Betting Calculators
Break down the numbers behind any line. Free, no login needed.
No-Vig Calculator
Enter both sides of a 2-way market (American like -110 or decimal like 1.91). The book's margin is removed proportionally to give each side's fair chance and fair odds.
Use the sharpest book you can (Pinnacle, Circa or an exchange like Novig) for the closest fair price. Any book paying more than the fair odds on a side is a +EV bet.
Odds Converter
Type odds in any box and the others update. Add a stake to see the payout.
Implied probability is the win chance the odds suggest, including the book's margin. Need a printable chart? Full odds converter page →
Hold % Calculator
Enter every outcome of one market (2-way, or 3-way for soccer and other markets with a draw). Hold is the share of all money bet the book expects to keep.
-110 / -110 holds 4.55%. Sharp books usually hold 2–3% on main lines; player props and niche markets often hold 6–10% or more.
Parlay Calculator
Add each leg's odds (American or decimal). Every leg has to win for the parlay to pay.
The implied win % multiplies each leg's implied chance, so it includes every leg's vig. Legs from the same game are usually linked, and many books price those (same-game parlays) differently.
EV Calculator
Enter the odds you can bet and the fair price, either as no-vig odds (from the No-Vig Calculator) or as your own win %.
EV is the average profit per bet over the long run, not what happens on any one bet. Kelly shows the full-Kelly share of your bankroll; most bettors use a quarter or half of it to keep swings small.
Odds to Probability Chart
Implied win chance for every American line from -1000 to +1000. Type a line to jump to it.
| American | Decimal | Fractional | Implied % | Break-even per $100 |
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Implied % includes the book's margin. To find a fair chance, remove the vig from both sides with the No-Vig Calculator.
Want these numbers done for you on every line? ChalkEdge's EV+ tab compares every book against the sharp fair price automatically. Start a 7-day free trial →