Calculators
30 date tools, one quiet desk
IVF dating, reverse conception, implantation, pregnancy weeks, and light cycle support. Pick the question you actually have — estimate only, not medical advice.
Last updated: July 17, 2026
IVF & transfer
Day 3 / 5 / 6 and FET due dates, plus LMP-equivalent for stubborn hospital forms.
8 tools
- IVF due date calculatorEstimate due date from IVF or FET transfer — Day 3, Day 5, Day 6.Open
- Calculate due date from IVFWork out EDD from your embryo transfer date and day age.Open
- FET due date calculatorFrozen embryo transfer due date from FET date and day age.Open
- Day 3 embryo transfer due dateEDD after Day 3 transfer: transfer + 263 days.Open
- Day 5 blastocyst transfer due dateEDD after Day 5 blastocyst transfer: +261 days.Open
- IVF LMP equivalent calculatorConvert IVF EDD or transfer into an LMP-equivalent for apps and forms.Open
- Due date by IVF transferEDD from IVF transfer and embryo day age.Open
- IVF gestational age calculatorWeeks + days after IVF from transfer or EDD.Open
Reverse & conception
Work backward from an EDD — conception window, not a fake exact hour.
3 tools
Implantation & testing
Rough implantation window and when a home test is less of a coin flip.
3 tools
Weeks & gestational age
How many weeks today, trimester buckets, and multi-mode EDD.
9 tools
- Gestational age calculatorWeeks + days today from LMP, due date, or IVF transfer.Open
- Pregnancy week calculatorWhat week am I? Weeks + days and trimester hint.Open
- How many weeks pregnant calculatorFull-sentence weeks pregnant estimate from LMP or EDD.Open
- Pregnancy week by LMPPregnancy week from last menstrual period.Open
- Pregnancy calculator by weeksStart from a week number — rough EDD and trimester.Open
- Pregnancy trimester calculatorFirst, second, or third trimester from LMP or EDD.Open
- EDD calculator (multi-mode)Estimated due date from LMP, ovulation, conception, or IVF.Open
- LMP due date calculatorDue date from last period with optional cycle adjustment.Open
- Due date from ovulationEDD from ovulation day using +266 math.Open
Cycle support
Period / luteal rough cuts — not a wearable tracker.
5 tools
- Luteal phase calculatorLuteal length from ovulation to period start.Open
- Next period calculatorPredict next period from last start and cycle length.Open
- Menstrual cycle calculatorCycle length context and rough ovulation estimate.Open
- Period calculatorNext period dates from last period and cycle length.Open
- Ovulation estimate from cycleRough ovulation from period start and cycle length.Open
Fun (entertainment)
Folk gender calendar — entertainment only, not ultrasound.
2 tools
Estimate only — not medical advice. Ultrasound and clinic dating policy override any browser estimate. Confirm medical decisions with your clinician.