Ovulation Calculator
The Ovulation Calculator estimates the most probable ovulation/fertile window as well as other related dates. The estimations are based on a woman's last period date. This calculator should not be used as a form of birth control.
Ovulation Calculator
Predict your fertile days and increase your chances of conception
Calculate Your Ovulation
About Ovulation & Conception
Understanding Ovulation
Ovulation is the process where ovarian follicles rupture and release one or more mature eggs from the ovaries. On average, ovulation occurs within the 4 days before or after the midpoint of a menstrual cycle (14 days before the start of the next period).
Fertile Window
Days 10-18 of the menstrual cycle are typically the most fertile phase. While an egg can only be fertilized for 12-24 hours after release, sperm can survive inside a woman's body for up to five days. Regular intercourse five days before and on the day of ovulation can improve the likelihood of conception.
Ovulation Prediction Methods
Tracking Menstrual Cycles: This calculator uses cycle tracking to predict ovulation. Women with regular cycles can fairly easily determine when they are ovulating.
Basal Body Temperature (BBT): Your BBT is your temperature when you first wake up. It's generally lowest right before ovulation and rises by about 0.5 degrees during ovulation.
Ovulation Kits: These tests detect hormone surges that precede ovulation by 24-48 hours. While 99% accurate in detecting hormones, they can't guarantee exactly when ovulation will occur.
Results
Ovulation Window
Sep 18 - Sep 22
Most Probable Ovulation Date
Sep 20, 2025
Intercourse Window for Pregnancy
Sep 15 - Sep 22
Pregnancy Test
Sep 29, 2025
Next Period Start
Oct 4, 2025
Due Date If Pregnant
Jun 13, 2026
September 2025
| S | M | T | W | T | F | S |
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Important dates for the next 6 cycles:
| Period Start | Ovulation Window | Due Date |
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