Calculators and timers to help you build daily habits — water intake, breathing, sleep cycles, exercise pacing, and more. All free, no signup.
Box, 4-7-8, equal, coherent, Wim Hof — guided breathing in one timer.
How much water you need per day — based on body weight, activity, and climate.
Find your ideal bedtime based on 90-min sleep cycles.
Classic 25/5 focus cycles with daily-count tracking.
Convert steps to miles, kilometres, and calories burned.
30-day progressive challenge + free hold timer.
GTD + Atomic Habits 2-minute countdown.
Karvonen + simple HRmax — find your 5 training zones.
Turn vague intentions into specific, measurable, dated goals + a supporting habit.
Interval timer for the 8-stretch beginner routine.
10 widely-believed productivity and habit claims — each with the research that disproves it.
Estimate your 1RM (Epley + Brzycki) with a full %-of-1RM training chart.
Your daily calorie needs (BMR + TDEE) via Mifflin–St Jeor.
Daily protein, carb & fat targets from your TDEE, goal & diet split.
Body fat % via the US Navy tape method, plus fat & lean mass.
Calories burned walking from weight, time & pace (MET formula).
Count sober days plus money & calories saved since you quit.
Add up 7 nights of sleep debt and get a simple payback plan.
Caffeine left at bedtime and your sleep-safe cutoff (5.7h decay).
Estimate the days to break a habit, with a week-by-week plan.
Chain new habits onto existing ones with the After-I-X-I-will-Y formula.
Cut high-stimulation inputs and get a time-blocked detox plan.
How much to save per day, week & month to hit a goal by your date.
Distraction-free timer with warm-up, interval bells & soft chime.
8-question quiz: lark, owl, or in between — plus your deep-work window.
Read a passage, get your words-per-minute and books-per-year payoff.
The tools above help you measure or pace a behavior. To actually build a daily habit around it, the missing piece is consistency — and consistency comes from a visible streak. HabitBox gives you that streak in one tap, no account, free on iOS and Android.