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Trying to conceive can feel like a rollercoaster of timing, tracking, and hoping.
Our free ovulation calculator is here to gently guide you through it. Whether your cycles are clockwork or a bit unpredictable, this tool can help you pinpoint your most fertile days and give you a sense of when to test for pregnancy, too.
How to Use Our Ovulation Calculator
- Select the first day of your last period
- Enter your average cycle length (don’t worry, we can help you figure that out)
- Choose how many months you want to see
- Hit “Plan It” to view your personalized fertility calendar
Not sure how long your cycle is? Use our cycle length calculator.
Understanding Ovulation and Your Cycle
What is ovulation?
Ovulation is when your body releases an egg, and it’s the window of time when you’re most likely to conceive.
How many days after your period do you ovulate?
For a 28-day cycle, ovulation usually happens around day 14. But if your cycle is longer or shorter, ovulation might shift too.
What if your cycle is irregular or long?
It can be harder to predict ovulation with irregular cycles, but tracking over several months can help. There are also natural products that support cycle balance if you need a little help.
When Am I Most Fertile?
What days of your cycle are most fertile?
The most fertile time is during the few days leading up to and including ovulation. Sperm can survive a few days, so timing sex a day or two before ovulation is often best.
How long does ovulation last?
Ovulation itself is brief, about 12 to 24 hours, but your fertile window is usually 4 to 5 days long.
When should I have sex to get pregnant?
If you’re trying to conceive, having sex every other day during your fertile window is a common recommendation.
FAQs About Ovulation Calculators
How accurate are ovulation calculators?
Can an ovulation calculator be wrong?
Can I use an ovulation calculator if I have PCOS?
What if I just had a miscarriage?
What if my cycle is shorter than 21 days or longer than 35?
How accurate are ovulation calculators?
They offer a good estimate based on average cycle patterns, but they don’t account for unexpected changes like illness, stress, or hormone shifts.
Can an ovulation calculator be wrong?
Yes, especially if your cycle length varies from month to month. It’s best used as a guide, not a guarantee.
Can I use an ovulation calculator if I have PCOS?
Ovulation can be less predictable with PCOS, so the calculator might not be as accurate. But it can still give you a general idea of your cycle.
What if I just had a miscarriage?
You may ovulate before your next period, but timing varies. It’s okay to use this tool for rough guidance, but check with your provider for personalized support.
What if my cycle is shorter than 21 days or longer than 35?
The calculator is designed for cycles between 21 and 35 days. If yours falls outside that range, you might want to talk with your doctor about what’s going on.
Want Extra Support While You’re Trying to Conceive?
Your body might just need a little extra support to find its rhythm. Hormone-friendly supplements can help promote a more regular cycle and support healthy ovulation.
Explore our Trying to Conceive collection for gentle, natural options.