What does ROI mean in betting?

ROI (Return on Investment) is total profit divided by total staked, shown as a percentage. It is the fairest way to compare tipsters.

A value bet is one where the odds offered are longer than the true probability of the outcome — the core of any winning long-term strategy.

What is the difference between backing and laying?

Backing is betting for an outcome to happen. Laying, available on betting exchanges, is betting against an outcome — you win if it does not happen.

What is the overround?

The overround is the bookmaker's margin: the implied probabilities of all outcomes total more than 100%, and that extra is the bookmaker's built-in edge.

What does ROI mean in betting?

ROI (Return on Investment) is total profit divided by total staked, shown as a percentage. It is the fairest way to compare tipsters because it accounts for how much was risked to achieve the profit.

A value bet is one where the odds offered are longer (bigger) than the true probability of the outcome. Consistently backing value is the only reliable route to long-term profit.

What is the difference between backing and laying?

Backing is betting for an outcome to happen (the standard bet). Laying, available on betting exchanges, is betting against an outcome — you win if it does not happen.

What is the overround?

The overround is the bookmaker's margin: when you add up the implied probabilities of all outcomes they total more than 100%. That extra is the bookmaker's built-in edge.

Reviewed by TipsterCheck Editorial TeamLast checked 26 October 2026Methodology Corrections

Glossary

Betting Terms Explained

Betting has a language all of its own. This is our plain-English glossary of the terms you'll meet across TipsterCheck and the wider betting world — so nothing a tipster says ever catches you out.

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In short

Betting terminology is the specialist vocabulary used across sports betting. The most important terms to know are ROI (profit as a percentage of total stakes), value bet (odds bigger than the true probability), bankroll (the money set aside for betting), stake (the amount wagered) and each-way (a win and place bet in one). Use the searchable A–Z below for any term.

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116 betting terms, each with a worked example and FAQs.

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Betting terms FAQ

What does ROI mean in betting?: ROI (Return on Investment) is total profit divided by total staked, shown as a percentage. It is the fairest way to compare tipsters because it accounts for how much was risked to achieve the profit.
What is a value bet?: A value bet is one where the odds offered are longer (bigger) than the true probability of the outcome. Consistently backing value is the only reliable route to long-term profit.
What is the difference between backing and laying?: Backing is betting for an outcome to happen (the standard bet). Laying, available on betting exchanges, is betting against an outcome — you win if it does not happen.
What is the overround?: The overround is the bookmaker's margin: when you add up the implied probabilities of all outcomes they total more than 100%. That extra is the bookmaker's built-in edge.

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