Safe Days Calculator
Identify the days with the lowest risk of pregnancy during your cycle.
Safe Days Calculator
App • Fertility & Cycle Tracking
🔒 100% Private & On-Device
Track Your Cycle & Fertility Safely
Keep your ovulation, period, and fertility health private. No accounts, no ads, zero data tracking.
How to calculate safe days
Estimate the days with the lowest risk of pregnancy based on your menstrual cycle length.
1
Cycle length
Your cycle length helps determine the fertile window.
2
Last period
We use this to establish the start of the cycle.
3
Safe days prediction
The days outside the fertile window and sperm lifespan are considered 'safe'.
Common Questions
Are safe days 100% effective?
No, the calendar method is not a reliable contraceptive on its own. Hormones can fluctuate.
What is Avoid Mode?
Bloom Private offers a mode dedicated to tracking these days securely without saving data in the cloud.
Steps For
Natural planningCycle trackingAvoid pregnancy
Related Resources
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