Free pregnancy week calculator
How far along are you?
Type the due date. We will do the tender math, and give you back the week you are on, the trimester, and how many days there are to go. Nothing clinical to fill in.
Add the due date above and the weeks will appear.
A gentle tracker, not medical advice. Babies keep their own schedule.
The dates you type stay in this browser. Nothing is stored, uploaded, or sent anywhere.
The weeks are worth keeping
A number is nicer when there is a photo beside it.
Knowing you are at week 25 is one thing. Seeing week 25 sitting next to the photo you took that morning is another. Our Pear Tree keeps a pregnancy photo journal that runs on the same single date you just typed: every bump photo, scan, and voice memo files itself to the right week on its own, so a doorway photo a week quietly becomes a flip-book of the whole nine months.
And when the baby arrives, the counting does not start over. The weeks simply become an age, which our milestone photo maker works out for you and writes onto the photo.
Questions
About counting the weeks
How does this work from just the due date?
A pregnancy is counted as a 40 week arc, 280 days long, that finishes on the day your baby is expected. So the due date is all we need. We count back from it to find the day you are standing on, and forward to see how much of the arc is left. There is nothing else to fill in.
What are the trimesters?
Lightly held: the first trimester runs up to week 13, the second covers weeks 14 through 27, and the third begins at week 28 and carries on to the finish. The calculator names the one you are in without making a fuss about it.
Is this medical advice?
No. It is a gentle way to keep track of the weeks, and nothing more. Your midwife or doctor is the word that counts, and if their dating is different from what you see here, theirs is the one to trust.
Can I check a past or future date?
Yes. The second field starts on today, but you can move it to any day you like. It is useful for labelling a bump photo you took three weeks ago, or for seeing which week a date already on your calendar will land in.
Why weeks instead of months?
Because weeks are the language of pregnancy. Appointments, scans, and the little updates you read all count in weeks, and a week is a good unit for a keepsake too. Months are four different lengths depending on which one you are in, so they blur the arc rather than mark it.
The countdown is sweeter when you keep it.
Start a private family timeline while you are still counting weeks. Free to begin.
Start freeFree to start · No credit card · Your photos stay yours