The estimated lifetime risk of being diagnosed with ovarian cancer is 1 in 50 (2%) for females born after 1960 in the UK.[1]
These figures take account of the possibility that someone can have more than one diagnosis of ovarian cancer in their lifetime (‘Adjusted for Multiple Primaries’ (AMP) method).[2]

See also
Lifetime risk for all cancers combined and cancers compared
Ovarian cancer incidence statistics
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References
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Lifetime risk estimates calculated by the Statistical Information Team at Cancer Research UK. Based on Office for National Statistics (ONS) 2016-based Life expectancies and population projections. Accessed December 2017, and Smittenaar CR, Petersen KA, Stewart K, Moitt N. Cancer Incidence and Mortality Projections in the UK Until 2035. Brit J Cancer 2016.
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Sasieni PD, Shelton J, Ormiston-Smith N, et al. What is the lifetime risk of developing cancer?: The effect of adjusting for multiple primaries. Br J Cancer, 2011. 105(3): p. 460-5.
About this data
Data is for UK, past and projected cancer incidence and mortality and all-cause mortality rates for those born in 1961, ICD-10 C56-C57.4.
The calculations used past and projected cancer incidence and mortality and all-cause mortality rates for those born in 1961 to project risk over the lifetime of those born in 1961 (cohort method).[1] Projections are based on observed incidence and mortality rates and therefore implicitly include changes in cancer risk factors, diagnosis and treatment.