PRESIDENTIAL ELECTION
Eight candidates are vying to become the fourth leader to replace President Mwai Kibaki, who is stepping down after two terms in power.
To win, candidates must win an absolute majority of 50 percent plus one vote, and take at least 25% of votes in 24 of 47 counties. If not, the top two proceed to a second round run off within 30 days after any appeals.
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PARLIAMENTARY ELECTION
Kenya's lower house will have 350 seats, with 290 directly elected Members of Parliament, a steep increase from the 222 in the previous parliament.
In addition, voters will also choose from a women's list to elect 47 women, one from each county. A further 12 positions are nominated by political parties to represent special groups such as youth, people with disabilities and unions.
Lawmakers will vote for a Speaker.
All polls - except for the presidency -are first-past-the-post elections.
SENATE ELECTION
A total of 68 senators will make up the upper house, including 47 elected to represent Kenya's 47 counties, with the remaining members nominated by political parties to represent women, youth and people with disabilities.
GUBERNATORIAL ELECTION
In new and powerful positions brought in by Kenya's 2010 constitution, governors head the executive in charge of Kenya's 47 counties.
COUNTY ASSEMBLY
Kenyans will also vote for county councillors.
