Free Ovulation Calculator - Track Your Fertile Window
Calculate your ovulation date and most fertile days. Best free ovulation calculator 2025 - essential for pregnancy planning or cycle awareness.
Quick Answer
Ovulation typically occurs 14 days before your next period (not 14 days after your last one). For a 28-day cycle, ovulation is around day 14. The fertile window is 5 days before ovulation through ovulation day. Enter your cycle details at practicalwebtools.com to calculate your personal fertile window.
Key Facts about Ovulation Calculator:
- Ovulation occurs approximately 14 days before next period
- Fertile window: 5 days before ovulation + ovulation day
- Egg survives 12-24 hours after ovulation
- Sperm can survive up to 5 days in female body
- Most fertile: 1-2 days before ovulation
- Signs: cervical mucus changes, basal temp rise, mittelschmerz
- Cycle length varies; ovulation timing varies accordingly
Why Use Our Ovulation Calculator?
Track your fertility:
Ovulation Date
Calculate when you ovulate.
Fertile Window
See your most fertile days.
Cycle Calendar
Visual cycle overview.
Multiple Cycles
Project future ovulation dates.
Instant Results
Get fertile days immediately.
100% Private
Your cycle data stays private.
How to Ovulation Calculator in 3 Easy Steps
Calculate ovulation:
Enter Last Period
First day of your last period.
Set Cycle Length
Your typical cycle length.
See Fertile Days
View ovulation and fertile window.
Know Your Fertile Days
Optimize timing for conception
Understand your cycle better
Track fertility patterns
Plan ahead with calendar view
Common Use Cases for Ovulation Calculator
Essential for:
Frequently Asked Questions
Everything you need to know about our ovulation calculator
When do I ovulate?
14 days before next period; day 14 for 28-day cycles.
Ovulation typically occurs 14 days before your next period starts (not 14 days after the last one). For a 28-day cycle, this is around day 14. Longer cycles ovulate later.
What is the fertile window?
6 days: 5 days before ovulation through ovulation day.
The fertile window is 5 days before ovulation plus the day of ovulation (6 days total). Sperm survive up to 5 days; the egg lives 12-24 hours.
How accurate is an ovulation calculator?
Estimate based on typical 14-day luteal phase; combine with tests for accuracy.
Calculations assume a typical luteal phase (14 days). Individual variation exists. Combine with ovulation tests or basal body temperature for higher accuracy.
What are signs of ovulation?
Cervical mucus changes, temperature rise, ovulation pain, positive OPK.
Signs include: egg-white cervical mucus, slight temperature rise, mittelschmerz (ovulation pain), increased libido, and positive ovulation tests.
Still have questions? Try the tool yourself!
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