Ovulation Calculator — Free
Know your fertile window and next ovulation date — completely free, no registration required.
ℹ️ This is an estimate only — please confirm with your doctorOvulation Calculator
Find your most fertile days to improve your chances of conception.
Key Facts About Ovulation
What is Ovulation?
Ovulation is when a mature egg is released from the ovary — it happens once per cycle and is your most fertile time.
When Does It Happen?
Typically around 14 days before your next period (on average). The exact timing varies by cycle length.
How to Track It?
You can track ovulation using LH surge kits, basal body temperature (BBT) charting, or changes in cervical mucus.
What About PCOS?
With PCOS, ovulation can be irregular or absent. A fertility specialist can help you track and manage your cycle effectively.
Frequently Asked Questions
How do I predict ovulation with PCOS?
With PCOS, cycles are often irregular, making prediction harder. LH surge kits combined with ultrasound monitoring are the most reliable methods. A fertility specialist can create a personalised tracking plan for you.
Is ovulation pain (Mittelschmerz) normal?
Yes, mild one-sided pain or cramping mid-cycle is common and is called Mittelschmerz. However, severe or persistent pain should be evaluated by a doctor.
Can I use this calculator with an irregular cycle?
The calculator works best with regular cycles. For irregular cycles, use your average cycle length as an approximation — but treat the result as a rough guide only. Consult a doctor for more accurate tracking.
LH kit vs ovulation calculator — which is better?
LH kits detect the actual hormone surge that triggers ovulation, making them more accurate for that specific cycle. The calculator gives a prediction based on averages. For best results, use both together.