All calculators
Ten free tools for pregnancy dating, cycle tracking and fertility estimates. Each one runs entirely in your browser and needs no account.
Pregnancy calculators
Estimate a due date, work out how many weeks along you are, and see how the pregnancy timeline is dated.
Pregnancy Due Date Calculator
Estimate your due date from your last period, conception, or an IVF transfer.
OpenPregnancy Calculator
The whole picture: due date, current week, trimester and key dates.
OpenPregnancy Week Calculator
See how many weeks and days along you are today, to the day.
OpenConception Date Calculator
Work backwards from your due date to estimate when you conceived.
OpenIVF Due Date Calculator
Precise dating from your transfer date and embryo age.
Open
Fertility calculators
Estimate ovulation, your fertile window, implantation timing and when a pregnancy test could be meaningful.
Ovulation Calculator
Estimate when you ovulate and which days are most fertile.
OpenFertile Window Calculator
A day-by-day cycle calendar showing your most fertile days.
OpenPregnancy Test Calculator
Estimate the dates when a home test could give a meaningful result.
OpenImplantation Calculator
See the days after ovulation when implantation typically happens.
Open
Period calculators
Project future period dates and see how your cycle length shapes every other estimate on this site.