About

What Betting Maths does

Betting Maths provides calculators and guides to help explain how common betting calculations work.

The site covers topics such as:

• Decimal, fractional and American odds.
• Implied probability.
• Overround and bookmaker margin.
• Dutching and stake splitting.
• Hedging, backing, laying and lay liability.
• Exchange commission.
• Common betting jargon and betting maths terms.

Why the site exists

Betting can be full of confusing terms and calculations. Many people see phrases such as overround, book percentage, implied probability, lay liability or dutching without clearly understanding what they mean.

Betting Maths aims to make those ideas easier to understand with simple calculators, examples and plain-English explanations.

What Betting Maths is not

Betting Maths is not a tipster site, prediction service or gambling system.

• We do not provide betting tips.
• We do not predict sports results.
• We do not recommend specific bets.
• We do not claim that gambling profit is guaranteed.
• We do not provide personalised financial or gambling advice.

How to use the site

A good place to start is with the main calculators:

You can also use the Betting Jargon Explained page as a glossary for common betting terms.

Responsible gambling

Betting Maths is designed to explain calculations, not encourage gambling. Understanding the maths behind betting can help you understand risk more clearly, but it cannot remove risk.

If gambling is causing stress, debt or harm, please visit the Responsible Gambling page for support information.