Calculators

Betting calculators

Odds, hold, expected value, bet sizing and simulation tools. Everything runs in your browser.

Conversion

Odds ConverterConvert between American, decimal and fractional odds. Hold CalculatorSee the hold on a two-sided market and the no-vig fair odds for each side. Parlay CalculatorPayout, combined odds and implied probability for a 2 to 10 leg parlay.

Analysis

Sharp ImpliedNo-vig win probabilities from a moneyline, and implied scores from a spread and total. Devig CalculatorRemove the vig five ways: equal margin, proportional, Shin, odds ratio and logarithmic. Expected Value (EV)The expected value of a bet, given your price and a fair price. Closing Line ValueHow much your price beat the closing price, in probability points and cents. Bayesian OddsCombine a price-implied probability with your own estimate, weighted by how much you trust each. Regression to the MeanShrink a small-sample stat toward a baseline to estimate true talent. Alternate Line PricerFair odds for every alternate spread or total from one main line and its price. Middle FinderProbability and expected value of landing a middle between two positions. Teaser EVCover probabilities, fair odds and expected value for a teaser.

Sizing

Kelly CriterionBet size from your edge, the price and your bankroll. Hedge CalculatorThe hedge stake that equalizes outcomes or gets your stake back. Risk of RuinSimulated chance of losing a bankroll, given edge, price and bet size.

Odds range and variance

Breakeven LadderBreak-even win rate across a range of prices, and the sample needed to tell an edge from noise. CLV TranslatorWhat a move of a given number of cents is worth in probability points at each price. Bet Mix BuilderBlended break-even and season standard deviation for a mix of prices. Season SimulatorSimulated range of season results for a bet mix. Bankroll Path SimulatorSimulated bankroll paths with edge and price drawn from ranges, for flat, Kelly or % staking.

Comparison

Arbitrage CalculatorCheck 2 or 3 prices across books for an arbitrage, and split the stake. Vig ComparisonCompare several books on the same market to find the lowest hold. Multi-Book ConsensusBlend several books into one no-vig fair price, then check a price for EV and Kelly. Better LineCompare two lines at different prices to see which is the better bet.

Simulation

Player Prop SimulatorSimulate a player stat to get over/under probabilities and fair odds. Trend SimulatorBootstrap recent game logs into an over/under probability and EV. Game Probability VisualizerMargin and score distributions for a game from its spread and total. Poisson Match PredictorScoreline, moneyline, spread and total probabilities from two expected scores. Negative Binomial Match PredictorLike the Poisson predictor, with extra spread in scoring for blowout-prone matchups.

For information and education only, not betting advice. Results are only as good as the numbers you enter. Must be 21+ (18+ where permitted). Gambling problem? Call or text 1-800-GAMBLER.