Pregnancy Calculator
Estimate your due date and current pregnancy week from the first day of your last period.
Inputs explained
- Last Menstrual Period (LMP) — The first day of your most recent period. The due date is calculated 280 days from this.
How to use it
- Fill in the fields above — each input has a hint describing exactly what to enter
- Press Calculate to get your result instantly, right on this page
- Copy the result, save the tool to favorites, or share and embed it anywhere
Understanding the result
Example: An LMP of Jan 1 gives an estimated due date around Oct 8.
Frequently asked questions
Is the Pregnancy Calculator free to use? Yes — it is completely free, with no sign-up, no download and no usage limits. You can use it as often as you need.
Is my data private? Yes. The calculation runs entirely in your browser — the values you enter are never sent to our servers, stored or shared with anyone.
What information do I need? Just the following: Last Menstrual Period (LMP). Each field includes a hint explaining exactly what to enter.
Can I use it on my phone? Yes — the tool is fully responsive and works on any device, and the same calculator is available in the EasyWorkCalcs mobile app.
Privacy
Everything you enter into the Pregnancy Calculator is processed entirely in your browser. Nothing is uploaded, stored or shared — your data stays on your device.