Decimal, Fractional and Moneyline Odds

Odds are a pricing language. They tell you how a bookmaker will settle a successful selection relative to your stake. They do not reveal a guaranteed result, and converting between formats never creates an edge on its own. Australian apps lean on decimal odds, racing cards still lean on fractions, and some international feeds show American moneyline figures.

Format	Example	What it shows
Decimal	2.50	Total return including stake per 1 unit
Fractional	6/4	Profit relative to stake
Moneyline	+150	Profit on 100 units (positive favourite/underdog style)

Decimal odds in Australian apps

Decimal prices are usually the default on local sportsbooks. A price of 3.00 means a one-unit stake returns three units in total if the selection is successful (two units of profit plus the original stake). To estimate implied probability from a decimal, divide one by the price — remembering that bookmaker margins mean market prices across all outcomes will not add to a perfectly fair book.

When you switch an app from decimal to fractional display, the underlying market has not changed. You are only changing how the same settlement is presented. That is useful if you grew up reading race books in fractions, but it is not a signal about form or value.

Fractional and moneyline

Fractional odds such as 5/2 describe profit relative to stake: a two-unit stake at 5/2 returns five units of profit plus the stake back if successful. Moneyline quotes use plus and minus figures around a 100-unit baseline. Positive moneyline shows potential profit on 100 units; negative moneyline shows how much you must stake to return 100 units of profit. Conversions are arithmetic, not predictions.