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All betting terms

Betting Glossary

Return on Investment (ROI)

Definition

Net profit in units divided by total units staked, shown as a percentage. ROI measures how efficiently a set of bets turned risk into profit; a 5% ROI means 5 units returned for every 100 staked.

Related terms

  • Unit — A standardized stake (typically 1–2% of bankroll) used to track results independent of dollar amounts, e.g. +12.5u.
  • Win Rate — The share of settled bets that won (pushes and voids excluded). Read alongside ROI and units — a high win rate on heavy favorites can still lose money.

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