Survive first. Win second.
How sizing works
Most bettors do not lose to bad plays, they lose to bad sizing. These four calculators are the survival math: how much can be in play at once, how to cover an open parlay, what a price really says, and what the numbers convert to. All of it runs on your device and all of it is free, because a solvent bettor is a subscriber next month.
Most bettors do not lose to bad plays, they lose to bad sizing. These four calculators are the survival math: how much can be in play at once, how to cover an open parlay, what a price really says, and what the numbers convert to. All of it runs on your device and all of it is free, because a solvent bettor is a subscriber next month.
One leg left? Cover it.
Every leg of your parlay has hit except the last one. Bet the opposite side of that final leg for the amount below and you profit the same number no matter which way it lands. This stake sits outside the exposure cap because the outcome risk is closed. Does not apply where a draw can void both sides (soccer moneylines).
What the price is really saying
Every American price is a probability with the book's cut baked in. A +1000 parlay is the book telling you it fails 9 times in 10. Add the other side's price and we strip the vig to show the fair number, which is the one that matters. Most sites skip that step.
American, decimal, dollars
How this composes with Kelly
Every card on the board carries a quarter-Kelly stake in units. Kelly answers "how much on this card," the 20-80-20 cap answers "how much on tonight, total." Run both: size each play by its Kelly chip, and stop firing when your open risk reaches the cap. The nightly slate is built to fit inside both limits at the default 1% unit.