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The USCF formula for rating is Ratingnew = Ratingold+ K* (Wins-Expected Wins) + Bonus
where Bonus is 1 pt for each point gained above 16*SQRT(Games). Games is the # of games played in an event.
Much of this is explained in the USCF rating page.
Here is a K chart, assuming 50 or more games played, lifetime:
The columns are number of games played in the tournament, the rows the rating:
3 4
5 6
7 8
9 10
11 12
13 14
400 68.7 63.2
58.6 54.6 51.1 48.0
45.3 42.9 40.7 38.7
36.9 35.3
500 65.9 60.9
56.6 52.8 49.6 46.7
44.1 41.8 39.7 37.8
36.1 34.6
600 63.0 58.4
54.4 51.0 47.9 45.2
42.8 40.6 38.7 36.9
35.3 33.8
700 60.1 55.9
52.2 49.0 46.2 43.7
41.4 39.4 37.5 35.9
34.3 32.9
800 57.1 53.3
49.9 47.0 44.4 42.1
40.0 38.1 36.3 34.8
33.3 32.0
900 54.0 50.6
47.6 44.9 42.5 40.4
38.4 36.7 35.1 33.6
32.2 31.0
1000 50.8 47.8
45.1 42.7 40.5 38.6
36.8 35.2 33.7 32.3
31.1 29.9
1100 47.6 44.9
42.5 40.4 38.4 36.7
35.1 33.6 32.2 31.0
29.8 28.8
1200 44.3 41.9
39.8 38.0 36.2 34.7
33.2 31.9 30.7 29.5
28.5 27.5
1300 40.9 38.9
37.1 35.4 33.9 32.6
31.3 30.1 29.0 28.0
27.1 26.2
1400 37.4 35.7
34.2 32.8 31.5 30.3
29.2 28.2 27.2 26.3
25.5 24.7
1500 33.9 32.5
31.3 30.1 29.0 28.0
27.0 26.2 25.3 24.6
23.8 23.1
1600 30.4 29.3
28.3 27.3 26.4 25.5
24.8 24.0 23.3 22.7
22.0 21.4
1700 26.9 26.0
25.2 24.4 23.7 23.0
22.4 21.8 21.2 20.7
20.1 19.6
1800 23.5 22.9
22.2 21.6 21.0 20.5
20.0 19.5 19.0 18.6
18.2 17.8
1900 20.4 19.9
19.4 18.9 18.5 18.1
17.7 17.3 16.9 16.6
16.2 15.9
2000 17.7 17.3
16.9 16.6 16.2 15.9
15.6 15.3 15.0 14.7
14.5 14.2
2100 15.8 15.5
15.2 14.9 14.6 14.4
14.1 13.9 13.6 13.4
13.2 13.0
2200 15.1 14.8
14.5 14.3 14.0 13.8
13.6 13.3 13.1 12.9
12.7 12.5
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