The Chess Performance Rating Calculator tells you how strongly you played at a tournament by turning your opponents’ ratings and your results into a single performance figure. It computes the FIDE rating-difference method and the popular linear approximation so you can compare both.
How it works
A performance rating answers: what rating would justify this score against this field? It always starts from the average opponent rating.
The FIDE table method then adds a rating difference, dp, that depends only on
your score percentage p = score ÷ games:
TPR = average opponent rating + dp(p)
The dp value comes from FIDE’s published table — 0 at 50%, growing to +800 at
100% and −800 at 0%. So a 70% score against 1600-rated opposition performs at
about 1600 + 149 = 1749.
The linear method is a faster estimate:
TPR = average opponent rating + 400 × (wins − losses) ÷ games
It matches the table closely near 50% but exaggerates extreme scores, which is why the FIDE table is preferred for official figures.
Example and notes
Score 3 wins, 1 draw, and 1 loss (a 70% score) against opponents averaging 1630, and the table method reports a performance near 1779 while the linear method lands close by. Make sure you enter exactly one opponent rating per game — the tool checks this and uses the count to compute both your average opposition and your score percentage accurately.