Free Ovulation Tracker — Predict Your Fertile Window
Track ovulation and predict your fertile window with Luna's free ovulation tracker. See your ovulation date, fertile window, and get daily fertility insights. Luna is completely free — no credit card, no hidden fees, no app store download required.
What You Get
Everything included, completely free
Ovulation prediction
6-day fertile window
BBT tracking
Cycle calendar
Partner sharing
Free forever
Get Started in 3 Steps
Up and running in under 2 minutes
1
Create your free account
Enter your name, email, and average cycle length. Takes 60 seconds.
2
Log your first period date
Mark the start of your current or last period. Luna immediately calculates your upcoming dates.
3
Track daily & see patterns
Log flow, symptoms, and mood each day. After 2–3 cycles, predictions reach 85–90% accuracy.
FAQ
Frequently Asked Questions
How does Luna predict ovulation?
Luna calculates ovulation based on your average cycle length. Ovulation typically occurs 14 days before your next period. It marks your fertile window (5 days before + 1 day after ovulation) on your calendar.
How accurate is the ovulation prediction?
Predictions are estimates based on cycle patterns. For confirmed ovulation, combine Luna's predictions with BBT (basal body temperature) tracking, which Luna also supports.
What is the fertile window?
The fertile window is the 6-day window around ovulation when pregnancy is possible — typically 5 days before ovulation and the day of ovulation itself.
Can Luna track basal body temperature?
Yes. Luna's daily log includes a BBT field. Tracking your temperature can help confirm ovulation timing.
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