Rates of Unintended Pregnancies per 100 Women

Key

0–0.9
Very effective
 
1–9
Effective
 
10–19
Moderately effective
 
20+
Less effective
  First-Year Pregnancy Ratesa (Trussell & Aikenb) 12-month Pregnancy Ratesc (Cleland & Alid)
Family planning method Consistent and correct use As commonly used As commonly used
Implants 0.1 0.1 0.6
Vasectomy 0.1 0.15  
Female sterilization 0.5 0.5  
Levonorgestrel IUD 0.5 0.7  
Copper-bearing IUD 0.6 0.8 1.4
LAM (for 6 months) 0.9e 2e  
Monthly injectables 0.05e 3e  
Progestin-only injectables 0.2 4 1.7
Combined oral contraceptives 0.3 7 5.5
Progestin-only oral pills 0.3 7  
Combined patch 0.3 7  
Combined vaginal ring 0.3 7  
Male condoms 2 13 5.4
Standard Days Method 5 12  
TwoDay Method 4 14  
Ovulation Method 3 23  
Other fertility awareness methods   15  
Diaphragms with spermicide 16 17  
Withdrawal 4 20 13.4
Female Condoms 5 21  
Spermicide 16 21  
Cervical cap 26g, 9h 32g,16h  
No method 85 85  

a Rates largely from the United States. Data from best available source as determined by authors.

b Trussell J and Aiken ARA, Contraceptive ef cacy. In: Hatcher RA et al. Contraceptive Technology, 21st revised edition. New York, Ardent Media, 2018.

c Rates from developing countries. Data from self-reports in population-based surveys.

d Polis CB et al. Contraceptive failure rates in the developing world: an analysis of Demographic and Health Survey data in 43 countries. New York: Guttmacher Institute, 2016.

e Source: Hatcher R et al. Contraceptive technology. 20th ed. New York, Ardent Media, 2011.

f Source:Trussell J. Contraceptive failure in the United States. Contraception. 2004:70(2): 89–96.

g Pregnancy rate for women who have given birth

h Pregnancy rate for women who have never given birth