Enter gestational sac length, width, and height to get the mean sac diameter (MSD) and an early gestational age estimate. You can also enter a single MSD and add a scan date for context. Mean Sac Diameter (MSD) ➜ Early Gestational Age Length (mm) Width (mm) Height (mm) Show advanced options Units mm cm Use … Read more

Enter your ovulation date and the first day of your next period. The calculator returns your luteal phase length in days and classifies it as short, normal, or long. Luteal Phase Length Calculator Last ovulation date First day of period (after above ovulation) Show advanced options Counting method (label only) Standard (ovulation → day before … Read more

Instantly estimate how far along you are in weeks and days. Enter your Last Menstrual Period (LMP), Ultrasound date, Conception date, or Due Date to find your current gestational age, due date, and see your baby’s size today. How do you want to calculate? Use Last Menstrual Period (LMP)I already know my Due DateUse Ultrasound … Read more

Enter a fundal height (SFH) in cm to see its percentile for a given gestational age, or switch modes to estimate GA from SFH. You’ll also get the expected SFH, standard deviation, and a ± GA band. Fundal Height (SFH) — Percentile / GA Mode: SFH percentile at a given gestational age Estimate gestational age … Read more

Enter a crown-rump length (CRL) to see gestational age and an estimated due date. You can also pick a target GA to see the expected CRL and a typical range. Crown–Rump Length (CRL) → GA & EDD Units mm cm CRL value (mm) Measurement date (optional) Target GA for expected CRL (optional) Target gestational age … Read more

Took your basal temp at the wrong time? Use this tool to adjust an early or late reading back to your usual check time. It returns the adjusted BBT and the difference. BBT Time Adjuster Usual temperature check time Actual temperature check time Units °F (default) °C Measured temperature (°F) Show advanced options Timing model … Read more

Use this tool to estimate Placenta Accreta Spectrum (PAS) risk based on placenta position and prior caesareans. It returns a simple risk band and educational next steps. Placenta Accreta Spectrum (PAS) Risk Calculator Previa status: None Low-lying Marginal previa Complete previa Prior C-sections Use 3 for 3 or more. Placenta location: Anterior Posterior Show advanced … Read more

Use this tool to interpret vanishing twin risk by week and twin type. It shows risk now, a short projection to next week, and when to seek care. Vanishing Twin / Twin Survival Probability Twin type: Di/Di (two placentas, two sacs) Mono/Di (one placenta, two sacs) Mono/Mono (one placenta, one sac) Gestational age weeks days … Read more

Use this tool to interpret antral follicle count by age. It gives an age-adjusted percentile, a plain-language meaning, and suggested re-test timing. AFC Percentile by Age (Antral Follicle Count) Age (years) AFC count Count from both ovaries on early-cycle ultrasound. Show advanced inputs Cycle day at scan (if known) On hormonal contraception? Yes No PCOS … Read more

Use this tool to interpret a progesterone test in early pregnancy. Enter your value, unit, and gestational age or days past ovulation to see a level band and next steps. Progesterone Level Interpreter (Early Pregnancy) Units: ng/mL nmol/L Progesterone value (ng/mL) Converter: ≈ 57.2 nmol/L Use gestational age or DPO: Gestational age (weeks + days) … Read more