How is a photo's ranking worked out?

A photo’s ranking is calculated based on the proportion of 1, 2 and 3-star ratings that it has achieved.

However, it’s not quite as simple as averaging the number of stars – we’ve built a few tweaks into the scoring algorithm. There are slight variations in users' voting weight based on their voting behaviour, for instance, which will impact results. These tweaks are based on what we’ve learned about patterns of rating over the last few years, and they help ensure that the rankings are as unbiased as possible and the results are a fair representation of the crowd's opinion.