Pregnancy Due Date Calculator
Get an estimated due date and current week as you type.
FREE - NO SIGN-UP - RUNS ON YOUR DEVICE
Your entries stay on your device
- Liveupdates as you type
- 0data uploaded
- 1clear result
- Freeno account needed
What you can count on
- 0data sent
- Calculations run in this browser
- Entries stay on this device
- Liveresult
- Figures update as values change
- Copy the summary when ready
- Clearmethod
- Inputs and formula basis shown
- Estimate, not medical advice
Pregnancy Due Date Calculator at a glance
- Input
- Last period or conception, and its date
- Output
- an estimated due date and current week
- Health notice
- Estimate, not medical advice
- Processing
- Runs locally in your browser
- Days counted
- 280 from LMP, 266 from conception
- Price
- Free
- Account required
- No
How to use Pregnancy Due Date Calculator
- 1
Enter your values
Choose last period or conception, then enter its date.
- 2
Review the estimate
See the estimated due date, current week and calculation basis.
- 3
Copy the result
Use Copy result to save the displayed summary for your own notes.
Frequently asked questions
Is this result medical advice?
No. It is a general estimate based on the values and formula shown. A qualified health professional can interpret measurements for your circumstances.
Are my entries uploaded?
No. The calculation runs in your current browser tab, and the tool does not send the values to a server.
Why might my result differ elsewhere?
Methods, rounding and reference assumptions vary. Check the selected units and inputs, then treat the result as an estimate rather than a diagnosis.
I entered a date and got a message instead of a due date.
Two dates are turned away: one in the future, and one more than 315 days back. Neither can be the start of a pregnancy that is still running, so the page says so instead of guessing.
Understanding the estimate
Choose last period or conception, then enter its date. See the estimated due date, current week and calculation basis. This calculator provides an estimate, not medical advice.
- The result follows the method named in the tool and rounds figures for easy reading.
- Personal circumstances vary, so use the figure as a general reference and not a diagnosis.
Full specification
| Input | Choose last period or conception, then enter its date. |
|---|---|
| Output | See the estimated due date, current week and calculation basis. |
| 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. |
| Days counted | 280 days from the last period, or 266 from conception. Both are the standard counts. |
| Price | Free |
| Account required | No |
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