Conception Calculator
Estimate the date of conception based on the due date or last menstrual period.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Conception Calculator
- Enter a date in either the Due Date or Last Menstrual Period field. You only need one.
- Click Calculate Conception.
- Your estimated conception date will appear below, along with the method used.
What it does:
- If you enter a Due Date, it subtracts 266 days (38 weeks) to estimate conception.
- If you enter a Last Menstrual Period, it adds 14 days to estimate conception.
Note: Dates must be valid calendar dates. No special format required—just pick a date from the date picker.
Previous Results
| Result | Inputs | Date |
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Frequently Asked Questions
The conception date is estimated by subtracting 266 days from the due date (38 weeks) or adding 14 days to the first day of the last menstrual period.
This calculator provides an estimate based on standard pregnancy durations. Actual conception may vary. Consult a healthcare provider for precise dates.
You can enter either the due date or the last menstrual period. If both are entered, only the due date will be used.
