- It's imperative to use live NFL odds for every spread, total and money line for the games in a given week. If the number is positive, then you bet $100 to win that amount. If the number is negative, you have to wager that amount to win $100.Sometimes it will be necessary to use a conversion chart to translate the money lines to take advantage of the betting opportunities that spreads in a week.
- NFL Betting Strategy Course 101. Gambling has become one of the most popular sports activities among all fans throughout the country, and with states beginning to pass measures to legalize sports gambling, it is only going to become more popular with time.
A common phrase heard from experienced football bettors is: “I don’t bet teams, I bet numbers.”
Picking the winning team in a football game isn’t easy. It’s even more difficult to place a winning wager on a game that involves a point spread or total.
Find top NFL Betting Odds, Scores, Matchups, News and Picks from VegasInsider, along with more pro football information to assist your sports handicapping. Betting against the public (also known as fading the public) is one of the most popular NFL betting strategies. Basically, how it works is that you have a look at public betting trends for an upcoming game. Then, bet against the outcome the public has favored. This strategy is usually reserved for big games, such as the playoffs or Super Bowl. VSiN’s NFL expert dives into betting angles for the three Saturday NFL playoff games. Indianapolis Colts at Buffalo Bills (-6.5, 51.5) It’s always easier to make an argument for the favorite.
Bettors look for key numbers. These numbers in football betting (and to a lesser extent basketball) are the most common margin of victory of the final score or the point totals. These key numbers are accessible using years of final score data that can be found fairly easily online, as you’ll see shortly.
When betting on NFL games there are two specific key numbers that bettors keep an eye on. These two specific margins of victory occur much more often than any others. The most frequent margin of victory in both college and pro football is 3 points. The second most frequent margin of victory is 7 points.
These are key numbers for both sportsbook operators and bettors. In this article we’ll look at the two key numbers in football for betting full game point spreads since this is the most popular type of wager. We’ll also take a look half points, buying points to avoid a key number, if there are certain key numbers for totals, and the possibility of the key numbers becoming obsolete someday.
NFL margin of victory
The margin of victory is the number of points a team wins by. The margin of victory may mean something different to football teams than bettors. Teams might be proud of winning by a lot of points. They can keep pushing the score up or lay off as the game comes to a close.
The losing team could take offense to how they were beaten and seek retribution next time they play. Likewise, they could just see the loss as a bad day at the office. This is one possible short term effect of the margin of victory in a football game. Bettors could use this emotion as part of their handicapping a football game.
The margin of victory for football games is useful for sportsbooks in setting a point spread. Bookmakers and bettors both use this long term data and possible short term implications. At the same time, football bettors use the information when handicapping a game and placing a wager.
Nfl
There is so much data — good and bad — available today that it’s easy to get lost in the information. Key numbers are one data point that is always useful for placing a wager.
Betting the point spread
Moneyline wagers are relatively simple. Just pick a team and the wager will either win or lose. Point spreads are a different monster. Sportsbooks can create a point spread for a game so that each team playing has an almost even chance of winning the game.
A good point spread should attract bettors on both sides of a game. While sportsbooks don’t necessarily want equal money on both sides, they don’t want the money entirely on one side for every football game. This puts the book at risk of major losses.
Sportsbook operators know the key numbers and use them to their advantage. You’ll often the line on a football game stay at 3 or 7 for longer than other point spreads. Sportsbooks will add vigorish (vig) as much as possible before moving instead of moving off the number.
During football games, you might see the point spread remain at 3 or 7 but the vig moves from -100 to -120 then to -130 before moving to either 2.5 or 3.5. The extra vig gives the sportsbook a little more of an edge in case the margin of victory lands in the key number.
If bettors place wagers with a higher vig, the casino won’t lose as much if the final score lands on the key number. Understanding the key numbers could be the difference between placing a winning or losing wager.
What are the key numbers?
The most common margin of victory at the end of both college and pro football games is 3 points. According to Wizard of Odds, the probability that an NFL game finished with a 3 point margin is around 14.5%.
The next closest margin of victory is 7 points. Games from 2006 through Week 1 of the 2018 season finished with a 7 point margin 9.2% of the time. This large sample size covers a total of 3,220 games.
During this sample, nearly 1 in every 4 games finished with a margin of victory of 3 or 7 points. The actual number of games to end with a margin of victory of exactly 3 or 7 points was 23.7%. That’s a lot of games ending on those key numbers, and that’s why they are so important when wagering on football.
For a better comparison here’s the probabilty for every margin of victory from 0 points to 21 points in NFL games since 2006 from Wizard of Odds.
0 = 0.2%
1 = 3.7%
2 = 3.8%
3 = 14.5%
4 = 5.2%
5 = 3.4%
6 = 6.2%
7 = 9.2%
8 = 3.6%
9 = 1.7%
10 = 5.6%
11 = 2.5%
12 = 1.5%
13 = 2.9%
14 = 4.8%
15 = 1.5%
16 = 2.1%
17 = 3.1%
18 = 2.3%
19 = 1.1%
20 = 2.4%
21 = 3.2%
22 and higher = 15.7%
Understanding why these are key numbers isn’t difficult but it’s important. Since more football scores are worth 3 points or 7 points (6 points for a touchdown plus 1 for an extra point) it’s easy to see why the margin of victory falls at each of these numbers.
The probability for the margin of victory in college football is similar but slightly different.
Keep an eye on the hook
A “hook” is a slang term for a half-point. When looking at the key numbers, the hook is a half-point away from the 3- and 7-point margin of victory.
The main hook to keep an eye is around the 3-point line. These point spreads are 2.5 and 3.5. The second hook to look for is around the key number of 7. These point spreads are 6.5 and 7.5.
Since nearly 25% of games end with a margin of victory of 3 or 7, finding a point spread just off that number could be the difference between placing a winning bet with the hook or getting a push with the flat number.
Shopping around different sportsbooks comes in handy when looking for an extra half-point on a game. If a bettor can’t find a preferred half point spread, they may choose to buy points. Depending on the sportsbook a half point will add another 10% to the vig. For example, buying a half point from 3 to 2.5 or 3.5 will change the odds from -110 to -120.
A winning wager on a 3-point spread at -110 would pay $100 for every $110 wagered. Buying a half point would mean that the bettor will have to wager $120 to win that same $100. It’s not much on a single wager but it adds up over time.
Key numbers in the future
NFL rules change every season. One relatively new rule that is already starting to affect the key numbers is the extra-point distance. Kicking and extra points used to take place with the ball starting at the two yard line. This was almost a guaranteed point for NFL teams.
Since 2015, NFL extra points begin at the 15 yard line. The pseudo 33-yard field goals are no longer thought of as a guarantee. This rule is already changing the game. In the past couple of years, more coaches are going for two-point conversions instead of attempting an extra point.
This three year sample is too small to gauge the true effect of the new extra point distance on the key numbers. However, kickers are missing more extra points and coaches are skipping the extra point. The days could be ending for 7 as a key number since touchdowns might be worth 6 or 8 points more often in the future.
Key numbers for NFL totals
There are key numbers for NFL totals but they’re a bit more widespread than key numbers for point spreads. The Wizard of Odds research shows that final score totals land on a variety of numbers.
Some key numbers to keep an eye on for totals betting are 43, 44, 41, and 37. Of the 3,220 games recorded, the total landed on each of these key numbers at least 120 times (37) but no more than 126 times (43), respectively.
The next level of key numbers for NFL totals are 51, 47, 40, and 33. During the same period the total landed exactly on these numbers between 119 times (51) and 102 times (33), respectively.
While there are key numbers for NFL totals, the final score isn’t contained to just two key numbers.
Introduction
This page assumes the reader already has a good grasp of sports betting terminology. If this is not the case, I recommend reading my general page on sports betting first.
Unless otherwise stated, the source of this data is every NFL game played from the 2006 season through and including week 1 of the 2018 season. This is a total of 3,220 games. The data is available for free at Australia Sports Betting.
Point Spread Bets
I admit 'point spread bet' is not a common term in sports betting, but I'm trying to change that. What I call a point spread bet is a basic bet against the point spread. Many people call this a 'straight bet' but this term can also be used, and is printed on tickets for, money liney bets, total bets, and any other bet involving just one game. So I invite the rest of the world to adopt this term.
The following table shows the probability of winning, losing, and pushing according by various breakdowns.
Point Spread Bets in the NFL
| Bet | Wins | Losses | Pushes | Win Rate | Std. Dev. | N.S.D. | Return |
|---|---|---|---|---|---|---|---|
| All home | 1,484 | 1,680 | 56 | 46.90% | 1.26% | -2.46 | -10.28% |
| All away | 1,680 | 1,484 | 56 | 53.10% | 1.26% | 2.46 | 1.34% |
| All favorite | 1,488 | 1,617 | 56 | 47.92% | 1.27% | -1.64 | -8.36% |
| All underdog | 1,617 | 1,488 | 56 | 52.08% | 1.27% | 1.64 | -0.57% |
| Home underdog | 492 | 520 | 20 | 48.62% | 2.22% | -0.62 | -7.05% |
| Home favorite | 968 | 1,125 | 36 | 46.25% | 1.55% | -2.43 | -11.51% |
| Away underdog | 1,125 | 968 | 36 | 53.75% | 1.55% | 2.43 | 2.57% |
| Away favorite | 520 | 492 | 20 | 51.38% | 2.22% | 0.62 | -1.87% |
| Home pick | 24 | 35 | 0 | 40.68% | 9.21% | -1.01 | -22.34% |
| Away pick | 35 | 24 | 0 | 59.32% | 9.21% | 1.01 | 13.25% |
| All | 3,164 | 3,164 | 112 | 50.00% | 0.89% | 0.00 | -4.47% |
Explanation of column headings:
- Bet: Type of bet
- Wins: Number of wins against point spread
- Losses: Number of losses against point spread
- Pushes: Number of pushes against point spread
- Win Rate: Ratio of wins to bets resolved
- Std. Dev.: One standard deviation in the mean of the win rate, assuming every bet had a theoretical chance of winning of 50%.
- N.S.D: Number of standard deviations that the actual results differ from an expected win rate of 50%.
- Return: Ratio of money won (lost = negative) to money bet, assuming laying 11 to win 10.
Over/Under Bets
The following table shows the results of under and over bets. It shows both had nearly a 50% chance of winning. In face, over 3,220 games the over won just two more times than the under. I thought under bets would have performed better, but I've been wrong before.
Under and Over Bets in the NFL
| Bet | Wins | Losses | Pushes | Win Rate | Std. Dev. | N.S.D. | Return |
|---|---|---|---|---|---|---|---|
| Over | 1,586 | 1,576 | 58 | 50.16% | 1.26% | 0.13 | -4.17% |
| Under | 1,576 | 1,586 | 58 | 49.84% | 1.26% | -0.13 | -4.76% |
Money Lines
The following brief table shows the result of money line bets.
Money Line Bets in the NFL
The next table shows the actual and estimated probability of winning for underdogs of 1 to 14.5 points. Obviously, the probability of the favorite winning would be 100% less the probability of the underdog winning. The estimated probability of winning uses logistic regression to smooth out the ups and downs.
Probability of Winning by Point Spread in the NFL
| Spread | Games | Wins | Actual Probability | Estimated Probability | Fair Line |
|---|---|---|---|---|---|
| 1 | 139 | 69 | 49.6% | 46.4% | 115 |
| 1.5 | 88 | 43 | 48.9% | 44.6% | 124 |
| 2 | 126 | 51 | 40.5% | 42.9% | 133 |
| 2.5 | 224 | 98 | 43.8% | 41.1% | 143 |
| 3 | 517 | 235 | 45.5% | 39.4% | 154 |
| 3.5 | 279 | 107 | 38.4% | 37.7% | 165 |
| 4 | 157 | 59 | 37.6% | 36.1% | 177 |
| 4.5 | 128 | 47 | 36.7% | 34.4% | 191 |
| 5 | 89 | 23 | 25.8% | 32.8% | 205 |
| 5.5 | 118 | 38 | 32.2% | 31.3% | 220 |
| 6 | 133 | 45 | 33.8% | 29.7% | 236 |
| 6.5 | 147 | 42 | 28.6% | 28.3% | 254 |
| 7 | 220 | 51 | 23.2% | 26.8% | 273 |
| 7.5 | 146 | 36 | 24.7% | 25.5% | 293 |
| 8 | 65 | 14 | 21.5% | 24.1% | 315 |
| 8.5 | 52 | 16 | 30.8% | 22.8% | 338 |
| 9 | 58 | 13 | 22.4% | 21.6% | 363 |
| 9.5 | 48 | 6 | 12.5% | 20.4% | 390 |
| 10 | 104 | 19 | 18.3% | 19.3% | 419 |
| 10.5 | 61 | 15 | 24.6% | 18.2% | 450 |
| 11 | 41 | 4 | 9.8% | 17.1% | 483 |
| 11.5 | 22 | 4 | 18.2% | 16.1% | 519 |
| 12 | 13 | 3 | 23.1% | 15.2% | 558 |
| 12.5 | 25 | 4 | 16.0% | 14.3% | 599 |
| 13 | 34 | 6 | 17.6% | 13.4% | 644 |
| 13.5 | 36 | 4 | 11.1% | 12.6% | 692 |
| 14 | 36 | 3 | 8.3% | 11.9% | 743 |
| 14.5 | 12 | 1 | 8.3% | 11.1% | 798 |
If you want to estimate the probability of winning of an underdog of more than 14.5 points, the formula is e^(-0.14324*s)/(1+e^(-0.14324*s)), where s is the point spread. To convert any probability under 50% to a fair money line, the formula is 100*(1-p)/p, where p is the probability of winning. To convert any probability over 50% to a fair money line, the formula is -100*p/(1-p).
Parlays
Here is my quick advice on parlays:
- If you bet off the board, either do a pick-3 or mix in one leg that isn't at the standard -110 odds, to get off the lousy parlay odds table, and force a fair calculation.
- On parlay cards, try to capture as many points as you can compared to the 'off the board' point spread.
I have much more information about parlays in my page on Parlay Bets in the NFL.
Teasers
Here is my quick advice on teasers:
- If you bet off the board, the best odds are at Jerry's Nugget.
- Try to cross the 3- and 7-point margin of victories with the extra points.
- Teaser cards are a sucker bet.
- If you must bet a teaser card, I recommend the the Ties Win Teaser Card at any Caesars sports book.
- On teaser cards, try to capture as many points as you can compared to the 'off the board' point spread.
I have lots more information about teasers in my page on Teaser Bets in the NFL.
Buying Half a Point off the Spread
Sometimes a sports book will let you buy a half point off the spread for total. For example, moving a point spread from +10 to +10.5. The price for this is laying an extra cents, in most cases laying 120 instead of 110. However, rarely will a sports book let the player buy onto point spreads of 3 or 7, for example moving from +2.5 to +3, because 3 and 7 are frequent margin of victories (MOV) in the NFL. To be specific, the margin of victory is three 14.5% of the time, and seven 9.2%, as the following table shows.
Margin of Victory in the NFL
| MOV | Probability |
|---|---|
| 0 | 0.2% |
| 1 | 3.7% |
| 2 | 3.8% |
| 3 | 14.5% |
| 4 | 5.2% |
| 5 | 3.4% |
| 6 | 6.2% |
| 7 | 9.2% |
| 8 | 3.6% |
| 9 | 1.7% |
| 10 | 5.6% |
| 11 | 2.5% |
| 12 | 1.5% |
| 13 | 2.9% |
| 14 | 4.8% |
| 15 | 1.5% |
| 16 | 2.1% |
| 17 | 3.1% |
| 18 | 2.3% |
| 19 | 1.1% |
| 20 | 2.4% |
| 21 | 3.2% |
| 22+ | 15.7% |
| Total | 100.0% |
The following table shows the fair price to pay for most spreads and totals. For example, moving the spread from +2.5 to +3, +3 to +3.5, -3.5 to -3, or -3 to -2.5, would be buying the 3. In these cases if the favorite won by 3, or the underdog lost by 3, then it would turn a push into a win, or a loss into a push. The table shows the fair price to pay for extra half point, to equal the expected loss of 4.54% laying 11 to win 10. The bottom line is you should definitely buy the half point off of three, if you can, and it is marginally good off of seven. Anything else and it is a bad value.
Buying a Half Point Off the Spread
Buying Half a Point off the Total
Betting Nfl Totals
The overall fair number of basis points to pay for a half point off the total is 8.12. In other words, you should be indifferent to laying 11 to win 10 and laying 118.12 to win 10 with an extra half point. The following table shows my suggested fair price to pay to capture totals from 30 to 60. By 'capture' I mean turn a push into a win or a loss into a push. If you have to lay 10 basis points for the half point, my table shows that it is never a good value, although sometimes it is close. An explanation of the column headings follows the table.
Buying a Half Point off the Over/Under in the NFL
| Total Points | Num. in Sample | Probability | Fair Price |
|---|---|---|---|
| 30 | 89 | 0.027640 | 6.58 |
| 31 | 48 | 0.014907 | 3.50 |
| 32 | 42 | 0.013043 | 3.06 |
| 33 | 102 | 0.031677 | 7.58 |
| 34 | 83 | 0.025776 | 6.13 |
| 35 | 52 | 0.016149 | 3.80 |
| 36 | 74 | 0.022981 | 5.45 |
| 37 | 120 | 0.037267 | 8.98 |
| 38 | 63 | 0.019565 | 4.62 |
| 39 | 62 | 0.019255 | 4.54 |
| 40 | 105 | 0.032609 | 7.81 |
| 41 | 121 | 0.037578 | 9.05 |
| 42 | 48 | 0.014907 | 3.50 |
| 43 | 126 | 0.039130 | 9.45 |
| 44 | 123 | 0.038199 | 9.21 |
| 45 | 82 | 0.025466 | 6.05 |
| 46 | 64 | 0.019876 | 4.69 |
| 47 | 113 | 0.035093 | 8.43 |
| 48 | 98 | 0.030435 | 7.27 |
| 49 | 61 | 0.018944 | 4.47 |
| 50 | 81 | 0.025155 | 5.98 |
| 51 | 119 | 0.036957 | 8.90 |
| 52 | 74 | 0.022981 | 5.45 |
| 53 | 51 | 0.015839 | 3.72 |
| 54 | 66 | 0.020497 | 4.84 |
| 55 | 85 | 0.026398 | 6.28 |
| 56 | 25 | 0.007764 | 1.81 |
| 57 | 63 | 0.019565 | 4.62 |
| 58 | 58 | 0.018012 | 4.24 |
| 59 | 40 | 0.012422 | 2.91 |
| 60 | 18 | 0.005590 | 1.30 |
Key to column headings:
- Total Points = Total point scored in game
- Num. in Sample = Number of times this total appeared in a sample of 3,220 games.
- Fair Price = My fair number of basis points to pay to capture this number (after a lot of math)
My page on alternate point spreads shows what it is worth to buy or sell up to seven points off the spread. That page has not been updated with the latest data yet.
Example
Assume the over/under on a game is exactly 43 points. My table shows the fair number of basis points to pay to capture the 43 is 9.45. This means you should be indifferent to laying 110 on the under 43 or over 43 to laying 119.45 on the under 43.5 or over 42.5.
Internal Links
- Alternate point spread calculator.
- Parlay calculator — What a parlay pay composed of events of miscellaneous odds should pay.
- Proposition bet calculator — Fair line for lots of common prop bets, given the point spread and total.
- NFL Average Scores per Game 2000-2020 — Historical scoring data from 2000 to 2020.
- Super Bowl proposition bets — Repository of Super Bowl proposition bet sheets from Las Vegas
Betting Nfl Parlays
Nfl Betting Lines Vegas
