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Due Date
Calculator

Estimate your pregnancy due date, current week, and trimester from your last menstrual period, conception date, or IVF embryo transfer. Everything runs in your browser.

Last menstrual period
days

Naegele's rule: due date ≈ first day of last period + 280 days, adjusted for cycle length.

Conception date

Due date ≈ conception date + 266 days. Gestational age counts ~2 weeks more.

IVF embryo transfer

Due date ≈ transfer date + (266 − embryo age) days.

This calculator gives a general estimate only and is not medical advice. Estimated due dates and gestational age vary, and only a small share of births occur on the exact date. Always confirm with your doctor or midwife.