Billings Method

International Charting Symbols


Personal Records

In charting the cervical mucus symptom of the Billings Method, the use of a graphical record is particularly valuable because this provides a large amount of information which can be taken in at a glance, embodying perhaps the obsverations made over several months.

There are three visual recording methods in use. The most recent development is a BAR CHART that has been designed to exploit computer displays and printers. It is the simplest and it is the most intuitive.

The other methods use coded coloured stamps (stickers) and black and white graphical symbols. While the coloured stamps provide a more emphatic visual model, a record based on graphical symbols can be kept with only pencil and paper.

All methods convey the essentail details across barriers of language, and provide for comprehension even by the illiterate.

The legend for the stamps and symbols of the Billings Method are given in the following tables.


International Symbols


Symptom Description

Bleeding or spotting Dry Mucus

Change from the Basic Infertile Pattern (BIP)

The Peak of the mucus symptom

The peak of fertility


International Symbols I



Symptom Description

Changed mucus for 3 days after Peak

No longer slippery
or luberactive

Dry for 3 days after Peak Mucus and infertility

1. BIP of unchanging discharge before Peak

2. From the fourth day past the Peak



The following is an example chart of a normal fertile cycle showing both a stamp record and an international symbol record.


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

Infertile Unchanging pattern Basic Infertile Pattern (BIP)

Possibly fertile
Changing pattern progressively becoming slippery up to the Peak

Egg is dead


Billings Method

Billings Method Natural Family Planning INDEX email address