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New: One-Tap "Add to Calendar" for Your Due Date and Milestones
The pregnancy due date calculator just got a small but genuinely useful upgrade: a direct "Add due date to calendar" button, sitting right next to Share and Copy link. Here's exactly what it does, how it's different from the milestone calendar you may have already used, and how to get the file into whatever app you keep your life in.
What's new: a due date, downloaded as a calendar event
Short answer: After you calculate a result, a new "📅 Add due date to calendar" button appears in the result row. Tapping it generates a standard .ics calendar file for your estimated due date, right in your browser, and starts the download — no typing the date into your calendar app by hand.
Previously, if you wanted your due date on your actual calendar — not just visible on a webpage — you had to open your calendar app, create a new event, and manually type in the date the tool had just calculated for you. It's a small chore, but it's exactly the kind of small chore a calculator that already knows the date should be able to skip for you. That's what this update does: the due date you just calculated becomes a file your calendar app can open directly.
Two calendar buttons, two different jobs
Short answer: The result row's "Add due date to calendar" button creates one event — your due date. A separate "Download as .ics" button, inside the personalized pregnancy calendar section further down the result, bundles every tracked milestone into a single file instead.
It's worth being precise here, because the calculator now offers two related but distinct exports:
Add due date to calendar — one click, one event, your estimated due date only. This lives directly in the share row alongside Share, Copy link, and PDF/Print, so it's available the instant you see your result.
Download as .ics (milestone calendar) — inside the "Your personalized pregnancy calendar" card, this exports the full table: due date, estimated conception date, trimester starts, viability, full term, and every prenatal test window, all as separate calendar entries in one file.
Illustrative example (not a real result): say a calculated due date lands on December 5. The single-event button gives you one calendar entry labeled around your due date. The milestone-calendar button, by contrast, would hand you a file containing that same December 5 entry plus entries for each trimester start, the week-24 viability marker, week-37 full term, and each screening window — roughly a dozen entries at once. Pick the quick button if all you want is the due date itself; pick the milestone download if you want the whole pregnancy mapped onto your calendar in one go.
Worth noting: both exports use the standard .ics format, so which one is "better" really just depends on whether you want one reminder or the full set — neither replaces the other, and you can use both.
How to use it, step by step
Short answer: Enter your dates, tap Calculate, then tap "Add due date to calendar" in the result row. Your browser downloads a small .ics file; opening that file hands the event to your device's default calendar app, where you confirm the import.
Pick a dating method — last period, conception date, ultrasound, or IVF transfer — and enter the relevant date(s).
Tap Calculate to generate your due date, current week, and trimester.
In the result row, tap 📅 Add due date to calendar. The .ics file downloads immediately.
Open the downloaded file. On a phone, this usually triggers an "Add Event" prompt in your default calendar app; on desktop, it typically opens whichever calendar program you have set as default, ready to confirm the import.
If you also want trimester, viability, full-term, and test-window dates, scroll to the "Your personalized pregnancy calendar" card and use its separate Download as .ics button for the full set.
Where does the calendar file actually come from?
Short answer: The .ics file is built entirely in your browser from the dates you typed in — it's never generated on a server, and nothing about your due date is sent anywhere to produce it.
Because the whole calculator runs client-side, the "Add due date to calendar" button doesn't call out to any backend to build your file — it assembles the calendar event locally, right where your dates already live, and hands the finished file to your browser's normal download mechanism. That matters for something as personal as a pregnancy due date: the only way any of this information leaves your device is if you choose to share the downloaded file yourself, the same way it already worked for the "Copy link" and milestone-calendar features.
Calculate your due date, then try the new one-tap "Add due date to calendar" button for yourself.
What exactly does the "Add due date to calendar" button do?
After you calculate your due date, an "Add due date to calendar" button appears next to Share, Copy link, and PDF/Print. Tapping it generates a single-event .ics calendar file for your estimated due date and downloads it directly in your browser — no account, email, or app install required.
How is that different from the milestone calendar's .ics download?
The "Add due date to calendar" button creates one event: your due date. The separate milestone calendar section, shown below your result, lists every tracked date — trimester starts, viability, full term, and prenatal test windows — as a table, with its own "Download as .ics" button that bundles all of them into one importable file.
Which calendar apps can open the downloaded file?
.ics is a standard calendar file format supported by Google Calendar, Apple Calendar, Outlook, and most other calendar apps. On desktop, opening the downloaded file typically prompts your default calendar app to import it; on mobile, it's usually offered as an "Add to Calendar" or "Add Event" prompt.
Does downloading the calendar file send my dates to a server?
No. The .ics file is generated entirely client-side, in your browser, from the dates you entered. Nothing about your due date or milestone calendar is transmitted anywhere — the file is written locally and handed straight to your browser's download mechanism.
Do I need to create an account to use the calendar download?
No account, sign-up, or email address is needed. Both the single due-date event and the full milestone calendar are available as free downloads immediately after you calculate a result.
A note on methodology: feature details described above were verified directly against the live calculator at time of writing. Any example dates are clearly labeled as illustrative, not real data. This article is for general informational purposes only and is not a substitute for guidance from your doctor or midwife.