Luteal Phase Calculator
Analyze your luteal phase length and identify potential cycle health issues that may affect conception.
Cycle Data Entry
Your Cycles
Cycle 1
Normal Luteal Phase
- • Length: 10-16 days (average 12-14)
- • Consistent within 2-3 days cycle to cycle
- • Allows time for implantation (6-12 DPO)
- • Less than 10 days may affect fertility
Enter your cycle data to analyze luteal phase health
Frequently Asked Questions
What is a normal luteal phase length?
A normal luteal phase typically lasts 10-16 days, with an average of 12-14 days. This phase should be fairly consistent from cycle to cycle, varying by no more than 2-3 days. The luteal phase is controlled by progesterone production from the corpus luteum after ovulation. A luteal phase shorter than 10 days may indicate luteal phase defect (LPD), which can affect implantation and early pregnancy maintenance. Conversely, luteal phases longer than 16 days are uncommon and may indicate pregnancy or hormonal imbalances that warrant medical evaluation.
When should I contact a doctor about short luteal phase?
Contact a healthcare provider if your luteal phase is consistently less than 10 days, especially if you are trying to conceive. Luteal phases under 8 days are particularly concerning and require medical evaluation. Other signs that warrant medical attention include: irregular luteal phase lengths varying by more than 4 days, difficulty conceiving after 6-12 months of trying, recurrent early pregnancy loss, or symptoms like spotting between ovulation and your period. Your doctor may recommend progesterone testing, ultrasounds, or hormone therapy depending on your specific situation and fertility goals.
Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical advice. Luteal phase length is just one aspect of reproductive health, and normal variations exist between individuals. If you have concerns about your cycle, fertility, or reproductive health, especially if you have been trying to conceive without success or have experienced pregnancy loss, please consult with a qualified healthcare provider who can provide personalized evaluation and treatment recommendations based on your complete health history.