Health & timing calculators
10 free calculators · instant · nothing you enter is uploaded
Some health questions are really scheduling questions: when to sleep so you wake between cycles, how much sleep debt has built up, how a blood-pressure reading compares with the usual range, how old you are in days and weeks. These calculators put a clear number on those everyday measurements and show the reference ranges they sit against. A reading outside a range is a reason to talk to a clinician, never a diagnosis in itself.
Sleep Cycle Calculator
Best bedtimes and wake times.
Pregnancy Due Date Calculator
Estimated due date and milestones.
Pregnancy Weight Gain Calculator
Recommended gain by week and BMI.
Ovulation Calculator
Fertile window and ovulation date.
Period Calculator
Predict your next six periods.
Age Calculator
Exact age in years, months and days.
Intermittent Fasting Calculator
Plan your eating and fasting window.
Sleep Debt Calculator
How much sleep you owe yourself.
Caffeine Half-Life Calculator
How much caffeine is left at bedtime.
A1C to eAG Calculator
Convert HbA1c to average glucose.