850exp(rank0.032)
Because people seem interested in this formula, I made a table of how all the ranks translate to ratings:
30k 850.0
29k 877.6
28k 906.2
27k 935.6
26k 966.1
25k 997.5
24k 1029.9
23k 1063.4
22k 1098.0
21k 1133.7
20k 1170.6
19k 1208.6
18k 1247.9
17k 1288.5
16k 1330.4
15k 1373.7
14k 1418.3
13k 1464.4
12k 1512.1
11k 1561.2
10k 1612.0
9k 1664.4
8k 1718.6
7k 1774.4
6k 1832.1
5k 1891.7
4k 1953.2
3k 2016.7
2k 2082.3
1k 2150.0
1d 2219.9
2d 2292.1
3d 2366.7
4d 2443.6
5d 2523.1
6d 2605.1
7d 2689.8
8d 2777.3
9d 2867.6
10d 2960.9