Commonly referred to effectiveness rates are referenced below:

Fertility Awareness Method

The Fertility Awareness Method  is 99.4% effective when used correctly. P. Frank-Herrmann, et. al. in Human Reproduction

Timing of sexual intercourse in relation to ovulation. Wilcox et al. New England Journal of Medicine 1995; 333:1571-1521.

The four rules of charting for birth control:

Stanford et al. Obstetrics and Gynecology 2002; 100:1333-1341.

Grimes et al. Contraception 2005; 72:85-90.

Frank-Herrman et al. Human Reproduction 2007; 22:1310-1319.

Freundl et al. The European Journal of Contraception and Reproductive Health Care 2010; 15:113–123.

Robinson et al. Current Medical Research and Opinion 2007; 23:301–306.

Bigelow et al. Human Reproduction 2004; 19:889-892.

Pearl Index

The Billings Method has been found to be 99.5 percent effective.
The Billings Ovulation Method® has been subjected to more scientific research than any other method of regulating fertility. It has been independently trialled by the World Health Organisation and other reputable bodies and found to be as successful for avoiding pregnancy as any method of family planning available today. In one of the largest trials of the Billings Ovulation Method®, a 12-month multi-centre study in China, the method-related pregnancy rate was zero. The method-related rate is when couples correctly follow all the instructions for the method of birth control. The use-related pregnancy rate was 0.5%. The use-related rate includes couples who misunderstood or did not comply with all the instructions.

The Terperature Method is said to be 99% effective with perfect use.
Basal body temperature monitoring is 99% effective in the first year of use, if used correctly and consistently. However, the method is less effective if the woman does not monitor her temperature accurately or if she has unprotected sex in the fertile period of the cycle (including during menstrual bleeding). Because many women have difficulty using the method correctly and consistently, about 25% of those who use fertility awareness method (including but not limited to basal body temperature monitoring) become pregnant in the first year of using the method.

Devices & Contraceptives

Daisy is 99.3% accurate with perfect use.
The algorithm used in daysy is based on that used by the devices from Valley Electronics GmbH, which have been validated by over 28 years of use. The core fertility-tracking algorithm was extensively studied in 1997 in Germany. Over a period of more than 2 years, 686 users in Germany Switzerland, and Mexico were questioned about their experiences with the LadyComp and BabyComp devices. The study measured 10601 months and did register 39 unplanned pregnancies. Of those, 6 occurred during a “green” day leading to a method safety pearl-index of 0.7, and 33 occurred during a “red” or yellow “uncertain” day leading to a usage safety pearl-index of 3.8.

Natural Cycles is 99.5% accurate with perfect use.
Fertility awareness-based mobile application for contraception research study found that that 7 women out of 100 got pregnant in 1 year (equivalent to a typical use pearl index of 7.0) when using Natural Cycles. Whereas only 5 women out of 1000 got pregnant in a year due to the algorithm falsely attributing a green day (method failure rate of 0.5)

LadyComp is 99.3% accurate with perfect use.
The fertility computer takes your basal body temperature (BBT) every morning when you wake up with the most advanced temperature sensor (1/100 degrees accurate). It then automatically compares it with its bio-mathematical forecasting software and stored information of all available family planning research in addition to hundreds of thousands of cycles of other women, to accurately determine, analyze and display your individual cycle. This is why the intelligent fertility computer is one of the most effective fertility monitors in the world. It is 99.3% effective right from the start. A Pearl Index of 0.7 means that this 100-percent natural method is 99.3 percent safe and effective.

The Pearl Index for diaphragms is comparable to that of natural rubber latex condoms for males:

Mauck C, Lai JJ, Schwartz J, Weiner D, et al. Diaphragms in clinical trials: is clinician fitting necessary? Contraception 2004; 69:263-266.

Yang CC, Maravilla K, Kilbourne-Brook M, Austin G, et al. Magnetic resonance imaging of SILCS diaphragm:anatomical consideration and corroboration with clinical fit. Contraception 2007; 76: 238-244.

Schwartz J, Ballagh S, Creinin M, et al. SILCS diaphragm: postcoital testing of a new single-size contraceptive device. Contraception 2008; 78:237-244.

FemCap has been proven to be over 92% successful in preventing pregnancy.
In clinical trials, the effective rate of the second generation FemCap (the only FemCap approved by the FDA) has been proven to be over 92% successful in preventing pregnancy. It is estimated that FemCap’s success rate may be up to 98% with proper use (e.g. not forgotten, correct placement, not removed too soon) and with emergency contraception (available over-the-counter without prescription) as a backup.

The birth control pill is 99.7% effective with perfect use. Center of disease control and prevention

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