Helpful Tools
Choose a calculator to get fast, private results. We keep the overview short so you can see more tools immediately.
📅Ovulation Calculator
Calculate your fertile window and ovulation date based on your cycle length and last period date.
What this tool includes
- Predicts ovulation date
- Shows fertile window
- Works with any cycle length
- 100% private calculations
👶Due Date Calculator
Find out your estimated due date and track your pregnancy progress week by week.
What this tool includes
- Accurate due date estimation
- Pregnancy week tracking
- Trimester breakdown
- Key milestone dates
📊Period Tracker
Track your periods, symptoms, and cycle patterns with our web-based period tracker.
What this tool includes
- Period and symptom logging
- Cycle pattern analysis
- Predictive calendar
- Export your data
📈Fertility Calendar
Visual calendar showing your cycle phases, fertile days, and important dates.
What this tool includes
- Visual cycle representation
- Fertile day highlighting
- Cycle phase indicators
- Customizable view
📅Date Calculator
Calculate future dates, count days between dates, and find out what date is X days, weeks, or months from today.
What this tool includes
- Days/weeks/months from today
- Days between two dates
- Weeks in months calculation
- Quick pregnancy milestones
🔄Cycle Length Calculator
Find your average menstrual cycle length by entering the start dates of your recent periods.
What this tool includes
- Average cycle length
- Cycle range & variation
- Next period prediction
- 100% private calculations
⏱️Period Length Calculator
Find your average period duration by entering the start and end dates of your recent periods.
What this tool includes
- Average period duration
- Period range & consistency
- Normal range check
- 100% private calculations
🎯Fertility Timing Calculator
Calculate the best time to have sex to get pregnant with our comprehensive fertility calculator.
What this tool includes
- Personalized fertile window
- Optimal timing recommendations
- Cycle-based predictions
- 100% private calculations
How Our Tools Work
Enter Your Information
Provide basic details like your last period date and average cycle length. All data stays private on your device.
Get Accurate Calculations
Our algorithms use proven methods to calculate ovulation dates, fertile windows, and due dates with high accuracy.
Track and Plan
Use the results to plan your pregnancy journey, track your cycle, or simply understand your body better. If you want to keep everything in one place, try the bloom period & ovulation tracking app (privacy-first and free on iOS).
Want deeper tracking after your calculations? You can get these tools in the Bloom app and keep everything synced in one private routine.
Read next: timing and birth control deep-dives
Use these guides after running a calculator so you can act on your results with confidence.
Your Privacy is Protected
All our tools are designed with privacy in mind. Your personal data never leaves your device and is never shared with third parties.
- No data collection or storage
- Calculations happen locally
- No tracking or analytics
- 100% anonymous usage
Need all your tracking in one private app?
Try the bloom App
Move from one-off calculations to daily tracking. Bloom keeps your cycle, birth control, reminders, and insights in one ad-free private app.
