Odds conversion, devig & hold, Kelly staking, parlays, hedging and free-bet value — all computed live in your browser.
Odds Converter
Type any one format; the rest update.
No-Vig / Devig + Hold
Enter both sides' American odds (add a 3rd for 3-way). Get the fair no-vig prices and the book's hold.
Kelly Stake
Your true win % vs the price offered → optimal stake.
Parlay Calculator
Add each leg's American odds. Shows combined price + payout and the true no-vig fair odds.
Hedge Calculator
Your open bet + the current opposite price → how much to lay to lock an equal guaranteed result.
Free-Bet Conversion
A free bet returns winnings only (stake not returned). Shows its cash value at a given price.
For information only. “Hold” is the book’s theoretical margin; “no-vig” prices remove it via proportional devig. Kelly assumes your win % is accurate — fractional Kelly is safer.