Health Tools & Calculators
Free, evidence-based calculators built by our editorial team. No signup, no data stored, everything runs in your browser.
Protein Calculator
How many grams of protein you need per day, based on your weight, activity, and goal.
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Sleep Cycle Calculator
The best times to go to bed or wake up so you finish a full 90-minute sleep cycle.
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Caffeine Calculator
How much caffeine will still be in your system at bedtime, and whether it will affect your sleep.
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These tools provide general estimates for healthy adults and are not medical advice. For personal guidance, talk to a healthcare professional.