Gambling terms, explained straight

Sports Betting

Betting unit

A betting unit is the smallest stake increment a bookmaker or casino allows, and every wager must be a multiple of that amount.

Example
In a game with $20 and $40 limits, the betting unit is $5, so all bets must be multiples of $5.1
Purpose
Simplifies handling of bets and payouts in fixed-limit settings.1

Key points

  • The operator sets the smallest allowed stake increment; all wagers must be exact multiples of that unit.1
  • A betting unit is the minimum increment set by the operator, whereas unit size is a bettor's chosen reference stake.1

Common questions

What does 2 units mean in gambling?

2 units means a bet of twice the standard stake amount. For example, if your unit size is £10, 2 units is a £20 bet.

What is unit size in betting?

Unit size is the fixed stake amount a bettor chooses to standardise their wagers. It differs from a betting unit, which is the operator's minimum increment.1

Not the same as

  • Live betting — wagers placed during an event, not the stake increment itself2
Sports betting Spread betting A form of betting where the payout depends on the accuracy of the wager, not a fixed outcome. Sports betting Moneyline betting Simply picking which team or player will win an event outright. Sports betting Score betting Betting on the exact final score or a specific scoreline of a match. Sports betting Vig betting Betting that accounts for the bookmaker's commission, or vig, built into the odds. Sports betting Vigorish betting Another term for vig betting, referring to the bookmaker's cut on a wager. Sports betting Handicap betting A bet where one side is given a virtual advantage or disadvantage to level the playing field.

Sources

  1. Betting in poker en.wikipedia.org Provides the definition of betting unit, an example with $5 increments, and distinguishes it from unit size.
  2. Sports betting en.wikipedia.org Confirms the term applies to sports betting and distinguishes it from live betting.

Sources are drawn from regulators, universities and published research, and each one is labelled with what it actually is — a preprint is not called a paper. Bookmaker and affiliate pages are never cited here, because a page that sells betting is not a neutral authority on it.

Written and maintained by Ellis Warrender, writer and maintainer.

Last updated 28 July 2026. Spotted an error? Tell me and it gets fixed and logged on the corrections page.