Betting, DFS & Casino Calculators
Free calculators for prediction market traders, DFS pick'em players, sports bettors, and casino players. Every tool runs entirely in your browser with no account required.
Prediction Markets & Sports Betting
Odds Converter · Convert between American, decimal, fractional, implied probability, and prediction market cents. → Parlay Calculator · Calculate combined odds and payouts for multi-leg parlays across any odds format. → EV Calculator · Find expected value by comparing your estimated probability against the market price. → Fee Calculator · Compare trading fees across Kalshi, Polymarket, Crypto.com, FanDuel, and DraftKings. → Vig Calculator · Calculate the vig (juice) built into a two-way or multi-way market and extract fair odds. → Hedge Calculator · Find the optimal hedge bet size to lock in profit or minimize loss across outcomes. → Arbitrage Calculator · Detect and size arbitrage opportunities across platforms for guaranteed profit. → Kelly Calculator · Determine optimal position size using the Kelly Criterion based on your edge and bankroll. → P&L Calculator · Track profit and loss across positions with support for partial exits and fee adjustments. → Break-Even Calculator · Find the exact probability needed to break even at a given price, including platform fees. → Bankroll Simulator · Simulate bankroll growth over hundreds of bets using Monte Carlo methods and Kelly sizing. → Odds Translator · Paste odds in any format and get a plain-English explanation of what they mean. → Fee-Adjusted Returns · See your real return after all platform fees, deposits, and withdrawals are factored in. →
Live Arb Scanner · Real-time scanner that surfaces cross-platform arbitrage opportunities from live data. Soon
DFS Pick'em
Pick'em Payout Calculator · Calculate exact payouts for PrizePicks, Underdog, Pick6, Sleeper, and FanDuel entries by pick count and entry type. → Flex vs Power Play · Compare Flex vs Power Play, Insured vs Standard. Find the crossover hit rate where all-or-nothing beats insurance. → Pick'em Platform Comparison · Side-by-side comparison of payouts, features, and availability across all major pick'em platforms. → Pick'em EV Calculator · Enter sportsbook odds for each pick to calculate expected value against the platform's payout multiplier. → Special Modes Calculator · Evaluate PrizePicks Demons, Goblins, and Underdog Scorcher entries. Compare boosted multipliers against adjusted hit rates. → Entry Size Optimizer · Find the optimal number of picks and entry type for your hit rate. Ranks every configuration by expected value. → Pick'em Bankroll Calculator · Kelly Criterion sizing for pick'em entries. Get recommended entry size, daily budget, and weekly EV projections. →
DFS Classic
Fantasy Scoring Calculator · Calculate exact fantasy points for any stat line across DraftKings, FanDuel, and Yahoo. NFL, NBA, and MLB. → DFS Contest EV Calculator · Calculate expected value of any DFS contest. See rake impact, break-even cash rate, and ROI projections. → DFS Bankroll Calculator · Kelly Criterion sizing for DFS. Get nightly budget, contest-type allocations, and long-term EV projections. → DFS Salary Allocator · Plan roster construction by allocating salary cap across positions. Star vs punt analysis for DK, FD, Yahoo. → DFS Correlation Tool · Interactive correlation matrix for stacking. Position-pair correlations and recommended stack configs for NFL, NBA, MLB. → DFS Variance Simulator · Monte Carlo simulation showing bankroll trajectories. See probability of ruin, drawdowns, and confidence intervals. →
Online Casino
Casino Game Comparison · Compare house edge, expected loss, and win probability across blackjack, craps, roulette, baccarat, video poker, and slots. → Expected Loss Calculator · Calculate your expected gambling cost per session with confidence intervals and entertainment cost comparisons. → Craps Calculator · Interactive craps calculator with house edge, true odds, bet builder, and odds maximizer for every bet type. → Blackjack Strategy Calculator · Generate color-coded basic strategy charts for any rule set. Practice mode, house edge calculator, and rule impact breakdown. → Wagering Requirement Calculator · Calculate the true value of casino bonuses after game contribution weighting, house edge, and time to clear. → Responsible Gambling Toolkit · Budget calculator, PGSI self-assessment, session planner with stop-loss and win goals, and help resources. → Bonus Value Calculator · Estimate the real cash value of a casino bonus after wagering, game contribution, house edge, and max cashout. Shows expected value, playthrough loss, and +EV/-EV verdict. → RTP & House Edge Calculator · Convert RTP to house edge and expected loss per hour, then run a 10,000-session Monte Carlo simulator for the bankroll-outcome distribution, bust probability, and percentile results. →
Lottery
Lottery Payout Calculator · Calculate after-tax take-home for Powerball and Mega Millions. Federal and state tax brackets, cash vs annuity. → Lottery EV Calculator · Calculate expected value per ticket. See breakeven jackpot, co-winner adjustment, and tier-by-tier EV breakdown. → Lottery Odds Calculator · Exact probabilities for every prize tier. Powerball, Mega Millions, or any custom lottery format. → Annuity vs Lump Sum · Compare cash option vs annuity with 30-year payment schedules, investment projections, and tax analysis. → Number Analyzer · Frequency heatmaps, hot/cold numbers, and check your lucky numbers against every historical draw. →
Poker
Poker Equity Calculator · Texas Hold’em Monte Carlo equity for hand-vs-hand and hand-vs-range spots, with optional flop, turn, and river. → Poker ICM Calculator · Convert tournament chip stacks and payouts into dollar equity, and compare an ICM deal against an even chip chop. → Poker Variance Simulator · Project expected profit, confidence intervals, worst downswings, and risk of ruin from your win rate, standard deviation, and bankroll. →
Curious how we rate the venues behind these numbers? See our OR Score methodology — a transparent, data-only rating for prediction-market exchanges.