Decision guide
How to Choose a Method
An objective comparison of the major modern NFP and fertility awareness methods, including effectiveness, cost, and best-fit scenarios.
12 min read· Comparison
There is no single best method, the right choice depends on your cycles, lifestyle, life stage, and what kinds of observations you find sustainable.
At a glance
| Method | Perfect use | Typical use | Daily effort |
|---|---|---|---|
| Marquette | 98–99% | 92–98% | Hormone test + entry |
| Sympto-Thermal (Sensiplan) | 99.6% | ~98% | Temp + mucus |
| Billings | 98%+ | 78–95% | Mucus only |
| Creighton | 99% | 85–95% | Standardized mucus |
| Standard Days | 95% | 88% | Calendar tracking |
Effectiveness ranges reflect both the variability across studies and the dependence on quality of instruction.
Questions to ask yourself
- How regular are my cycles?
- Am I currently breastfeeding, postpartum, or perimenopausal?
- Do I prefer objective data (e.g. a hormone monitor) or am I confident with subjective observation?
- Is ongoing cost (test sticks, monitor) acceptable?
- Will I work with a certified instructor?