Add up your twenty winner odds, then divide by 20 to give you your average decimal odds.
Then divide those 20 winning races by the total number of races, this will give you your strike rate.
Then convert your average decimal odds into a percentage chance. hopefully your strike rate and percentage are close.


Generally the divisor is 6 or if you want a less agressive divisor make it around 12

1.2 x 5 = 6
2.5 x 4 =6
3 x 2 = 6
3.5 x 2 = 7
1.10 x 10 = 12
etc