All Calculators
Pregnancy Due Date Calculator
Estimate your baby’s arrival from LMP or ultrasound.
Ovulation Calculator
Find your most fertile days and ovulation date.
Implantation Calculator
Estimate your implantation window and best day to test.
Twin & Triplet Due Date
EDD plus typical delivery windows for multiples.
IVF/FET Due Date
EDD from transfer date (Day 3/5/6) + GA today.
Ultrasound Due Date
EDD from scan date and gestational age at ultrasound.
Pregnancy Chance Calendar
See your daily conception odds across the cycle.
Advanced Pregnancy Chance
Refine your estimate with age, BMI, and factors.
One-Time Pregnancy Chance
Estimate odds from a single encounter.
Fertility by Age
How age affects natural fertility rates.
Miscarriage Risk
Data-driven estimate of miscarriage risk.
Pregnancy Test Accuracy
Estimate accuracy by DPO and brand.
hCG Levels & Doubling Time
Compute doubling time, trend, and 48-hour projection.
Conception Date
Find conception from LMP, EDD, or ultrasound.
Reverse Due Date
Work backward from EDD to estimate conception.
Due Date by Intercourse Date
Timeline from a specific intercourse/conception date.
Missed Pill Risk
Estimate pregnancy risk after a late or missed pill.
Contraceptive Risk
Understand pregnancy risk by contraceptive method.
Combine Methods
Calculate effectiveness when using two methods.
Morning-After Pill Effectiveness
Model effectiveness by hours since sex and BMI.