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.