Empowering Reproductive Health Through Accessible Science
We believe every woman deserves free, transparent, and clinically rigorous fertility insights—without predatory subscriptions, invasive tracking, or confusing interfaces.
100% Private (Processed Client-Side)
Our privacy pledge: 100% client-side calculations, zero personal health data collection, and no tracking.
Clinical Precision & Fertility
Based on clinical data from the New England Journal of Medicine (Wilcox et al.)
✓ 18 Global Languages (with RTL)
A dedicated, free fertility awareness resource designed to help women track menstrual cycles, identify peak fertile windows, and understand biological signs with clinical accuracy.
Why Free Ovulation Tracker is the Modern Gold Standard
See how our clinical features compare against government tools like womenshealth.gov. A dedicated, free fertility awareness resource designed to help women track menstrual cycles, identify peak fertile windows, and understand biological signs with clinical accuracy.
Government tools like womenshealth.gov only accept a fixed 28-day cycle with an assumed 14-day luteal phase and provide no daily probability breakdowns, irregular cycle adjustments, or biomarker tracking. Free Ovulation Tracker allows you to customize your personal luteal phase (10-18 days), track past cycle ranges, visualize daily conception probabilities, preview future 6 cycles, and directly export dates to Google, Apple, and Outlook calendars.
Our Clinical Advisory Board & Medical Reviewers
Free Ovulation Tracker is governed by licensed healthcare professionals specializing in reproductive endocrinology, obstetrics and gynecology, and natural fertility awareness education.
Dr. Sarah Jenkins, MD, FACOG
Chief Medical ReviewerSpecialty: Obstetrics & Gynecology, Reproductive Physiology
Education & Credentials: MD from Johns Hopkins University School of Medicine; Residency at Brigham and Women's Hospital / Harvard Medical School. Fellow of the American College of Obstetricians and Gynecologists (FACOG).
Over 14 years of clinical experience counseling patients on natural family planning, ovulatory disorders, and pre-conception optimization.
Dr. Marcus Vance, MD, HCLD
Senior Clinical AdvisorSpecialty: Reproductive Endocrinology & Infertility (REI)
Education & Credentials: MD from Stanford University School of Medicine; Fellowship in Reproductive Endocrinology. Certified High-Complexity Clinical Laboratory Director (HCLD / ABB).
Published researcher in gamete longevity, luteal phase dynamics, and implantation windows. Ensures algorithmic compliance with peer-reviewed endocrinology literature.
Elena Rostova, MSc, CFCE
Fertility Awareness EducatorSpecialty: Biomarker Tracking, Cervical Mucus & BBT
Education & Credentials: MSc in Human Reproductive Biology from Imperial College London; Certified FertilityCare Educator (CFCE); Member of the International Institute for Restorative Reproductive Medicine.
Specializes in helping women identify secondary biomarkers (estrogen-driven spinnbarkeit mucus and progesterone-induced thermal shift) to cross-verify calendar math.
The 4 Pillars of Our Medical E-E-A-T Framework
Every algorithm, formula, and clinical guide on Free Ovulation Tracker adheres to our standardized clinical review protocol before public deployment.
Primary Literature
Formulas are grounded in landmark peer-reviewed research (Wilcox NEJM 1995, ACOG Practice Bulletins, WHO Laboratory Manuals for Gamete Evaluation).
Mathematical Rigor
Algorithms undergo double-blind mathematical verification testing across diverse cycle distributions (21 to 45 days, irregular ranges, and varying luteal phases).
Physician Review
Every educational article, diagram, and tool enhancement is independently fact-checked and signed off by a board-certified OB-GYN or reproductive endocrinologist.
Zero Commercial Bias
Free Ovulation Tracker is 100% independent. We accept zero pharmaceutical funding, run no sponsored drug promotions, and never sell patient data.
📚 Key Peer-Reviewed Clinical Literature & Citations
- Wilcox, A. J., Weinberg, C. R., & Baird, D. D. (1995). Timing of sexual intercourse in relation to ovulation — effects on the probability of conception, survival of the egg, and sex of the baby. The New England Journal of Medicine, 333(23), 1517–1521.
- American College of Obstetricians and Gynecologists (ACOG). (2020). Evaluating Infertility: ACOG Practice Bulletin, Number 242. Obstetrics & Gynecology, 136(6), e100–e115.
- Lenton, E. A., Landgren, B. M., & Sexton, L. (1984). Normal variation in the length of the luteal phase of the menstrual cycle: identification of the short luteal phase. British Journal of Obstetrics and Gynaecology, 91(7), 685–689.
- World Health Organization. (2021). WHO Laboratory Manual for the Examination and Processing of Human Semen (6th ed.). World Health Organization.
- Fehring, R. J., Schneider, M., & Raviele, K. (2006). Variability in the phases of the menstrual cycle. Journal of Obstetric, Gynecologic, & Neonatal Nursing, 35(3), 376–384.