Use this calculator to estimate when you’re most likely to ovulate after a cycle of clomiphene (e.g. Clomid) or Letrozole (e.g. Femara). Enter your regimen and last pill date to get a likely ovulation window, the earliest reliable test day, and an estimated due date if you conceive. Educational only—timing varies and clinical monitoring is … Read more
Got a positive LH test and wondering when you’ll ovulate? Enter the time of your first positive OPK and your typical surge length. This tool estimates your ovulation window, highlights the best days to try, and suggests the first reliable pregnancy test day—plus your estimated due date if you conceive. Date of first positive OPK … Read more
A missed or late period can be stressful. This calculator weighs your cycle history, how many days late you are, recent protected or unprotected intercourse, and any test dates to estimate whether pregnancy or a delayed cycle is more likely-plus when to test or retest for the most reliable result. Not sure when your period … Read more
Check if you meet LAM (Lactational Amenorrhea Method) criteria while breastfeeding. Enter baby’s age, feeding pattern, night feeds, and period status to see if LAM applies, how effective it is, and when to switch methods. Baby’s age (months) Exclusive breastfeeding (%) 100% Approximate how much of baby’s intake is breast milk (no regular formula/solids = … Read more
Estimate your IUI pregnancy chance using age, trigger use, semen quality (normal or low), and which attempt you’re on. See per-cycle probability and cumulative odds estimates across the first three IUIs. Female Age IUIs this cycle Single IUIDouble IUI (two inseminations this cycle) Semen Quality (quick) Auto — use detailed values if enteredNormal parametersLow count/motility … Read more
Reviewed by Dr. Sony Sherpa, MBBS, MD on Dec 22, 2025 Estimate your likelihood of twins based on age, family history (maternal side), height/BMI, ethnicity, prior pregnancies, fertility treatment, and past twins. Results show a baseline risk with a fraternal (dizygotic) vs identical (monozygotic) split, using population studies. Basics Female age Prior births Family history … Read more
Enter cycle timing and symptoms to see your chances of implantation vs period and when to test next. Timing Do you know your ovulation date? NoYes Start date of your last period (LMP) Average cycle length (days) Ovulation date Bleeding started on Bleeding details Pattern (pick the closest) Only when wipingSpotting on underwearLight flowModerate flowHeavy … Read more
Estimate your chance of pregnancy from a single encounter using the withdrawal method (sometimes called the ‘pull-out’ method). This simple calculator uses cycle timing and whether use was typical vs perfect. Contraceptive: Withdrawal (pull out method) Do you use this method perfectly? NoYes Date of Intercourse Start Date of Your Last Period Average Cycle Length … Read more
Trying to understand your odds of pregnancy while on the pill? Get a quick, baseline estimate in seconds. Contraceptive: The Pill Do you use this method perfectly? NoYes Date of Intercourse Start Date of Your Last Period Average Cycle Length (Days) Additional Contraceptives (optional) Second method — None —Male CondomCombined pill (the pill)Female sterilizationMale sterilizationWithdrawal … Read more
Use this calculator to estimate your chance of pregnancy from an encounter where a condom was used. Choose whether it was perfect or typical use, then (optionally) add a second method. Your result is per-act, based on peer-reviewed effectiveness data and our modelling. It’s not medical advice—just a clear way to put numbers to a … Read more