Bet Sports Calculator

Formatting only. This does not change the calculation.
American (+150, -110), decimal (2.50), fractional (3/2) or a probability (40%).
Leave on automatic unless a bare number is ambiguous.
For arbitrage this is the total to spread across all outcomes.
Comma-separated. Parlay legs, arbitrage outcomes or the whole market for a no-vig calculation.
Kelly staking needs your own estimate, not the bookmaker's implied probability.
Multiply full Kelly by this. Half Kelly (0.5) keeps most of the growth with far less variance.
Profit if the bet wins
90.909091
Betting Odds Calculator
Decimal odds
1.909091
American / moneyline odds
-110
Fractional odds
10/11
Implied probability
52.380952 %
Hong Kong odds
0.909091
Indonesian odds
-1.1
Malay odds
0.909091
Total return (stake plus profit)
190.909091
Break-even win probability
52.380952 %
Worked out from Kelly, J.L. Jr (1956), "A New Interpretation of Information Rate", Bell System Technical Journal 35(4), 917-926 and 3 other sources.
This is an arithmetic tool, not betting advice. Bookmaker prices already carry a margin, so the long-run expected value of a bet at posted odds is negative unless you genuinely have an edge. Gamble only what you can afford to lose.

How this is worked out

2 steps
  1. Decimal price = 1.90909091, i.e. -110 American, 10/11 fractional, 52.380952% implied.
  2. A stake of 100 returns 190.909091 in total, a profit of 90.909091.

Results are general information, not financial, tax, legal, medical or engineering advice.