Betting odds cheatsheet

bet-odds-formats.org

Cheatsheet for converting between different betting odds and calculating implied probability.

American to Decimal

Fav

-110 = 100 / 110 + 1 = 1.909

Dog

+150 = 150 / 100 + 1 = 2.5

American to Fractional

Fav

-110 = 100 / 110 = 10 / 11

Dog

+150 = 150 / 100 = 3 / 2

Decimal to American

Fav (under 2)

1.909 = (-100) / (1.909 - 1) = -110

Dog (over 2)

2.5 = (2.5 - 1) * 100 = +150

American to Implied Probability

Fav

-110 = 110 / (100 + 110) = 0.5238 = 52.38%

Dog

+150 = 100 / (100 + 150) = 0.4 = 40%

Decimal to Implied Probability

Fav

1.909 = 1 / 1.909 = 0.5238 = 52.38%

Dog

2.5 = 1 / 2.5 = 0.4 = 40%

Fractional to Implied Probability

Fav/Dog

10 / 11 = 11 / (10 + 11) = 0.5238 = 52.38%