Make Smarter Bets
with Math

Calculate parlay odds, payouts, and round robin combinations for multi-leg bets.

Convert between American, Decimal, Fractional odds and implied probability.

Calculate implied probability from odds and remove the vig for true probabilities.

Calculate the vigorish (juice) a sportsbook charges on a given market.

Determine if a bet has positive or negative expected value based on your edge.

Calculate optimal bet sizing using the Kelly Criterion for bankroll management.

Calculate the optimal hedge bet to guarantee profit on an existing wager.

Find arbitrage opportunities across sportsbooks for risk-free profit.

Calculate the hold percentage a sportsbook takes on a market.

Calculate teaser payouts with adjusted point spreads and totals.

Convert point spreads to moneyline odds and vice versa.

Plan your betting bankroll with unit sizing and risk-of-ruin analysis.

How to Read Odds

American, decimal, and fractional odds explained with conversion formulas.

What is a Parlay?

Parlay mechanics, odds math, strategy tips, and a complete odds chart.

Point Spread Explained

How spreads work, key numbers, line movement, and buying points.

Over/Under Explained

Totals betting guide with analysis tips and key numbers by sport.

What is Vig?

Understanding the bookmaker's margin and how to find better lines.