The .5 in betting means half a point. It sits on lines and totals, such as Team A -6.5 or over 160.5 points, and because no game ends with half a point, the result can never land exactly on the number. Every bet at a .5 has a winning and a losing side, and none ends in a push, the refund a whole-number line can produce.
That half point decides close games: at -6.5, a 7-point win pays and a 6-point win loses. NSW's Bookmaker Declared Betting Events Betting Rules make half a point the default start unless the bookmaker and customer agree otherwise (clause 5.1.3).
Settling a -6.5 line on four AFL scores
For the bet, Team A at -6.5 has 6.5 points taken off its score, so only a winning margin of 7 or more pays. Team B at +6.5 has 6.5 added, so it is paid on a win, a draw or a loss by up to 6. In the AFL a goal is worth 6 points, so -6.5 asks the favourite to win by more than a goal.
With illustrative prices, $30 on each side:
| Final score | Margin | Team A -6.5 at $1.95 | Team B +6.5 at $1.89 |
|---|---|---|---|
| 88 to 80 | Team A by 8 | Wins: $58.50 | Loses |
| 81 to 74 | Team A by 7 | Wins: $58.50 | Loses |
| 80 to 74 | Team A by 6 | Loses | Wins: $56.70 |
| 70 to 78 | Team B by 8 | Loses | Wins: $56.70 |
Return = stake x price: $30 x 1.95 = $58.50 and $30 x 1.89 = $56.70. In the 80 to 74 game, Team A's adjusted score is 80 - 6.5 = 73.5, which trails 74. Totals and player markets work the same way: over 160.5 points needs 161, over 2.5 goals needs 3 and over 24.5 disposals needs 25, as over under betting shows.
Half points, whole numbers and pushes
A whole-number line has three possible results instead of two:
| Team A's margin | Team A -6.5 | Team A -6 | Team A -7 |
|---|---|---|---|
| 8 or more | Wins | Wins | Wins |
| Exactly 7 | Wins | Wins | Push |
| Exactly 6 | Loses | Push | Loses |
| Under 6, a draw or a loss | Loses | Loses | Loses |
A push happens when the result lands exactly on the number, and the usual rule type refunds the stake. The line betting guide explains how the start is set.
When paying for the half point is worth it
Moving a line your way, from -6.5 to -6 or -5.5, is sold in Australia as pick your own line or alternate lines (buying points, in US terms), and the price shortens as you move.
The move changes the result on one margin only, the number you cross: an exact 6 refunds at -6 and wins at -5.5, while every other winning margin pays the shorter price. AFL margins spread widely, so assume, for illustration, that Team A wins by 7 or more 49% of the time and by exactly 6 just 1.1% of the time:
| Line | Stake back on | Price | Average return per $100 |
|---|---|---|---|
| -6.5 | Nothing | $1.95 | 0.49 x 1.95 x $100 = $95.55 |
| -6 | Exactly 6 | $1.88 | 0.49 x 1.88 x $100 + 0.011 x $100 = $93.22 |
| -5.5 | Nothing: 6 wins | $1.84 | 0.501 x 1.84 x $100 = $92.18 |
The half point to -6 pays for itself only if an exact 6 is more likely than 0.49 x 1.95 - 0.49 x 1.88 = 0.034, or 3.4%. The full point to -5.5 needs more than 0.49 x 1.95 / 1.84 - 0.49 = 0.029, about 2.9%. At the assumed 1.1%, neither buy pays. In rugby league, where scores come in 4s, 2s and 1s, the same half point can be worth far more, as NRL line betting measures.
Risk: Betting involves risk. A bought point that clears its break-even can still lose, and the margin chances behind it are estimates. See responsible gambling for limits and support.
Comparing half-point lines across bookmakers
Compare the number before the price: an illustrative $2.05 at -7.5 does not beat $1.95 at -6.5, because a 7-point win pays one and loses the other.
B337's Terminal shows prices from 40+ bookmakers across racing and sports. On a game, each bookmaker's line, total and head to head prices sit in their own column, and the sports betting hub covers those markets. Prices are read on a repeating cycle, so confirm the number with your bookmaker. A free account opens a limited view of the Terminal with live odds.
Risk: Betting involves risk. A half point decides which side of a close margin wins, not how likely your side is to win. See responsible gambling for limits and support.