Pregnancy Conception Calculator
Work backward: due dates imply conception roughly 266 days earlier; LMP implies ovulation near day 14.
How the Pregnancy Conception Calculator works
The calculation follows the standard method used across the US — no shortcuts, no hidden assumptions. Here is exactly what happens behind the scenes:
Frequently Asked Questions
How does the Pregnancy Conception Calculator work?
Enter your numbers above and results update instantly using standard formulas, computed entirely on your device.
Is the Pregnancy Conception Calculator free to use?
Yes — completely free with no signup required, and it works on phones, tablets, and desktops.
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Estimate which intercourse date likely conceived, given a due date or birth date.
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Due Date Calculator
Predict your due date from the first day of your last period (adjusted for cycle length) or from conception.
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Ovulation Calculator
Predict ovulation dates and fertile windows from cycle start and length over coming months.
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