Point spread to win chance: reading a +5
A five-point underdog is not a 45% team. How to turn a college football point spread into a win chance using the moneyline, with a real Saturday price.
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You cannot read a win chance off a point spread by itself. A spread says how many points the market thinks separate two teams, and the moneyline says how often it thinks each one wins. To get a chance, read the moneyline on the same game and take 1 divided by the decimal price. On Saturday, South Alabama are roughly five-point underdogs to Louisiana Tech, per AP, and the best moneyline we saw, 2.89 at Pinnacle, implies 34.6%.
Spread and moneyline answer different questions
A spread bet on South Alabama +5 wins if they win, or lose by fewer than five. A moneyline bet wins only if they win. The same team can be close on the spread and still a clear outsider to win. We cover the spread itself in point spread betting explained and the winner market in moneyline bets explained.
Doing the conversion
| Step | South Alabama v Louisiana Tech |
|---|---|
| Spread | South Alabama about +5, per AP |
| Best moneyline seen | 2.89, Pinnacle, 04:30 UTC 29 October |
| Implied chance | 1 / 2.89 = 34.6% |
| Our chance | 52.2% |
| Edge | 52.2% minus 34.6% = +17.6 pts |
The implied chance includes the bookmaker's margin, so the market's true view is a little higher than 34.6%. If you have both sides' prices, divide each implied chance by their total to strip the margin out.
Points do not convert evenly into chance. In American football some margins, such as 3 and 7, come up far more often than others, so a spread moving across one of them matters more than a move elsewhere; see key numbers in American football. That is one more reason to read the moneyline, not do sums on the spread.
What our card says
We make South Alabama 52.2% to win, fair price 1.92, which is far above what the price implies. That is our widest gap of the Saturday slate; the other two calls are in college football Halloween: our three calls.
What this does not tell you
The five-point figure is approximate, from AP's preview, and spreads move during the week. Nothing here tells you whether the spread or the moneyline is the better bet on a given game; it only shows how to compare a price with a chance.
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Common questions
How do you turn a point spread into a win probability?
Not from the spread alone. Read the moneyline on the same game and divide 1 by the decimal price; that is the chance the market gives, including its margin.
What win chance does a five-point underdog have?
It depends on the game. On Saturday, South Alabama are about five-point underdogs to Louisiana Tech and their moneyline of 2.89 implies 34.6%.
Why does BAI8 quote moneylines rather than spreads?
Our cards price who wins. A win chance compares directly with a moneyline price; a spread answers a different question, by how much.