Gambling Calculator

Odds, without the guesswork

Gambling calculators.
Understand the odds.

Free gambling calculators for odds, payouts and probability. Choose a tool, check its assumptions and see how the result is worked out.

Find your calculatorHow our tools work
  • Free to use
  • No sign-up
  • Clear explanations
Ivory and green chips beside a roulette ball.

Same odds. A clearer view.

American
+150
Decimal
2.50
Fractional
3/2
Example odds conversion

Start with the essentials

All calculators & guides

Choose by the calculation you want to make.

Search names or topics, such as poker, payout or probability.

Roulette2 tools & topics

Odds & betting10 tools & topics

Probability3 tools & topics

Casino22 tools & topics

Horse racing2 tools & topics

Poker8 tools & topics

Betting8 tools & topics

Bankroll1 tools & topics

Draws2 tools & topics

Winnings1 tools & topics

Find the calculation you need

Start with odds conversion for one fixed-odds bet. Use a dedicated tool for combinations, casino rules or draws without replacement. Each calculator states what it includes and where its assumptions stop.

Every result has a method

We separate a chance of winning from a payout and an expected value. Examples use hypothetical amounts. They explain the arithmetic without predicting outcomes or offering real-money play.

Choose a gambling calculator by calculation

For one sports bet, use the gambling odds calculator to convert the price and calculate a winning payout. For multiple selections, use the parlay odds calculator or round robin calculator.

Casino payout tools settle a stated wager. Probability tools count outcomes. Use expected value and recorded ROI to compare a probability with a payoff, and tournament prize distribution to split a fixed pool. These calculations answer different questions.

A few useful distinctions