Vega will calculate FIDE-style performance ratings, which are useful for working out IM or GM norms. For other purposes, the true performance rating – the rating at which a player's expected score equals their actual score – is what's wanted. Copy-paste a Vega cross table from a Swiss or round-robin tournament into the text area below, and click 'Calculate' to add a column with the performance rating to the cross table.

The "R" in "Rtg" or the "E" in "Elo" must align with the thousands digit of the ratings.

Replace zero ratings by:
or Iterate until convergence
Calculate
(When using the iteration option, games against unrated players with all wins or all losses will not contribute to a player's TPR.)