Due Date Calculator

Due Date Calculator estimates when your baby is likely to arrive, using the date of your last menstrual period. Enter a few numbers and instantly see your estimated due date, how many weeks and days along you are, your current trimester, and an estimated conception date — all in a calm, easy-to-read design. HOW IT WORKS The app uses Naegele's rule, the standard method used around the world: it adds 280 days (40 weeks) to the first day of your last menstrual period (LMP), assuming a typical 28-day cycle. For example, an LMP of January 1, 2024 gives an estimated due date of October 7, 2024. WHAT YOU GET - Estimated due date from your last period - Current gestational age in weeks and days - Your trimester (first, second or third) at a glance - Days remaining until the due date - Estimated conception date - A pregnancy timeline showing all three trimesters with week ranges and a marker for where you are now - A plain-language Learn section explaining the method SIMPLE AND PRIVATE - Works fully offline — no account, no sign-in - Plain numeric date fields, no fuss - Light and dark themes that follow your system - Small, fast and clean AN ESTIMATE, NOT MEDICAL ADVICE Every pregnancy is different. Cycle length and ovulation timing vary, so the real date can differ, and only about 1 in 20 babies arrive exactly on the due date — most are born within two weeks either side. An early ultrasound gives a more precise estimate. This app is an educational tool and is not medical advice or a substitute for professional care. Always consult your healthcare provider for guidance about your pregnancy. ADS & PRIVACY This app shows ads via Google AdMob. AdMob may use a device advertising identifier to serve and measure ads. The calculator itself works entirely on your device and does not require your personal data to function.