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
Reviewed by Dr. Grace Ramosena, MBChB on Jan 25, 2026 Use this hCG calculator with at least 2 beta-hCG blood test results to estimate doubling time or halving time, compare your rise with typical early-pregnancy ranges, and view a chart. hCG Draw 1 Date and time hCG (IU/L) hCG Draw 2 Date and time hCG … 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
Enter your embryo transfer date and embryo day (3/5/6) to get your estimated due date instantly. Had an IUI? The IUI due date calculator gives EDD and key milestones. Transfer date Embryo day at transfer Day 3 (cleavage)Day 5 (blastocyst)Day 6 Pregnancy type (optional) SingletonTwinsTriplets EDD is always 40 weeks; multiples often deliver earlier. We’ll … Read more
Wondering when your twins or triplets are due? Enter your details to get an instant 40-week EDD and the typical delivery window for multiples (based on the dating method you choose). Curious about odds? See the chance of twins for your age and history. Twin & Triplet Due Date Calculator Number of babies Twins Triplets … Read more
Trying to estimate a due date from a specific event? Enter an intercourse date or estimated conception date to get a useful timeline, including likely LMP, gestational age, and pregnancy milestones. Intercourse Date Conception Date Date of Intercourse Assumes conception happens 0 to 2 days after intercourse. Use the Conception Date tab if you know … Read more