Kenyan elections are often discussed in terms of voting blocs, regions and who has the biggest following. But when it comes to the presidency, there is a specific constitutional formula that determines whether a candidate wins in the first round. It is commonly referred to as “50% + 1 ”. But what does that actually mean?
Under Article 1 38 of the Constitution of Kenya, a presidential candidate must meet two requirements to be elected in the first round. They must receive more than half of all the votes cast in the presidential election. They must also receive at least 25% of the votes cast in more than half of Kenya’s counties, meaning at least 24 counties. Both conditions have to be satisfied.
Imagine there are three presidential candidates:
- Candidate A: 5 million votes
- Candidate B: 4 million votes
- Candidate C: 1 million votes
That is 1 0 million votes in total. To win the presidency in the first round, Candidate A would need more than 5 million votes. If Candidate A receives exactly 5 million, that is 50%, not more than 50%. Candidate A would therefore need at least 5,000,001 votes.
But there is another hurdle. Candidate A must also have received at least 25% of the presidential votes cast in at least 24 counties. So a candidate could finish first nationally but still fail to meet the constitutional requirements for an outright first-round victory.
The second requirement means that presidential candidates need support that is geographically distributed across the country. A candidate cannot win outright simply by accumulating an enormous number of votes in a relatively small number of counties. For example, a hypothetical candidate could dominate several highly populated counties and finish with the largest national vote total. But if that candidate fails to reach the 25% threshold in at least 24 counties, they would not satisfy the constitutional requirements for a first-round victory. The rule therefore looks at both the size and geographical spread of a candidate’s support.
If no candidate satisfies the constitutional requirements, the election proceeds to a second election, commonly called a runoff. Under Article 1 38, the runoff is held within 30 days. The two candidates who qualify for the second election are determined according to the constitutional rules governing the first election. The second round is then a contest between the qualifying candidates.
Another important part of the mathematics is turnout. The number of registered voters in a county does not itself determine how many votes a candidate receives. What matters in the presidential contest is the votes actually cast.
Imagine County X has 1 million registered voters. If 800,000 people vote, a candidate needs 200,000 votes to reach 25% of the votes cast there. But if only 400,000 people vote, that same candidate needs just 1 00,000 votes. The threshold is therefore based on votes cast, not registered voters. This is one reason turnout is such an important part of understanding Kenyan elections.
The 50% + 1 system creates two different mathematical challenges for presidential candidates. Nationally, they need more than half of the votes cast. Geographically, they need to reach at least 25% in at least 24 counties. A candidate therefore needs to think about both the total number of votes they receive and where those votes come from.
This is why looking only at national vote totals can sometimes give an incomplete picture of how a presidential election works. Two candidates could have very different geographical distributions of support even if their national totals are relatively close.
A candidate can therefore win the presidency without necessarily having the largest single voting bloc in the country. Kenya’s presidential election is not formally decided by which ethnic, regional or political bloc is largest. It is decided by the constitutional thresholds.
A candidate’s support can come from many different parts of the country, and the decisive question is whether that support adds up to the required national majority while also meeting the county distribution requirement.
That is the key to understanding 50% + 1 . It is not simply about who has the biggest base. It is about who can turn their support into more than half of the votes cast nationally, while reaching the required threshold across at least 24 counties.
And that distinction matters every time Kenyans try to understand the mathematics of a presidential election.
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