Longevity tools, built from evidence
Simple calculators and planners for common questions. Each page shows the assumptions and sources, so you can see what the output does—and does not—mean.
Free tools
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Creatine dose calculator
Estimate a daily creatine maintenance amount from body weight.
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Caffeine cutoff calculator
Find a practical caffeine cutoff time for your bedtime.
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Supplement timing planner
Choose a daily timing option for selected supplements.
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Longevity calculator
Explore an editorial estimate based on selected interventions.
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Longevity supplement & intervention evidence grades 2026
Filter, sort and download grades for published interventions.
Browse the evidence-grade data