All calculators
Six focused tools for the questions people ask most often about periods, fertility, pregnancy, and contractions. No account, no upload, no guesswork about the method.
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Period Calculator
Next period, current cycle day, ovulation, and fertile window.
Open calculatorOvulation Calculator
Likely ovulation date and the days around it.
Open calculatorFertile Window Calculator
The estimated range of days when conception is most likely.
Open calculatorDue Date Calculator
Estimated due date, conception date, and gestational age.
Open calculatorPregnancy Week Calculator
Current gestational age from a due date or last period.
Open calculatorContraction Timer
Duration and spacing records you can print for your care team.
Open timerGeneral references
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