your cholesterol.
Open calculator → LongevityRate your daily habits out of 100, get a letter grade, and see the three changes with the biggest payoff for a longer life.
Take the quiz →Every tool is an educational estimate, not a medical test or diagnosis. ← Back to Anti-Aging Daily
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