Reviewed by Dr. Sony Sherpa, MBBS, MD on Dec 22, 2025 Use this calculator to estimate twin odds for one pregnancy. Use the Optional details section to explore factors associated with natural twinning. Female age Prior births Family history of twins NoYes (maternal side)Yes (paternal side)Yes (both sides) Have you had twins before? NoYes Fertility … Read more

Enter cycle timing and bleeding details to compare implantation spotting with a period and see when to take a pregnancy test. 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 … 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

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

Enter the pill type, the timing of the missed dose and intercourse, and any emergency contraception to see an estimated pregnancy chance, a broad model range, next-step guidance, and a pregnancy-test date. Pill type ? Choose Combined or POP. If you choose POP, a second field asks which formulation because missed-dose windows differ. Combined pillProgestin-only … 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: — Related calculators Conception date from your scan Estimate conception and the likely … 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