Pregnancy Due Date Calculator: Due Date and Weeks Pregnant

Find your estimated due date from the first day of your last period, how many weeks pregnant you are today and which trimester you are in.

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How to use the pregnancy due date calculator

1. Type your numbers in the boxes (pick your currency or units if asked).
2. The answer updates as you type: no button to press.
3. Copy the result, or share it on WhatsApp with one tap.

Questions

How is the due date worked out?

Naegele’s rule: 280 days (40 weeks) after the first day of your last period, adjusted if your cycle is longer or shorter than 28 days.

Is my data private?

Yes. Everything happens inside your own browser: nothing you type or choose is uploaded to us or anyone else.

Is it free?

Completely free, with no sign-up, no watermark and no limit on how many times you use it. Light ads keep the site running.