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Tool

Week by week, but for you

Every week-by-week pregnancy tracker tells you the baby is the size of a mango. This one tells you what she's dealing with this week, what your actual job is, and what decision is now due. Put the due date in — it stays in your browser.

A due date is the middle of a window, not a deadline

Births within the normal range
37–42 weeksMost first babies arrive after the estimated date.
The estimate itself
40 weeksFrom the last period, adjusted by the dating scan.

Source · NHS — Your pregnancy week by week · Reviewed JUL 2026

DadPrep editorial · Updated 29 July 2026 · Works offline, nothing leaves your browser

How this tool works out your week

There is no cleverness in here and nothing is sent anywhere. It is one subtraction, done in your browser.

  1. You enter the estimated due date — the one from the dating scan, not the one from the app.
  2. The tool counts the days between today and that date, and divides by seven.
  3. It subtracts that from 40 to get the week you are in, and shows the entry for that week.
  4. The date is stored in your own browser's local storage. Clearing your browser data clears it, because there is nowhere else it exists.

current week = 40 − ((due date − today) ÷ 7)

Method · NHS — Your pregnancy week by week · Reviewed JUL 2026

A word on due dates

A due date is a 40-week estimate from the last period, adjusted by the dating scan. It is not a deadline — most first babies arrive after it, and a birth anywhere from 37 to 42 weeks is within the normal range. Treat the date as the middle of a window, and be very careful about telling extended family the exact day.

Sources

1 source · Reviewed JUL 2026 · Editorial policy

Every figure on this page links to its primary source. If one is out of date, tell us and we'll fix it.

Not by us · a paid book

Nobody hands you a guide for this part.

Arron — a good friend of mine — wrote the one he wishes someone had given him: Things I Wish I Knew Before You Were Born. 59 pages, twelve stages, from the positive test to the first birthday. Birth-plan checklist, swaddle guide, choking-response steps, babywearing positions — plus the honest chapters most books skip: your head, your relationship, your in-laws, and looking after yourself.

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How this link works. Things I Wish I Knew Before You Were Born is Arron's book, not ours, and the link goes straight to his own checkout page. There is no commission arrangement in place yet, so DadPrep earns nothing if you buy it today. We recommend it because it's the one we'd hand a mate. If that ever changes this sentence changes with it, and either way the price you pay is $37.