Pregnancy Countdown Calculator
Days, weeks and percent of pregnancy completed and remaining — with the 'due month' framing midwives prefer.
The 'due month' line is the honest one — half of first babies arrive after 40w5d, and 90% of all babies arrive inside the ±2-week window shown. Planning around the window (bags, leave, backup contacts) beats planning around a single date that has a 4% hit rate.
Formula
For general information only. Pregnancy and infant care decisions must be guided by your treating clinician or midwife — always defer to their assessment.
Days, weeks and percent of pregnancy completed and remaining — with the 'due month' framing midwives prefer. The Pregnancy Countdown Calculator is a free, private pregnancy countdown tool — every result computes instantly in your browser with no sign-up and no data upload.
About Pregnancy Countdown Calculator
The 'due month' line is the honest one — half of first babies arrive after 40w5d, and 90% of all babies arrive inside the ±2-week window shown. It applies remaining = EDD − today; complete % = (280 − remaining) ÷ 280. Use the Pregnancy Countdown Calculator to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Pregnancy Countdown Calculator
- 1Enter your details in the Pregnancy Countdown Calculator input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Pregnancy Countdown Calculator?
- ✓Instant pregnancy countdown result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Jukic AM et al., Hum Reprod 2013 — length of human pregnancy)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Pregnancy Countdown Calculator work?+
The 'due month' line is the honest one — half of first babies arrive after 40w5d, and 90% of all babies arrive inside the ±2-week window shown. The calculation uses the formula: remaining = EDD − today; complete % = (280 − remaining) ÷ 280. Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Pregnancy Countdown Calculator accurate, and what is it based on?+
The method is traceable to authoritative sources: Jukic AM et al., Hum Reprod 2013 — length of human pregnancy. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Pregnancy Countdown Calculator free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is informational only. Always defer to your treating clinician or midwife for pregnancy and infant care decisions.
What can I use the Pregnancy Countdown Calculator for?+
It's commonly used for pregnancy countdown, days until due date, pregnancy percent complete. Days, weeks and percent of pregnancy completed and remaining — with the 'due month' framing midwives prefer.
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