UK Ovulation Calculator
Predict your ovulation date, fertile window, and next period. Based on NHS guidelines and standard fertility tracking methods.
Ovulation Predictor
Fertile Window
Next Period & Cycle
Your Ovulation Prediction
How Ovulation Calculators Work
Ovulation typically occurs 12–16 days before your next period. The most fertile days are the 5 days leading up to ovulation and the day of ovulation itself. This tool uses standard medical calculations.
Note: This is an estimate. For best accuracy, track your cycle for several months or use ovulation test kits.
Frequently Asked Questions
Have intercourse every 2–3 days during your fertile window (5 days before ovulation + ovulation day).
It is a good estimate for regular cycles. Women with irregular cycles should consult a GP or use ovulation predictor kits.
Between 21 and 35 days is considered normal. The average is 28 days.