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Betting Calculators

Free tools for parlay payouts, EV, Kelly sizing, and more.

Odds Converter

Edit any field. American, decimal, fractional, and implied probability all update instantly.

Edit any field. The others update instantly.

How it works

American odds represent profit per $100 wagered. -110 means you bet $110 to win $100. +150 means you bet $100 to win $150. Decimal odds include your stake in the return: 2.5 means you get $2.50 back for every $1 bet.

Fractional odds are common in UK betting. 3/2 means win $3 for every $2 wagered. Implied probability is what the line says about the chances of that outcome, including the book's vig.