G999 · Rules and examples
G999 Decimal Bet Returns: Stake, Gross Credit and Net Result
Decimal odds describe a conditional total return per unit staked. They do not promise an outcome. Keeping total credit and net result in separate columns makes the arithmetic much easier to read.
Multiply once, subtract once
For a simple winning back bet, multiply stake by decimal odds to obtain gross return, including the returned stake. Subtract the stake once to obtain net profit before any applicable fees. The source example explains this convention; it does not establish the terms of another platform.
With a hypothetical stake of 12 units at 2.5, gross return is 30 and net profit is 18. Adding the 12 again would incorrectly produce 42. A losing selection in this simplified example returns zero and has a net change of minus 12.
Compare different prices without confusing probability
The same 12 units at 1.75 produce a conditional gross return of 21 and net profit of nine. At 2.5 the conditional amounts are larger, but the arithmetic does not tell you which event will occur.
Changing the stake changes the amount exposed, not the underlying event. Twenty-four units at 1.75 doubles both the possible gross return and the amount lost if the selection fails. This is scaling, not an improvement in the prediction.
Reconcile several selections
Imagine three separate stakes of 12 units. One wins at 2.5 and the other two lose. Total spending is 36, total return is 30 and the overall net result is minus six. A winning ticket can therefore sit inside a losing group.
Write each selection’s event, period, stake, accepted price and settled return on a separate line. Pending selections should remain pending rather than being counted as losses or estimated wins. Do not mix unsettled balances with settled results.
Know the boundary of the formula
This example covers a simple back bet with no adjustment. Commission, voids, partial wins, dead heats, bonuses, each-way bets and cash-out agreements can require different calculations under the actual terms. The displayed odds alone cannot resolve those cases.
The event and settlement period still matter. A half-time selection can have a different result from a full-match selection involving the same teams. Use the exact accepted selection before calculating the return; a nearby score or an old displayed price is not a substitute.
Try the arithmetic
Hypothetical numbers for learning. This does not run a game, accept a bet or predict an outcome.