Point Spreads, Moneylines and Totals Explained
What -3.5, +150 and O/U 47.5 actually mean, how to turn a price into a probability, and how to read the against-the-spread records on 4Football.
You do not need to bet to find betting lines useful. A point spread is the market's best single-number estimate of how much better one team is than another on a given day — often a sharper preview than any column. This guide explains the three numbers you will see on our odds page and on every game page.
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The point spread
Buffalo −5.5 means Buffalo is favoured by five and a half points. A bet on Buffalo wins only if they win by six or more; a bet on the underdog at +5.5 wins if they win outright or lose by five or fewer.
- The half point exists so there cannot be a tie. With a whole-number spread (say −3) and a three-point final margin, the bet is a push and stakes are returned.
- PK or "pick 'em" means no favourite: just pick the winner.
- Because so many NFL games end with margins of 3 and 7, a move from −2.5 to −3.5 is a much bigger deal than a move from −4.5 to −5.5. Those are called key numbers.
The moneyline
The moneyline ignores the margin — you are betting on who wins. Prices are quoted in American odds:
- −150: risk $150 to win $100 (the favourite)
- +130: risk $100 to win $130 (the underdog)
Turning a price into a probability
- Negative odds:
odds / (odds + 100), ignoring the minus sign. So −150 → 150 / 250 = 60%. - Positive odds:
100 / (odds + 100). So +130 → 100 / 230 = 43.5%.
Add those two and you get 103.5%, not 100%. The extra is the bookmaker's margin, known as the vig or juice. On 4Football we strip it out by scaling the two sides to total 100%, which is what our "implied win %" column shows.
The total (over/under)
O/U 47.5 is the market's estimate of the combined score. Over wins at 48 or more, under at 47 or fewer. Totals are heavily influenced by pace, quarterback health and weather — wind above roughly 15 mph matters far more than cold or light rain, which is one reason we print the National Weather Service forecast beside every outdoor game on the schedule.
Why −110?
Spreads and totals are usually priced at −110 on both sides: risk $110 to win $100. At that price you need to win 52.4% of your bets just to break even. That single fact explains why long-term profit is so rare, and why any "system" claiming 60% should be treated with suspicion.
Reading ATS and O/U records
ATS means against the spread. A team that is 10-7 straight up might be 7-10 ATS if it kept winning by less than expected. Our odds page lists, for every NFL team:
- ATS record this season and over the last three seasons
- Over/under record — how often their games went over the closing total
- Straight-up record as a favourite and as an underdog
These are computed from closing lines in the open nflverse dataset. They are descriptive, not predictive: a team that covered at 60% last year is not "due" to keep doing so, because the market adjusts the number. Treat trends as context for a matchup, never as a reason by themselves.
A quick glossary
- Cover — beat the spread.
- Push — land exactly on the number; stake returned.
- Closing line — the last price before kickoff, generally the most accurate.
- Line movement — the change between opening and closing numbers, driven by money and news.
- Juice / vig — the bookmaker's built-in margin.