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Conception Planner

Ovulation Calculator

Identify your "Golden Days" for conception. By pinpointing your fertile window, you can time intercourse perfectly to maximize your chances of getting pregnant.

Ovulation Calculator
Predict your most fertile days and maximize conception chances
Medically Reviewed
28 Days

Drag slider to adjust (Normal range: 21-35 days). 28 days is average.

Enter your dates to see your window

Understanding Your Fertile Window

Timing is everything. Many couples are surprised to learn that a woman is only fertile for about 6 days each cycle. This window exists because of the different lifespans of eggs and sperm:

The Egg (12-24 Hours)

Once released from the ovary, the egg survives for only 12 to 24 hours. If it isn't fertilized in this short window, it disintegrates.

The Sperm (Up to 5 Days)

Sperm are resilient. Inside the female body, they can survive and wait for the egg for up to 5 days.

The Goal: Have sperm waiting in the fallopian tube before the egg releases. This is why having sex during the days leading up to ovulation (your fertile window) is crucial.

Signs of Ovulation (Body Check)

This calculator provides a mathematical estimate. You can cross-check it by observing your body's natural signals:

  • 1
    Cervical MucusAs ovulation approaches, your discharge becomes clear, slippery, and stretchy (like raw egg whites). This helps sperm travel.
  • 2
    Basal Body Temperature (BBT)Your resting temperature rises slightly (about 0.5°F) after ovulation occurs. This confirms ovulation happened but is too late for conception that month.

Sex Timing Tips

Doctors recommend having sex every other day during your 6-day fertile window. Daily sex is fine if you prefer, but every other day is sufficient to maintain a supply of sperm without causing "burnout" or stress. The most important days are the 2 days before ovulation and the day of ovulation itself.

Frequently Asked Questions

Can I get pregnant outside my fertile window?
Virtually impossible. To conceive, a viable egg must be present to be fertilized. Once the 24-hour lifespan of the egg has passed, pregnancy cannot occur until the next cycle.
My cycle is irregular. Will this calculator work?
It gives a statistical estimate, but irregular cycles make prediction harder. If your cycle varies by more than a few days each month, we highly recommend using Ovulation Prediction Kits (OPKs) alongside this calculator to detect your actual LH hormone surge.
When should I take a pregnancy test?
It's tempting to test early, but patience pays off. Wait until the first day of your missed period (typically 14 days after ovulation). Testing earlier may result in a "false negative" simply because your hormone levels aren't high enough yet.

Tools & Data Verified by the EverydayCalculators Medical Research Team.

Last updated: January 2026.