Tools

Calculators

Personalized tools that turn your numbers into clear targets. No guesswork, no generic advice.

Sleep Cycle Calculator

Find the best bedtime or wake time based on 90-minute sleep cycles. Wake at the end of a cycle, not the middle.

Find your optimal first coffee time and last-coffee cutoff. Based on the 90-min cortisol awakening response and caffeine half-life science.

More calculators coming soon: sleep debt, HRV zone targets, and training load.