NFL Betting Guide: How the Main Markets Work

American football attracts huge betting volumes in the United States, and its markets are now offered in several other countries too. This guide explains how the main NFL markets work, how American odds convert into probabilities and why every price carries a margin. It is written for adults in the UK, USA, Ireland, Canada and Australia, and it is educational only.

It does not recommend teams, players or bets, and no market makes winning likely. For the basic vocabulary, see US sports betting: spreads, moneylines and totals.

How the season is structured

Each team plays 17 regular-season games over 18 weeks, so every team has one bye week. Fourteen teams, seven from each conference, reach the playoffs. This structure matters for betting because there are few games. Each result is a large share of a team’s season, and the market for a single game attracts heavy attention.

Prices are posted days ahead and move when new information arrives, such as injuries, weather or heavy betting on one side. Prices posted early and prices posted late for the same game can differ.

The point spread

The spread gives the favourite a handicap. A line of Team A -3.5 means Team A must win by four or more for a bet on them to win. A bet on Team B at +3.5 wins if Team B wins outright or loses by three or fewer.

Half-points exist to avoid a tie on the line. If the spread is a whole number, such as -3, and the favourite wins by exactly three, the bet is a push and your stake is returned.

Most spread bets are priced at -110 on each side. That means you stake 110 to win 100. The break-even rate is 110 divided by 210, which is 52.38%. So a spread bettor must be right more than 52.38% of the time just to cover the margin.

Key numbers

Scores in American football cluster around certain margins. A field goal is worth three points and a touchdown with the extra point is worth seven, so margins of three and seven occur more often than others. Bettors call these key numbers. The difference between a spread of -2.5 and -3.5 is therefore bigger than the difference between -4.5 and -5.5, because more games finish by exactly three. Sportsbooks know this and price accordingly, so the idea does not create an advantage on its own.

The moneyline

The moneyline is a bet on who wins, with no spread. American odds use a plus or minus sign. A negative number shows how much you must stake to win 100. A positive number shows how much you win from a 100 stake.

Converting to implied probability is simple. For negative odds, divide the number by itself plus 100. For positive odds, divide 100 by the number plus 100. Here is a worked example.

• Favourite at -150: 150 divided by 250 is 60.00%.
• Underdog at +130: 100 divided by 230 is 43.48%.
• Total: 103.48%. The extra 3.48 points are the sportsbook’s built-in margin.

The odds formats guide shows how to convert between American, decimal and fractional prices.

Totals

A total, or over/under, is a bet on the combined score of both teams. If the line is 44.5, a 24-20 game finishes on 44, so the under wins. Spreads and totals normally include overtime, but check the rules of the operator you use.

Player props and parlays

Props are bets on individual outcomes, such as a quarterback’s passing yards or whether a player scores a touchdown. They are often priced with a bigger margin than spreads and totals, and limits are usually lower. If a player does not play, many sportsbooks void the prop, though terms differ.

A parlay combines several selections into one bet, and every leg must win. The margin on each leg compounds, so the sportsbook’s expected edge grows with the number of legs. Same-game parlays explained and prop bets explained look at both in depth.

Spending risk

NFL games are weekly events but betting is not limited to kick-off. In-play markets, props and parlays mean many small bets can build up across one afternoon. Decide your limit before the game starts, and use the spend tracker to see what a weekend adds up to.

Rules by country

• United Kingdom: NFL betting is offered by operators licensed by the UK Gambling Commission, usually with decimal or fractional odds. You must be 18 or over, and GAMSTOP covers UK-licensed online sites.
• United States: Regulation is state by state. Sports betting is legal in most states, with the minimum age 21 in most places and 18 in some. Winnings are taxable income at federal level, and larger wins may be reported on a Form W-2G.
• Ireland: Betting is moving to the new licensing regime under the Gambling Regulation Act 2024. The minimum age is 18. There is no national self-exclusion register yet.
• Canada: Single-event sports betting has been legal since August 2021. Provinces regulate it, with a minimum age of 19 in most provinces and 18 in Alberta, Manitoba and Quebec.
• Australia: Licensed bookmakers can offer NFL wagering to adults aged 18 and over. BetStop is the national self-exclusion register, and credit cards are banned for licensed online wagering.

The bottom line

The main NFL markets are simple to read once you know that -110 means a margin, that key numbers shape spreads, and that parlays and props usually cost more than straight bets. None of this removes the sportsbook’s edge. Set a budget before kick-off, stay out of chasing losses, and use self-exclusion tools if betting stops being fun.

Sources

• NFL playoff format and bye weeks (nbcsportsboston.com)
• Key numbers and point spreads explained (thespread.com)
• Single-event sports betting in Canada (agco.ca)
• Prop betting rules: what happens if a player does not play (actionnetwork.com)

18+ only (21 in most US states, 19 in most Canadian provinces for casino and betting). Gambling can be addictive. Free, confidential help is available: Great Britain: England and Scotland 0808 8020 133, Wales 0808 2819 265 (free, 24 hours), and GAMSTOP (gamstop.co.uk); US: National Problem Gambling Helpline 1-800-MY-RESET (the older 1-800-522-4700 also works); Australia: Gambling Help Online 1800 858 858 and BetStop (betstop.gov.au); Ontario, Canada: ConnexOntario 1-866-531-2600; Ireland: speak to your GP or the HSE. Never gamble money you need for living costs.