Calculation and Data Methodology
This page explains how calculator outputs and anonymous market snapshots are produced, which assumptions they use, and why a detected price difference is not a guaranteed outcome.
Implied probability and opportunity test
For decimal odds, implied probability is calculated as 1 ÷ odds. The implied probabilities of all mutually exclusive outcomes are added together. A total below 100% indicates a theoretical arbitrage at those exact entered or observed prices.
The calculator then assigns stakes in proportion to each outcome's implied probability so the unrounded theoretical return is equal across outcomes. The detailed formulas and examples are published in How to Calculate Arbitrage Betting.
Quoted prices and timestamps
A scanner result is a snapshot, not a promise that a provider will accept the same price or amount later. Prices may move, feeds can be delayed, events can suspend and operator pages can use different settlement rules. Users must verify all details directly before making any decision.
Aggregate market snapshot
The market snapshot uses completed historical scans stored by ArbScanner. It excludes the current UTC day to avoid presenting an incomplete day as a complete reporting period. The page counts valid scan records, whether each scan contained at least one candidate, 2-way and 3-way candidate totals, and the distribution of each scan's highest recorded net edge.
The report does not expose user names, email addresses, stakes, account balances or individual activity. Figures describe what the software detected in its historical sample; they do not describe realised bets or returns.
Content standards
- Mathematical examples are designed to be reproducible with the public calculator.
- Australian regulatory statements link to official government sources.
- Content is attributed to the Arbitrage Scanner organisation rather than a fabricated individual author.
- Publication and review dates change only when the page is materially reviewed.
- Risk and limitation statements appear near relevant claims rather than being hidden in a footer.
What ArbScanner does not do
ArbScanner does not place bets, accept wagers, hold bookmaker funds, guarantee that a price remains available, guarantee provider acceptance, provide personalised financial or legal advice, or promise profit. A user remains responsible for legality, account terms, market matching, execution and risk.