MargusMargus Learn
Betting and prediction market guides
Plain-language guides to prices, probabilities, markets, and responsible comparison.
How to Read Betting Odds: American, Decimal & Fractional
Learn how to read betting odds in American, decimal and fractional formats, with worked NFL and Premier League examples and a quick conversion cheat sheet.
Read guide →Implied Probability: How to Calculate It From Odds
What implied probability is, how to calculate it from American, decimal and fractional odds, how to remove the margin, and how to use it to find value bets.
Kalshi Odds vs Sportsbooks: How Kalshi Works
Kalshi odds explained: how event contracts are priced, how fees work, where to check availability, and how Kalshi compares with sportsbook odds today.
All guides
- How to Read Betting Odds: American, Decimal & FractionalLearn how to read betting odds in American, decimal and fractional formats, with worked NFL and Premier League examples and a quick conversion cheat sheet.LearnBeginner
- Implied Probability: How to Calculate It From OddsWhat implied probability is, how to calculate it from American, decimal and fractional odds, how to remove the margin, and how to use it to find value bets.LearnBeginner
- Kalshi Odds vs Sportsbooks: How Kalshi WorksKalshi odds explained: how event contracts are priced, how fees work, where to check availability, and how Kalshi compares with sportsbook odds today.Prediction marketsBeginner
- Kalshi vs Polymarket: Fees, Prices and Sports ComparedKalshi vs Polymarket compared for sports: contracts, fees, liquidity, regulation and settlement rules, plus how to check which has the better price today.Prediction marketsIntermediate
- Line Shopping: How to Find the Best Odds Every TimeWhat line shopping is, why comparing odds across sportsbooks and prediction markets matters, worked NFL and Premier League examples, and a simple routine.LearnBeginner
- Polymarket Odds vs Sportsbooks: Polymarket US GuidePolymarket odds explained: how Polymarket US contracts are priced, its published fee formula, availability, and how its prices compare with sportsbooks.Prediction marketsBeginner
- Prediction Markets vs Sportsbooks: Which Has Better Odds?How prediction markets like Kalshi and Polymarket differ from sportsbooks: pricing, fees, liquidity, limits and regulation, and how to compare their odds.LearnIntermediate
- What Is Vig? Juice, Overround & Bookmaker MarginWhat vig, juice and overround mean, how to calculate a bookmaker's margin on two-way and three-way markets, and how to bet into lower-margin prices.LearnBeginner