Ovulation tracking methods compared
| Method | What it tells you | Effort |
|---|---|---|
| Calendar counting | An estimate from cycle length (ovulation ≈ 14 days before the next period) | Very low |
| Ovulation (LH) tests | Predicts ovulation 24–36 hours ahead | Daily tests for about a week |
| Cervical mucus | Fertile-quality mucus signals the most fertile days | Daily checks; takes practice |
| Basal body temperature | Confirms ovulation after it happened (temperature rises) | Daily reading on waking |
| Wearable sensors | Track temperature or other signals overnight to detect the shift | Low once set up; device cost |
| Clinic ultrasound | Watches the follicle grow and release the egg | Clinic visits (fertility care) |
Start with the calendar
If your cycles are regular, counting gives a useful first estimate: find your next period date and count back 14 days. Our Ovulation Calculator does this for the next three cycles, and the Calculating Ovulation guide shows the steps.
Add a prediction: LH tests
Ovulation tests detect the hormone surge that comes just before ovulation, so they tell you the best days for sex in advance. The Ovulation Predictor Kits page shows which day to start for your cycle.
Add a confirmation: temperature
Your resting temperature rises slightly after ovulation and stays higher until your next period. Charting it every morning shows, in hindsight, whether and when you ovulated — valuable for learning your pattern, though too late to time sex in the same cycle.
Where apps fit in
Period and ovulation apps are mostly a convenient place to record your data. Most predict ovulation from past cycle lengths, much like a calendar calculation. Their predictions become more personal when you add LH test results, temperature or mucus observations. When choosing an app, look at what data it uses, whether it explains how predictions are made, and its privacy policy — reproductive health data is sensitive.
When to get help
If your cycles are very irregular, you never get a positive LH test, or you have been trying to conceive for a year (six months if you are 35 or older), talk to a doctor or nurse.