Ovulation Calculator

Predict your ovulation and fertile window

First day of your last period:

Average cycle length (days):

Tip: Your fertile window usually starts 5 days before ovulation. Tracking it helps improve your chances of conception.

Track Your Fertile Window Easily

Understanding when you ovulate is one of the most powerful tools for planning a pregnancy. Our Ovulation Calculator helps you estimate:

Your ovulation day
Your fertile window (the days you’re most likely to get pregnant)
The expected start date of your next period

And the best part? No signups, no personal data required. Your journey stays private.

How to Use the Ovulation Calculator

Using this tool is super simple:

Select the first day of your last period
Enter your average cycle length (typically between 21–35 days)
Click "Calculate"

You’ll instantly see:

The 5-day fertile window
Your estimated ovulation day
When your next period is likely to start

Why Knowing Your Ovulation Matters

Your chances of getting pregnant are highest during your fertile window, which is typically the 5 days leading up to and including your ovulation day.

🔍 Ovulation usually occurs about 14 days before your next period, but it can vary depending on your cycle.

By using this tool:

You increase your chances of conceiving naturally
You learn more about your unique menstrual cycle
You avoid the guesswork and stress

Quick Fertility Facts

🕒 Sperm can live inside the female body for up to 5 days
🧬 An egg survives about 12–24 hours after ovulation
🌸 Most people ovulate around day 14 of a 28-day cycle, but not everyone has a 28-day cycle

Bonus Tips to Boost Fertility

🥗 Eat a balanced diet rich in folate, zinc, and omega-3s
💧 Stay hydrated — cervical mucus plays a key role in fertility
💤 Sleep well and manage stress (high stress can delay ovulation)
❤️ Track your cycle for a few months to spot patterns

Common Questions About Ovulation

How accurate is this Ovulation Calculator?

It provides an estimate based on your inputs. For more accuracy, combine it with signs like basal body temperature or ovulation predictor kits.

Can I get pregnant outside the fertile window?

It’s unlikely, but not impossible. Fertility peaks during the fertile window, especially the day before and the day of ovulation.

What if I have irregular periods?

You can still use the tool, but results may vary. It’s a good idea to track several cycles and consult your doctor if you’re unsure.

Note:

This calculator is a general guideline and not a replacement for professional medical advice. Always speak to your doctor if you’re having trouble conceiving or have health concerns.

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Start Using the Ovulation Calculator Now

Just enter your last period date and average cycle length above — and let Glow Mama Tools help you take the next step in your fertility journey 💚