How is this calculated?

A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.

Inter led Serie A after matchday 18 of 2023-24.

With 45 points, they were 2 ahead of Juventus. Nothing was decided mathematically on this matchday.

Results

Date	Home	Score	Away
29 Dec	Fiorentina	1–0	Torino
29 Dec	Napoli	0–0	Monza
29 Dec	Genoa	1–1	Inter
29 Dec	Lazio	3–1	Frosinone
30 Dec	Atalanta	1–0	Lecce
30 Dec	Cagliari	0–0	Empoli
30 Dec	Udinese	3–0	Bologna
30 Dec	Verona	0–1	Salernitana
30 Dec	AC Milan	1–0	Sassuolo
30 Dec	Juventus	1–0	Roma

Table after matchday 18

Pos.	Team	Played	Goal diff.	Points	Max.	Title
1	Inter	18	+34	45	105	In it
2	Juventus	18	+16	43	103	In it
3	AC Milan	18	+12	36	96	In it
4	Fiorentina	18	+9	33	93	In it
5	Bologna	18	+6	31	91	In it
6	Atalanta	18	+9	29	89	In it
7	Roma	18	+10	28	88	In it
8	Napoli	18	+7	28	88	In it
9	Lazio	18	+2	27	87	In it
10	Torino	18	-3	24	84	In it
11	Monza	18	-2	22	82	In it
12	Genoa	18	-4	20	80	In it
13	Lecce	18	-5	20	80	In it
14	Frosinone	18	-8	19	79	In it
15	Udinese	18	-10	17	77	In it
16	Sassuolo	18	-8	16	76	In it
17	Verona	18	-9	14	74	In it
18	Cagliari	18	-15	14	74	In it
19	Empoli	18	-20	13	73	In it
20	Salernitana	18	-21	12	72	In it

Max.: the most points the team can still finish on.

Matchdays

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Quick answers

Who was top of Serie A after matchday 18 of 2023-24?: Inter led Serie A after matchday 18 of 2023-24. With 45 points, they were 2 ahead of Juventus.
What was decided on matchday 18 of the 2023-24 Serie A?: Nothing was decided mathematically on this matchday.
How is this calculated?: A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.