Sports Betting Guide: Odds, Bet Types and Key Concepts

Sports betting means staking money on the outcome of a sporting event at odds offered by a bookmaker or betting platform. If the selection wins, the bet pays out according to those odds; if it loses, the stake is gone. Every bet combines the same few parts: an event, a market, a selection, the odds and the stake.

This page is X33's overview of the topic. It explains the core ideas in plain language and points to our detailed guides, most of which currently cover football.

The parts of a bet

• Event: the match or competition being bet on.
• Market: the question the bet answers, such as the match result or the total number of goals.
• Selection: the specific outcome chosen within that market.
• Odds: the price of the selection, which sets the payout and implies a probability.
• Stake: the amount placed on the bet.
• Settlement: how the bookmaker decides whether the bet won, lost or was refunded, according to its rules.

Most betting terms describe one of these parts. Our football betting glossary defines the common ones.

How odds work

Odds do two jobs at once: they tell you what a winning bet pays, and they express the bookmaker's view of how likely an outcome is. The same price can be written in several formats. Decimal odds are the most common internationally, while Malay, Hong Kong and Indo odds are widely used in Asian markets.

• How to read football odds starts from zero with Malay odds.
• Odds format conversion shows how the four formats translate into one another.

Implied probability

Any decimal price can be turned into the probability it implies: implied probability = 1 ÷ decimal odds. A price of 2.00 implies 50%; a price of 4.00 implies 25%. This is the bookmaker's estimate built into the price, not an objective truth about the match. The full method is in implied probability and the operator's margin.

Bookmaker margin

In a typical bookmaker market, adding up the implied probabilities of every outcome gives a total above 100%. The excess is the bookmaker's margin, also called the overround, vig or juice. It is built into the prices themselves, so someone who keeps betting at those prices should expect to get back less than they stake over time. No staking system or betting pattern removes it.

Margins are not the same everywhere: they differ between bookmakers and between market types. Why bookmaker margin varies across market types looks at the reasons.

The main market families

Football offers dozens of markets, but most belong to a handful of families. Our complete football betting markets guide maps them all; types of football markets covers the three most common ones for beginners.

• Match result: who wins, or which results a bet covers. See double chance and draw no bet.
• Handicap: who wins once one side is given a virtual goal head start. See Asian handicap half and quarter lines.
• Totals: how many goals are scored. See Over/Under quarter lines, team total goals and odd/even goals.
• Score-based: the exact score, or whether both teams score. See correct score and BTTS.
• Time-based: what happens in part of the match. See first half markets and HT/FT.
• Match events: events other than goals. See corners and cards.

Singles, parlays and the bet slip

A single is one selection on one bet. A parlay (called a mix parlay in Malaysia, and also known as an accumulator or combo) joins several selections into one bet: the odds are multiplied, so the potential payout grows, but every selection must win for the bet to pay. The risk grows with each added selection. See what a mix parlay is and how it is calculated.

Every bet is recorded on a bet slip showing the selection, odds, stake and potential return. How to read a bet slip walks through each field.

Pre-match and live betting

Bets can be placed before an event starts (pre-match) or while it is being played (live or in-play). In-play prices move continuously with the game, and markets can be suspended briefly after key moments. Live (in-play) betting explains how it works.

How bets are settled

Each platform publishes settlement rules covering details such as which period of play counts, what happens if a match is postponed or abandoned, and how refunds work. For football, most markets are settled on the result after 90 minutes plus stoppage time; extra time and penalty shoot-outs are excluded unless the market says otherwise. How to understand a platform's settlement rules covers what to check.

Other sports

The same building blocks — odds, markets, margin and settlement — apply to other sports too. Each sport has its own market structure and its own settlement details, so rules that hold for football should not be assumed elsewhere.

Tournament guides

Major tournaments bring many one-off markets. For the 2026 FIFA World Cup, see our World Cup 2026 betting guide, how the 48-team format works and how common World Cup markets are settled.

A suggested learning path

1. Learn to read odds and convert between formats.
2. Understand implied probability and margin.
3. Get to know the main market types.
4. Learn how parlays and bet slips work.
5. Read the settlement rules before placing any bet.

Betting responsibly

Because the margin is built into the prices, regular betting should be expected to lose money over time. It is not a way to make money. Treat any betting as paid entertainment, set a budget in advance, and never try to win back losses. Our guides to responsible gambling and common beginner mistakes and money management cover limits, warning signs and where to get help in Malaysia.

X33 publishes educational content only. We do not take bets or operate a betting platform.