Due Date Calculator
An estimated pregnancy due date and the week you are in.
FREE - NO SIGN-UP - RUNS ON YOUR DEVICE
Your dates stay on your device
- 2ways to start
- Weekwhere you are today
- Liveupdates as you type
- 0data uploaded
Due Date Calculator at a glance
- Input
- Last period or conception date
- Output
- Due date, current week, basis
- What it is not
- One date in, an estimate out
- Other kinds of due date
- Pregnancy dates only
- Health notice
- Estimate, not medical advice
- Processing
- Runs locally in your browser
- Price
- Free
- Account required
- No
How to use Due Date Calculator
- 1
Choose the date you have
Choose the starting date.
- 2
Type it in
Enter the date.
- 3
Read the basis
Check the basis shown.
Frequently asked questions
Is this a due date for an invoice or a project?
No. This panel is for pregnancy only. It takes a last period or conception date and returns an estimated delivery date and the current week.
How exact is a due date?
It is an estimate from a single date and an assumed cycle length. Arrivals spread out around it, and no arithmetic here changes that.
Which date should I use?
Whichever one you actually know. Last period is the usual starting point; conception is offered when that is the date you have.
Does the date leave my browser?
No. It is used for the arithmetic in this tab and is not sent to a server or stored after the page closes.
What a due date estimate rests on
This one is for pregnancy. Choose last period or conception, enter the date, and the estimated due date, the current week and the basis for both appear together.
- One date and an assumed cycle length. Change either and the estimate moves with it.
- The current week is counted from the same starting point, so it shifts if the date does.
- Care decisions belong with a qualified health professional, who has more than a date to work from.
Full specification
| Input | Either the first day of the last period, or the conception date. One or the other. |
|---|---|
| Output | An estimated due date, the week you are in now, and the basis used. |
| What it is not | A pregnancy test, a scan reading, or anything that knows more than the date you typed. |
| Other kinds of due date | Not covered. This panel is for pregnancy dates and nothing else. |
| Health notice | This result is an estimate for general information and is not medical advice. |
| Processing | All calculations run locally in the current browser tab. |
| Price | Free |
| Account required | No |
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