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Pregnancy Due Date

The standard method is Naegele's rule: take the first day of your last menstrual period (LMP), add 280 days (40 weeks), and that is the estimated due date. The calculator does this automatically and assumes a 28-day cycle with ovulation on day 14. If your cycle is longer or short

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The standard method is Naegele's rule: take the first day of your last menstrual period (LMP), add 280 days (40 weeks), and that is the estimated due date. The calculator does this automatically and assumes a 28-day cycle with ovulation on day 14. If your cycle is longer or short

This free Pregnancy Due Date from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.

How to use the Pregnancy Due Date

  1. Enter your inputs (date, amount, rate, etc.).
  2. Pick any optional settings (tax mode, country, unit).
  3. Read the result - most calculators update as you type.
  4. Copy the result, or screenshot the breakdown for your records.

What you can do with the Pregnancy Due Date

  • Quick personal-finance maths before a major purchase.
  • Tax estimates for freelancers and small businesses.
  • Verify a number on an invoice or receipt.
  • Help kids with homework calculations.

Why use KX Toolkit's Pregnancy Due Date

  • Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
  • Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
  • Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
  • Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
  • One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.

Tips for the best results

For currency-aware calculators (GST, tax), always confirm the rate matches the jurisdiction on your invoice - rates change yearly.

Related Calculators

If you find this tool useful, explore the full Calculators collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.

How is the due date calculated?
The standard method is Naegele's rule: take the first day of your last menstrual period (LMP), add 280 days (40 weeks), and that is the estimated due date. The calculator does this automatically and assumes a 28-day cycle with ovulation on day 14. If your cycle is longer or shorter, the date can be adjusted to match your actual ovulation timing.
How accurate is the LMP-based due date?
Only about 4 to 5 percent of babies are born on the exact predicted date. About 80 percent arrive within 10 days either side. An early ultrasound (between weeks 8 and 13) is more accurate than LMP because it measures the embryo directly. If you have irregular cycles or do not remember your LMP, your doctor will use ultrasound dating instead.
What if my cycle is not 28 days?
If your cycle is longer than 28 days, ovulation happens later and the due date shifts later by the same amount. For a 32-day cycle, add 4 days to the calculated date. For a 25-day cycle, subtract 3. The calculator can take a custom cycle length and adjust automatically. Very irregular cycles make this method unreliable, so an ultrasound is the best confirmation.
When does each trimester start and end?
Trimester one runs from week 1 to the end of week 13. Trimester two is weeks 14 through 27. Trimester three is week 28 to birth, typically around week 40. Note that pregnancy weeks are counted from the LMP, not from conception, so you are technically about two weeks "pregnant" before conception happens in this counting system. It is a clinical convention, not a biological one.
Is this calculator a substitute for prenatal care?
No. This is an estimate for planning purposes only. Every pregnancy needs medical supervision, including ultrasounds, blood tests, and regular checkups. The exact due date, fetal development, and any concerns should always be confirmed by your doctor or midwife. If you suspect you are pregnant or have any pregnancy-related symptoms, schedule a clinical appointment as soon as possible.
Can the calculator predict whether the baby will arrive early or late?
No. It only computes a single estimated date based on standard assumptions. Whether you deliver early, on time, or late depends on many factors including your health, the baby's development, and chance. First pregnancies often go a few days past the due date on average. Babies born between 37 and 42 weeks are considered full-term and the timing is mostly out of anyone's control.

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