Free betting calculators

Quick tools every bettor needs. No sign-up.

Odds converter

Type any one and see the others.

American

Decimal

Implied chance %

Enter each leg's American odds (up to 8). Add your stake.

Stake $

Combined odds—

Payout—

Profit if it hits—

Implied chance all hit—

Remove the sportsbook's margin from a two-sided line to see each side's true chance.

Side A odds

Side B odds

Side A fair chance—

Side B fair chance—

Sportsbook margin—

How much of your bankroll a bet is worth, given your estimate of its true chance. Quarter-Kelly is a common cautious choice.

Bankroll $

Odds (American)

Your win chance %

Edge—

Full Kelly—

Quarter Kelly (suggested)—

Already have a bet that is winning? Enter it and today's odds on the other side to see how much to bet there to lock in the same profit either way.

Original stake $

Original odds

Odds on the other side now

Bet this much on the other side—

Profit either way—

If original wins, without hedge—