Instantly calculate your menstrual cycle, fertile window & next period date. 100% free, no signup needed. Try our smart period tracker now!
Enter Your Cycle Details
Your Cycle Predictions
| Cycle | Next Period | Ovulation Day | Fertile Window |
|---|---|---|---|
| Cycle 1 | June 29, 2025 – July 3, 2025 | July 13, 2025 | July 8, 2025 – July 14, 2025 |
| Cycle 2 | July 27, 2025 – July 31, 2025 | August 10, 2025 | August 5, 2025 – August 11, 2025 |
| Cycle 3 | August 24, 2025 – August 28, 2025 | September 7, 2025 | September 2, 2025 – September 8, 2025 |
Period Calculator – Accurately Track Your Menstrual Cycle & Ovulation
Predict your next period, fertile window & ovulation days in seconds! Our free online Period Calculator helps women plan pregnancies, track cycles, and understand their bodies better.
Why Use Our Smart Period Tracker?
✔ Most Accurate Predictions – Uses medical-standard cycle calculations
✔ Fully Private – No registration or data storage
✔ 3-in-1 Results – Shows periods, ovulation & fertility windows
✔ Works for Irregular Cycles – Adjustable cycle length (21-45 days)
How It Works (3 Simple Steps)
- Enter the first day of your last period
- Input your average cycle length (default: 28 days)
- Get instant results for:
- Next period date 📅
- Ovulation days (peak fertility) 🥚
- Fertile window (best conception time) ⏳
- Safe period (low pregnancy chance) 🔒
💡 Pro Tip: Bookmark your results to track changes month-to-month!
Who Should Use This Calculator?
✅ Women trying to conceive – Pinpoint ovulation days accurately
✅ Birth control users – Identify fertile days to avoid
✅ Teens & first-time users – Learn about cycle patterns
✅ PCOS/irregular cycle users – Track variations over time
Understanding Your Results
We explain what each term means:
| Term | Meaning | Why It Matters |
|---|---|---|
| Menstruation | Bleeding phase | Start of new cycle |
| Follicular Phase | Pre-ovulation | Body prepares to release egg |
| Ovulation | Egg release (Day 14-16) | Highest pregnancy chance |
| Luteal Phase | Post-ovulation | PMS symptoms may appear |
FAQs: Period Calculator
How accurate is this calculator?
While 95% accurate for regular cycles, factors like stress, illness or PCOS can affect results. Track 3+ months for best accuracy.
Can I use this to prevent pregnancy?
No – This predicts fertility but isn’t birth control. Always use protection if avoiding pregnancy.
Why are my predicted dates wrong?
Irregular cycles, hormonal changes, or incorrect start date entry can cause variations.
What’s the best time to conceive?
The 5 days before ovulation and day of ovulation itself offer highest conception chances.
Bonus: Natural Cycle Tracking Tips
- Check cervical mucus (egg-white consistency = fertile)
- Track basal body temperature (spike after ovulation)
- Note PMS symptoms (cramps, mood changes predict periods)
- Use ovulation test kits for most accurate results
🔬 For Medical Concerns: Consult a doctor if:
- Cycles are <21 or >35 days regularly
- No period for 90+ days (not pregnant)
- Severe pain/unusual bleeding