Elo expected score

Your Elo

Opponent's Elo

Your expected score 50.00%

0 Elo difference

Expected score counts a win as 1, a draw as ½, and a loss as 0.

Rating difference lookup

Your Elo minus your opponent’s. A positive difference favours you.

Table intervals

50 Elo points 5% expected score

-50 to -800 Elo · 50-point intervals
Elo difference	Expected score
-50	42.9%
-100	36.0%
-150	29.7%
-200	24.0%
-250	19.2%
-300	15.1%
-350	11.8%
-400	9.1%
-450	7.0%
-500	5.3%
-550	4.0%
-600	3.1%
-650	2.3%
-700	1.7%
-750	1.3%
-800	1.0%

+50 to +800 Elo · 50-point intervals
Elo difference	Expected score
+50	57.1%
+100	64.0%
+150	70.3%
+200	76.0%
+250	80.8%
+300	84.9%
+350	88.2%
+400	90.9%
+450	93.0%
+500	94.7%
+550	96.0%
+600	96.9%
+650	97.7%
+700	98.3%
+750	98.7%
+800	99.0%

45% to 0% · 5% intervals
Expected score	Elo difference
45%	-34.9
40%	-70.4
35%	-107.5
30%	-147.2
25%	-190.8
20%	-240.8
15%	-301.3
10%	-381.7
5%	-511.5
0%	−∞

55% to 100% · 5% intervals
Expected score	Elo difference
55%	+34.9
60%	+70.4
65%	+107.5
70%	+147.2
75%	+190.8
80%	+240.8
85%	+301.3
90%	+381.7
95%	+511.5
100%	+∞

Exactly 0% or 100% requires an infinite rating difference.

0 Elo difference = 50% expected score

Uses the continuous Elo formula: E = 1 / (1 + 10^{−difference / 400}).