The YKS score is not found with a single formula. First your nets in the tests, then the conversion of those nets to a score. You can see the steps in order below.
1. Find the nets
In each test, net = correct − wrong ÷ 4. Blanks do not affect the net. The Turkish, Social, Basic Mathematics and Science tests each give a separate net.
2. Check the threshold
For your score to be calculated you must have at least 0.5 net in the relevant tests. For TYT this is needed from Turkish or Basic Mathematics, and for the AYT score types from at least one of the relevant tests. If you do not pass the threshold, that score type is not calculated.
3. Raw score
Each test's net is multiplied by that year's coefficient and the total is added to a fixed score. In TYT, Turkish and Basic Mathematics are weighted 33% each and Social and Science 17% each. In the SAY, EA, SÖZ and DİL scores, TYT and AYT nets are used together.
4. OBP and placement score
Your diploma grade is multiplied by 5 to become the secondary education achievement score (OBP). OBP is multiplied by 0.12 and added to the raw score; this total is the placement score. If you were placed in a program the previous year, this coefficient is halved.
Why an estimate?
ÖSYM does not publish the coefficients in advance and standardizes the score according to the distribution of the test takers. So calculations made before the exam are estimates; the official score is only on the result document.
You can use the calculator to enter your nets and see your estimated score and ranking.