Ovulation Calculator

Find Your Fertile Window

First Day of Your Last Period *

Average Cycle Length (days)

Enter your average cycle length for the most accurate fertile window prediction.

Luteal Phase Length (days)

Usually 12–16 days. Default is 14 days for a typical 28-day cycle.

Your Fertile Window

The 6 days including and leading up to ovulation are your most fertile days.

Fertile Window Starts

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⭐ Ovulation Day (Peak)

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Fertile Window Ends

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Next Period Expected

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Your Monthly Calendar

Period Days

Fertile Days

Ovulation Day (Peak)

Tips to Maximise Your Chances

🕐Timing: Have intercourse every 1–2 days during your fertile window, especially 1–2 days before ovulation.

🌡️BBT Tracking: Track basal body temperature daily — a 0.2°C rise confirms ovulation has occurred.

🔬OPK Tests: Ovulation Predictor Kits detect the LH surge 12–36 hours before ovulation — very accurate.

💊Folic Acid: Start 400mcg folic acid daily at least 3 months before trying to conceive to prevent neural tube defects.

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If you've been trying for 12+ months (or 6 months if age 35+) without success, book a fertility assessment at The Hive Fertility. Early diagnosis leads to much better outcomes.

Tips to Maximise Your Chances

Not Conceiving Despite Trying? Let Us Help.