NBA odds in Australia come in three main markets: head to head (who wins), line (who wins once one team gets a points start) and totals (whether both teams combined score over or under a number). Australian bookmakers show all three in decimal odds, so a price of $1.90 means a $10 bet returns $19 including your stake. US websites write the same markets as "moneyline", "spread" and "over/under", with prices like -110, which is about $1.91 in decimal.
That covers the basics. The rest of this guide shows how to read each market on an NBA board, how to work out how much margin the bookmaker has built in, and why NBA prices move as much as they do. Every number below is invented to show the maths. None of it is a tip.
When the 2026-27 NBA season starts
The regular season tips off on Tuesday 20 October 2026 in the US, with Celtics at Pistons, 76ers at Knicks and Thunder at Spurs on opening night, according to the NBA's schedule announcement. In eastern Australia that is Wednesday morning.
Key dates from NBA.com's 2026-27 calendar:
| Date (US) | What happens |
|---|---|
| 20 October 2026 | Regular season starts |
| 30 October 2026 | NBA Cup group play starts |
| 11 December 2026 | NBA Cup final |
| 19 to 21 February 2027 | All-Star weekend |
| 11 April 2027 | Last day of the regular season |
| 17 April 2027 | Playoffs start |
Teams play 80 games on the base schedule, with two more added after NBA Cup group play to make 82, per NBA.com's schedule notes. That is a lot of markets, most of them posted overnight Australian time.
Head to head: who wins the game
Head to head is the simplest NBA market. You pick the team that wins, overtime and all. There is no draw in basketball: a tied game goes to overtime until someone wins.
Say a board shows:
| Team | Head to head |
|---|---|
| Home team | $1.40 |
| Away team | $3.00 |
A $10 bet on the home team returns $14 if it wins. A $10 bet on the away team returns $30.
The catch with head to head on a big favourite is that the price can be so short the bet tells you little. That is why most NBA betting talk happens on the line.
Line: winning with a points start
The line (the "spread" in US terms) gives the weaker team a head start so both sides are priced close to even. Our guide to point spread betting covers the idea across all sports. Here is how it reads on an NBA board:
| Team | Line | Price |
|---|---|---|
| Home team | -6.5 | $1.90 |
| Away team | +6.5 | $1.90 |
- Home -6.5 wins if the home team wins by 7 or more.
- Away +6.5 wins if the away team wins outright, or loses by 6 or fewer.
The half point is there so the bet can't land exactly on the number. If a line is a whole number, say -6, and the favourite wins by exactly 6, the result is a push. How pushes and overtime are settled is set by each bookmaker's market rules, not the league, so check them before you bet.
You will also see alternate lines: the same game at -2.5, -9.5, -12.5 and so on, each at a different price. They are the same market moved along a scale, so the further the line, the longer the price.
Totals: over or under the combined score
Totals ask one question: will both teams together score more or fewer points than the number? It doesn't matter who wins. The over/under betting guide explains it for every sport. An NBA total looks like this:
| Market | Price |
|---|---|
| Over 224.5 points | $1.87 |
| Under 224.5 points | $1.95 |
If the final score is 115 to 112, that is 227 points and the over wins. If it is 108 to 110, that is 218 and the under wins.
Team totals and quarter or half totals work the same way, just with a smaller number and a smaller slice of the game. Player props (points, rebounds, assists, threes) are totals for one player. Our post on NBA player prop hit rates covers why a player clearing a line in 7 of their last 10 games tells you less than it seems.
Converting US odds to decimal
Most NBA coverage online is American, so you will see prices like -110 or +150. To convert:
- Negative American odds: decimal = 1 + (100 ÷ the number). So -110 is 1 + 100/110 = $1.91, and -180 is $1.56.
- Positive American odds: decimal = 1 + (the number ÷ 100). So +150 is $2.50.
BetBank's odds calculators do this for you, and also show the implied probability of each price.
How to find the margin on an NBA market
Every price has a probability inside it: 1 divided by the decimal odds. Add up the probabilities on every side of a market and the total goes over 100%. The amount over 100% is the bookmaker's margin, also called the vig or overround. What is vig goes into it in more depth.
Using the three invented markets above:
| Market | Prices | Implied probabilities | Total | Margin |
|---|---|---|---|---|
| Line ±6.5 | $1.90 / $1.90 | 52.63% + 52.63% | 105.26% | 5.26% |
| Head to head | $1.40 / $3.00 | 71.43% + 33.33% | 104.76% | 4.76% |
| Total 224.5 | $1.87 / $1.95 | 53.48% + 51.28% | 104.76% | 4.76% |
Removing the margin to get fair odds
To get a rough fair price, divide each side's implied probability by the market total, then turn it back into odds. For the head to head market:
- Home: 71.43% ÷ 104.76% = 68.18%, so fair odds are 1 ÷ 0.6818 = $1.47.
- Away: 33.33% ÷ 104.76% = 31.82%, so fair odds are $3.14.
For the total, the same steps give a fair over of about $1.96 and a fair under of about $2.04.
This is the simplest method, and it spreads the margin evenly across both sides. In practice bookmakers often load more margin onto the longer price, so treat the result as an estimate. It is also only as good as the market you started with: one bookmaker's prices give you one opinion. Comparing the same game across many bookmakers on an odds screen gives a better read of where the fair price sits.
Why this matters
Once you have a fair price, you can compare it with the prices you can actually take. If the fair under is about $2.04 and a bookmaker has $2.10, the expected value of that bet is about 0.4895 × 2.10 minus 1 = +2.8%. That is a long-run average across many similar bets, not a promise about this one. A positive expected value bet still loses often, and the Positive EV tool is built around exactly this comparison across bookmakers.
Why NBA lines move
NBA prices move more than most sports, and the main reason is simple: there are only five players on court, so one player matters a lot.
The injury report
The NBA requires teams to file a participation status for any player whose availability may be affected by 5 p.m. local time the day before a game, according to the league's injury report rules. For the second game of a back-to-back the deadline is 1 p.m. local time on game day. Teams also file a game-day report between 11 a.m. and 1 p.m. local time (8 to 10 a.m. for tip-offs at 5 p.m. or earlier), and the report is updated through the day.
In Australian terms, for a 7 p.m. tip-off on the US east coast, that game-day report lands in the early hours of the morning here, a few hours before the game starts mid-morning. That is when many NBA lines take their biggest jump.
An invented example: a home team sits at -6.5 overnight. The game-day report lists its best player as out, and within minutes the line is -3.5. Anyone who took +6.5 before the news holds a better number than the market now shows. That gap between the price you took and where the market finishes is closing line value.
Rest days and back-to-backs
Teams average 14.2 back-to-backs each in 2026-27, and no team plays more than 16, per NBA.com's schedule notes. The second night of a back-to-back is when tired legs and rest decisions come into play.
The NBA's Player Participation Policy limits how much stars can be rested. Under it, a star is a player who has been an All-Star or All-NBA in any of the previous three seasons, no more than one star should be unavailable for the same game, and stars must be available for national TV and NBA Cup games, as ESPN explains. Older players and those with heavy career workloads can get pre-approved back-to-back rest. Knowing those rules helps you read why one star's status is uncertain and another's isn't.
Price differences between bookmakers
Not every bookmaker moves at the same moment. After big news, some update in seconds and others lag. That is why the same line can show $1.90 at one bookmaker and $2.00 at another for a short time. Checking several prices before you bet, known as line shopping, is the most practical habit an NBA bettor can build.
A quick checklist for reading an NBA board
- Know the market: head to head, line, total, or a player or team prop.
- Convert if needed: turn any American prices into decimal.
- Work out the margin: add the implied probabilities. The lower the total, the less you pay for the bet. Compare the same market across bookmakers rather than judging one on its own.
- Check the news: has the injury report been filed, and is either team on a back-to-back?
- Compare bookmakers: the best price on the same line can differ by several cents.
- Set a limit first: decide your stake before you look, and stick to it.
Follow the NBA board in one place
BetBank compares NBA prices across Australian bookmakers on its odds screen and does the margin maths for you. For the new season, first-time members on a weekly or monthly plan get half price for their first 2 months, until 30 November 2026. See how the NBA season special works.
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