Odds Desk

How a line is written and what it implies. Explanatory reference — no operator is named or recommended.

Odds formats
Implied probability
Match formats
Archive

Reference

Odds converter

Decimal odds

1.85Decimal

17/20Fractional

-118American

54.1%Implied

Arithmetic only: implied probability is 1 divided by the decimal price. Across a two-way market the implied probabilities add up to more than 100% — the excess is the margin. Explanatory; betting carries risk.

Read the line first

FormatsDecimal, fractional and American are the same number written three ways.
Implied1 divided by the decimal price is the probability the price implies.
MarginImplied probabilities in a market sum above 100%. That excess is the margin.
FormatA best-of-one has no handicap market; a best-of-three does.