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Understanding Betting Odds

6 min read

Every betting market is just odds in one of three formats. Once you can read all three and convert them to a percentage, you can compare any price across any bookmaker.

The three odds formats

Decimal odds (2.50) show your total return per unit staked. Fractional odds (3/2) show profit relative to stake. American odds (+150 / -200) show how much you win on 100, or how much you must stake to win 100.

They all describe the same thing. 2.50 decimal = 3/2 fractional = +150 American. Pick the format you find easiest and convert the rest to it.

Converting odds to a probability

For decimal odds, divide 1 by the number: 1 ÷ 2.50 = 40%. This 'implied probability' is the bookmaker's estimate of the outcome, plus their margin.

Comparing that implied probability with your own estimate is the whole basis of value betting — back outcomes where you think the true chance is higher than the odds suggest.

Frequently Asked Questions

Continue Learning

How To Read Betting OddsLearn how to read betting odds — decimal, fractional and American Vegas lines — and turn any price into a real probability in under a minute.Calculating Odds & PayoutsLearn to calculate returns, implied probability and the bookmaker margin so you always know what a bet is really worth.Value Betting ExplainedWhat value betting is, how to find value bets using implied probability, and how Statlign surfaces positive-EV picks with a 50-strategy engine.Bankroll ManagementProtect your bankroll with disciplined stake sizing, flat-stake rules and the Kelly Criterion.Moneyline Betting ExplainedWhat a moneyline bet is, how to read + and − money line odds, and how the moneyline works in NFL, NBA, NHL, MLB and 3-way soccer markets.Point Spread & HandicapsHow point spreads and handicaps work across NFL, NBA, NHL, MLB and soccer — and how they level the playing field between mismatched teams.Over/Under Betting ExplainedHow over/under (totals) betting works — the 2.5 goals line, Asian totals, team totals and how to spot value in NBA/NFL over-under lines.HT/FT Betting ExplainedHow half-time/full-time (HT/FT) betting works, the six combinations, why it pays big odds and how to find HT/FT value with data.Parlays & AccumulatorsHow parlays/accumulators combine multiple bets for bigger payouts, the maths behind acca odds, and how to build them wisely.BTTS Betting TipsHow to find value in the Both Teams To Score market using attacking and defensive form, and common BTTS mistakes to avoid.Correct Score Betting TipsHow to approach the high-odds correct score market, the most common scorelines, and how to build value without chasing longshots.MLS Betting GuideHow to bet on MLS — best markets, home-field trends, playoff lines and how Statlign generates data-driven Major League Soccer predictions.NBA Betting GuideHow to bet the NBA — moneyline, point spread, totals, player props and situational spots — plus how Statlign generates data-driven NBA predictions.AI vs. Human Tipsters: Serie AA head-to-head comparison of AI-driven Serie A predictions and traditional human tipsters — accuracy, bias, transparency, coverage and cost, with the evidence behind each.

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