Calculators, timers and quizzes you can use in a minute. Each one sits on a page that explains how it works, where its numbers come from, and what it cannot tell you.
A personalized meal plan starts with how much energy and protein your body needs each day, then fills the week with meals that fit how you eat. Use the free builder to get your daily targets, a 7-day plan and a shopping list in about two minutes.
The most reliable way to start a new habit is an if-then plan: tie a small action to something you already do every day, and decide in advance what you will do if something gets in the way. Fill in the planner to write yours.
For everyday flexibility, stretch each major muscle group for about 60 seconds in total, at least two or three days a week, holding each stretch to a gentle pull rather than pain. Pick the areas that feel tight and the time you have to get a routine with a follow-along timer.
Most healthy adults need about 2.0 to 2.7 liters of water a day for women and 2.5 to 3.7 liters for men, counting water from food as well as drinks. Use the calculator to see your range and check how much you sweat when you exercise.
The easiest way through a clock change is to move your bedtime 15 to 20 minutes a night for a few nights beforehand: earlier before clocks spring forward, later before they fall back. Enter your usual times for a night-by-night plan.
Jet lag eases as your body clock catches up with local time, on average about 1.5 hours a day after flying west and 1 hour a day after flying east. Enter your trip to get a day-by-day plan for sleep, light and caffeine.
Answer 3 short steps and get a free 4-week workout plan built from WHO and ACSM guidelines, matched to your experience, time, equipment and goal.
Pick a length and a focus, press start and close your eyes: a bell marks the start and end. One study saw benefits from 13 minutes a day over 8 weeks.
Social jetlag is the gap between the middle of your sleep on workdays and free days. Enter both schedules to see how far your body clock shifts each week.
Your real working week includes extra hours, the commute and after-hours messages. Add them up to see the time work takes and how much of each day is left.
Moderate exercise is 64 to 76% of your maximum heart rate. Enter your age to see your light, moderate and vigorous zones, plus a 10-second pulse count.
Caffeine roughly halves every 3 to 5 hours in adults. Add your drinks and bedtime to see what is left when you sleep, and when your last cup should be.
Rest comes in four kinds: detachment, relaxation, mastery and control. Answer eight quick statements to find the one your evenings have been missing most.
Pick a pattern, press start and breathe with the circle: in as it grows, out as it shrinks. Breathing research points to five minutes or more a session.
To find your bedtime, count backward from your alarm in roughly 90 minute sleep cycles and add time for falling asleep. Waking at 7:00am with a 15 minute allowance points to 9:45pm for 9 hours of sleep, 11:15pm for 7 hours 30, or 12:45am for 6 hours.
These tools are for general education and planning. They give estimates, not a diagnosis, and they are not a substitute for advice from a professional who knows your situation.
