Time your day to your body clock
A small set of free, science-backed tools to put the right thing at the right time — no signup, no catch. Each one is anchored to your own rhythm.
Best-Time Planner
Your whole day, perfectly timed
Enter your wake time and see the ideal window for coffee, deep focus, workouts, your biggest meal, and sleep — anchored to your rhythm.
Open tool →Caffeine Calculator
When to stop drinking coffee
Enter your bedtime to get your caffeine cutoff — plus how much caffeine is still in your system when you turn out the light.
Open tool →Jet Lag Planner
Beat jet lag in days, not your whole trip
A day-by-day light and sleep schedule — exactly when to seek light, when to avoid it, and your target bed and wake times for a new time zone.
Open tool →Shift Work Planner
Survive nights, earlies & swings
Enter your shift to get your ideal sleep window, light strategy, and caffeine timing — built to protect your sleep when you work against the clock.
Open tool →Body Clock Widget
Add a live body clock to your site
A free, embeddable widget that shows which organ is most active right now and updates through the day. Pick a theme, copy, paste.
Open tool →The best time to…
Quick single-answer guides — each pins your exact time from your wake time.
Want all of it, tailored to you?
These tools use general rules of thumb. Your chronotype shifts every window — take the free 2-minute quiz from The Body Clock for a complete schedule built around your body.
Take the free 2-minute quiz →