Pregnancy Conception Calculator
Find your conception date and fertile window for pregnancy planning.
Most Likely Conception Date
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Fertile Window
Estimated Due Date
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Conception Timing Explained
Conception occurs when sperm meets egg. Sperm can survive up to 5 days in the female reproductive tract, while the egg survives about 1 day after ovulation. This creates a 6-day fertile window.
Factors That Affect Conception Timing
- Cycle length variations affect ovulation day
- Sperm survival (up to 5 days)
- Egg viability (about 24 hours)
- Ovulation timing (typically cycle day 14 in 28-day cycles)
Related Tools
Pregnancy Calculator
Full pregnancy timeline.
Due Date Calculator
Calculate delivery date.
Frequently asked questions
How do I calculate conception date?
Conception typically occurs 14 days after LMP (ovulation). Subtract 14 days from due date to get approximate conception date.
What is conception window?
Sperm survives up to 5 days, egg survives 1 day. Conception window spans about 6 days before ovulation to 1 day after ovulation.
How accurate is conception calculator?
Conception date estimate is within 1-2 days if cycles are regular. Irregular cycles reduce accuracy.
When did I conceive based on due date?
Subtract 266 days (38 weeks) from due date. This assumes full-term pregnancy and typical ovulation timing.
What is the fertility window?
The 6-day period ending on the day of ovulation. Highest chance of conception is 1-2 days before ovulation.