Sam GormanEstimate 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
Medically 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 … 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
Enter two beta hCG values and their dates to see your doubling time and rate. Compare your rise to typical ranges and view a chart you can save. Units IU/L mIU/mL hCG Draw 1 Date and time hCG (IU/L) hCG Draw 2 Date and time hCG (IU/L) Enter at least two draws with date/time and … Read more
See how levonorgestrel emergency contraceptive pills compare with ulipristal acetate emergency contraceptive pills by hours since intercourse, weight/height, and number of encounters. Get your estimated pregnancy chance and your first accurate test day. Method Levonorgestrel (LNG)Ulipristal acetate (UPA) Hours since intercourse Enter a number from 0 to 168. Female age Advanced options Number of intercourse … Read more
Missed a birth control pill? Enter pill type, how late, where you are in the pack, and whether you had intercourse to estimate your per-act pregnancy risk. No data stored. 💡 Powered by Peer-Reviewed Science Related calculators Contraceptive Risk Per-act risk by method and use quality. Combine Methods Estimate risk when using two methods together. … Read more
Enter your ultrasound date and the gestational age reported on the scan (weeks + days) to get your estimated due date. Ultrasound date Gestational age at scan — weeks Gestational age at scan — days Calculate > EDD: — Gestational age today: — Methodology & sources EDD from ultrasound: EDD = scan date + (280 … Read more