Period Calculator (30-Day Cycle, 7-Day Period)
Calculate your next period and ovulation dates with a 30-day cycle length and 7-day period duration. Free online menstrual cycle calculator.
Next 6 Cycles
| Period Days | Ovulation Window |
|---|---|
| Apr 14 – Apr 20 | Apr 30 – May 4 |
| May 14 – May 20 | May 30 – Jun 3 |
| Jun 13 – Jun 19 | Jun 29 – Jul 3 |
| Jul 13 – Jul 19 | Jul 29 – Aug 2 |
| Aug 12 – Aug 18 | Aug 28 – Sep 1 |
| Sep 11 – Sep 17 | Sep 27 – Oct 1 |
Cycle Information
Your average cycle length: 30 days
Period duration: 7 days
Fertility window: Typically 5 days before ovulation
Understanding Your 30-Day Cycle
A 30-day menstrual cycle with a 7-day period duration is longer than average. Understanding your cycle can help with family planning and tracking your reproductive health.
Cycle Phases
- Menstrual Phase: 7 days
- Follicular Phase: ~13 days
- Ovulation Phase: ~24-36 hours
- Luteal Phase: ~14 days
Key Days in Your Cycle
- Period Start: Day 1
- Fertile Window: Days 12-17
- Ovulation: Day 16
- Next Period: Day 30
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About this Calculator
Calculate your next period and ovulation dates with a 30-day cycle length and 7-day period duration. Free online menstrual cycle calculator.
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