Conception Calculator

Result

Important dates for this cycle:

Most Probable Conception DaysSep 30, 2025 - Oct 9, 2025
Ovulation WindowSep 30, 2025 - Oct 8, 2025
Best Intercourse Days for PregnancySep 25, 2025 - Oct 8, 2025
Pregnancy TestOct 13, 2025
Next Period StartOct 18, 2025
Due Date If PregnantJun 27, 2026

Conception Calendar

September 2025
SMTWTFS
123456
78910111213
14151617181920
21222324252627
282930

Next 6 Cycles

Period StartConception WindowDue Date
Sep 20, 2025Sep 30, 2025 - Oct 9, 2025Jun 27, 2026
Oct 18, 2025Oct 28, 2025 - Nov 6, 2025Jul 25, 2026
Nov 15, 2025Nov 25, 2025 - Dec 4, 2025Aug 22, 2026
Dec 13, 2025Dec 23, 2025 - Jan 1, 2026Sep 19, 2026
Jan 10, 2026Jan 20, 2026 - Jan 29, 2026Oct 17, 2026
Feb 7, 2026Feb 17, 2026 - Feb 26, 2026Nov 14, 2026

About Conception

This calculator estimates the most likely conception days for the next six cycles based on your last period and cycle length. Conception occurs when a sperm fertilizes an egg during the fertile window (days 10-18 of the cycle). Regular intercourse 5 days before and on ovulation day increases pregnancy chances. This tool is not for birth control.

Conception Tips

  • Track Cycles: Monitor periods to identify fertile windows.
  • Basal Body Temperature: Note temperature rise (~0.5°F) post-ovulation.
  • Cervical Mucus: Look for egg-white mucus before ovulation.

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Conception Tips

  • Have regular intercourse every 2-3 days, especially in the fertile window.
  • Track basal body temperature to confirm ovulation.
  • Monitor cervical mucus for fertile-quality (egg-white) texture.
  • Consult a doctor for irregular cycles or conception challenges.

Key Conception Facts

  • Fertile Window: Days 10-18 of cycle, peaking at ovulation.
  • Sperm Viability: Survives up to 5-7 days in the body.
  • Egg Lifespan: Viable for 12-24 hours post-ovulation.