Family size probability calculator A statistics tool for a fun family-planning question: if you have a certain number of children, what are the odds of a particular mix of boys and girls? This uses basic probability, not biology — real pregnancies aren’t perfectly independent coin flips, but the math gives a reasonable, widely used approximation. … Read more
Irregular period pregnancy chance calculator A pregnancy chance calculator built specifically for irregular cycles. Instead of assuming a fixed 28-day cycle, it uses the range across your recent cycle lengths to estimate a fertile window, and shows how the timing of intercourse relative to that window affects your odds this cycle. Your recent cycles Last … Read more
Educational screening tool only. This calculator cannot diagnose ectopic pregnancy and does not replace an hCG blood test or ultrasound. Ectopic pregnancy can occur even with no risk factors at all — use this to organize your history for a conversation with a clinician, not to rule anything in or out on your own. Ectopic … Read more
Recurrent miscarriage risk calculator A worksheet to help you understand where you sit relative to common thresholds for recurrent pregnancy loss evaluation, and to prepare questions for your clinician — including what the evidence suggests about miscarriage risk after 2 miscarriages or more. Your history Current age Number of previous miscarriages 01234 or more Most … Read more
CRL calculator Estimate gestational age and due date from a first-trimester crown-rump length measurement, using the Robinson & Fleming formula. Crown-rump length (mm) Most reliable between 10 mm and 84 mm (roughly 6+0 to 13+6 weeks). Scan date Date the ultrasound measurement was taken. This measurement is outside the range where the Robinson & Fleming … Read more
Placenta Accreta Spectrum risk estimator A history- and imaging-based worksheet to help stratify PAS risk. Built from published associations between placenta previa, prior cesarean count, and adjunct risk factors. Intended to support, not replace, clinical and radiologic judgment. Obstetric history Number of prior cesarean deliveries 012345 or more History of placenta accreta spectrum in a … Read more
How effective is your method? Select one or more contraceptive methods to compare how many pregnancies typically occur per 100 users in a year, with typical use versus perfect use. Your comparison Numbers show pregnancies per 100 people using the method for one year. About these numbers. Rates reflect commonly cited U.S. clinical research on … Read more
Baby Head Percentile Calculator Baby Head Percentile Calculator Estimate where your baby’s head circumference falls on a standard growth curve, based on their age and sex — a general reference, not a clinical measurement. Sex Boy Girl Date of birth Date of measurement Defaults to today — change it if the measurement was taken on … Read more
Educational estimate, not a diagnosis Get Pregnant After the Birth Control Shot: Timeline Calculator The birth control shot (Depo-Provera) delays the return of fertility longer than most other methods, and the delay isn’t related to how long you were using it. Enter the date of your last injection to see where you sit on the … Read more
Works backward from a due date or scan Reverse Due Date Calculator Enter your due date, or an early ultrasound date and gestational age, to estimate your conception date, the likely conception window, and your last menstrual period (LMP). What do you know? My estimated due date (EDD)An ultrasound date and gestational age Estimated due … Read more