By Team Hypomnema · Updated October 19, 2026
Estimate due dates, gestational weeks and trimester milestones using a period date, conception, IVF transfer or clinician-set date.
Use the calculator
Choose last period, known conception, IVF transfer or a clinician-set due date.
Enter dates and adjust the cycle length or embryo age where applicable.
Review weeks, trimester and calendar milestones. Save a summary or calendar.
Understand the limits
Calendar estimates do not confirm pregnancy or predict the exact birth date. Irregular cycles reduce LMP accuracy. Your clinician’s established dating takes priority. Inputs stay in browser memory.
Keep your information private
Calculations run on your device. Inputs are not saved to browser storage or sent to a calculation server. Downloading explicitly creates a file on your device; calendar files can contain sensitive estimates. Choose where you store or import them.
Try the workflow
Keep your original documents and review the output. You can also browse all guides or contact Team Hypomnema.