Betting Calculators
Price lines accurately and never deal in fuzzy math again. Eleven free tools, from a quick odds conversion to the exact value of a half point, all live and instant.
What Is a Half Point Actually Worth?
Every other calculator here is standard betting math. This one runs on the margin model behind our alternate lines and teaser grades, fit on four seasons of results (1,138 NFL and 3,570 CFB games), so crossing a key number counts for what it really should.
Half-Point Value and Line Compare
Which of two numbers is the better bet once the price is baked in.
Read the True Price of Any Bet
Convert between formats, strip the vig to find the fair number, measure the book's hold, and check whether a bet is really plus-EV before you place it.
Odds Converter
American, decimal and implied probability from any price.
No-Vig Fair Odds
Strip the vig from both sides to find the fair price.
Hold Calculator
The book's hold across every outcome of a market, 2-way to N-way.
Expected Value
Is a bet plus-EV at your win estimate, in percent and dollars.
Arbitrage
Split a stake across books so every outcome pays the same.
Grade Your Own Bets
Score a wager against the closing line, the strongest single signal of long-term success, and see how the house edge compounds across parlay legs.
Closing Line Value
Score a bet against the closing price, de-vigged when you have both sides.
Parlay Calculator
True odds, payout and the house edge on every leg you add.
Size Every Bet the Right Way
Set your unit, size to your edge with Kelly, and decide whether, and how much, to hedge an open position.
Unit Calculator
Your unit and the 1u to 3u ladder from a bankroll and a percent.
Kelly Calculator
What fraction of the roll an edge is worth, full to quarter Kelly.
Hedge Calculator
The locking hedge and the bankroll-growth hedge for an open bet.
Want the walkthrough behind these? Read Bankroll Management and Betting 101 and the juice.
The math is handled. Now find the edges.
These tools price the bet, but you still need +EV plays to win.
For informational and entertainment purposes only. Not betting advice. Past performance does not guarantee future results. Must be 21+. Gambling problem? Call 1-800-GAMBLER.