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Pregnancy Due Date Calculator — LMP, Conception or Ultrasound

Free pregnancy due date calculator. Estimate by last menstrual period, conception date or first ultrasound. Get current week + trimester + days remaining.

When is the baby due?

Estimated due date

Mon, March 1, 2027

Currently

0w 0d · Trimester 1

Days remaining

280

% complete

0%

Standard pregnancy length is ~280 days (40 weeks) from the first day of the last menstrual period (LMP). Only ~5% of babies arrive on the calculated due date — anywhere from 37 to 42 weeks is full-term. Always confirm with your healthcare provider.

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Already know your due date? See your current trimester, track baby age post-birth, or predict your next period if you're trying to conceive.

About this tool

Three ways to estimate the due date

  1. LMP (Naegele's rule): due = first day of last period + 280 days. Adjusts for cycle length other than 28 days.
  2. Conception date: due = conception + 266 days.
  3. First ultrasound: clinician measures gestational age in weeks+days; we back-calculate the LMP and add 280 days.

How accurate is it?

Only about 5% of babies arrive on the calculated date. Anywhere from 37–42 weeks is considered full-term. Confirm with your healthcare provider.

How to use the Pregnancy Due Date Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the Pregnancy Due Date Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the Pregnancy Due Date Calculator.

Is the Pregnancy Due Date Calculator free to use?

Yes. The Pregnancy Due Date Calculatoron 7BusyBoss is completely free — no signup, no paywall, no usage cap.

Do I need to sign up to use the Pregnancy Due Date Calculator?

No. The Pregnancy Due Date Calculatorworks instantly in your browser — no account needed. Signing in with Google is optional and only unlocks features like saving favorites and higher AI build limits.

Does the Pregnancy Due Date Calculator work on mobile?

Yes. Every tool on 7BusyBoss is mobile-responsive and works in any modern browser — Chrome, Safari, Firefox, Edge — on phones, tablets and desktops.

Is my data safe when I use the Pregnancy Due Date Calculator?

Yes. The Pregnancy Due Date Calculatorruns entirely in your browser — your inputs never leave your device unless the tool explicitly fetches public data (e.g. currency rates). We don't store the values you type.

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