Methods
Five methods, clearly explained.
Each modern method reads a different combination of biological signals. Here's how they compare.
Before choosing a method
Before comparing method names, it helps to understand how NFP works, what fertility signs are being observed, and why instruction can matter. These guides explain the basics before you look at individual methods.
- How NFP WorksFertility signs, method rules, and the fertile window in practice.
- How to Compare Modern MethodsA careful, non-ranked look at what each method observes.
- What Is Natural Family Planning?A plain-English definition of the category.
- Which method should I start with?Things to weigh before committing to a method.
- Do I need a certified instructor?When structured instruction tends to matter most.
- How effective is NFP?How to read effectiveness numbers honestly.
Marquette
9 MIN READ
The Marquette Method
A natural family planning method that combines an at-home urinary hormone monitor with method-specific protocols. Often discussed in postpartum and breastfeeding contexts because hormone signals can help when other fertility signs are harder to read.
- Perfect use
- 98%
- Typical use
- 93%
- Biomarkers
- Urinary hormones (LH, estrogen) · Optional cervical mucus · Optional BBT
Billings
8 MIN READ
The Billings Ovulation Method
A fertility awareness based method that identifies the fertile window through standardized cervical mucus observations and sensation, without temperature charting or hormone monitors.
- Perfect use
- 97%
- Typical use
- 78 to 88%
- Biomarkers
- Cervical mucus sensation and appearance
Creighton
8 MIN READ
The Creighton Model FertilityCare System
A standardized cervical mucus charting system taught one-on-one by trained instructors. Creighton uses a defined vocabulary and stamp system so observations can be compared consistently between users and across time.
- Perfect use
- 99.5%
- Typical use
- 96.8%
- Biomarkers
- Standardized cervical mucus observation and charting
Sympto-Thermal
9 MIN READ
Sympto-Thermal Method
A category of fertility awareness based methods that combine more than one fertility sign, usually basal body temperature and cervical mucus. Different programs follow different rules; the German Sensiplan protocol is one of the most rigorously studied.
- Perfect use
- 99.6%
- Typical use
- 98.2%
- Biomarkers
- Basal body temperature · Cervical mucus · Optional cervix observations
Standard Days
7 MIN READ
Standard Days Method
A calendar-based fertility awareness method designed for people whose cycles consistently fall within a specific range of cycle lengths. It is simpler than biomarker-based methods, but it applies to a narrower set of users.
- Perfect use
- 95%
- Typical use
- 88%
- Biomarkers
- Cycle length
FEMM
7 MIN READ
FEMM
FEMM (Fertility Education and Medical Management) is a program that combines fertility charting education with attention to reproductive health, taught by trained teachers and supported by an app, with optional urinary LH testing.
- Perfect use
- Limited published data
- Typical use
- Limited published data
- Biomarkers
- Cervical fluid observation · Bleeding patterns · Optional urinary LH testing