This article explains my star rating system in more detail, as well as why I came up with it and what conversion rates I use for other websites.
7 ★★★★★★
10-point: 10.0
5-star: 5 (★★★★★)
6 ★★★★★★
10-point: 8.5 (9)
5-star: 4.5 (★★★★½)
5 ★★★★★★
10-point: 7.0
5-star: 3.5 (★★★½☆)
4 ★★★★★★
10-point: 5.5 (6)
5-star: 3 (★★★☆☆)
3 ★★★★★★
10-point: 4.0
5-star: 2.5 (★★½☆☆)
2 ★★★★★★
10-point: 2.5 (3)
5-star: 1.5 (★½☆☆☆)
1 ★★★★★★
10-point: 1.0
5-star: 1 (★☆☆☆☆)