Free Betting Calculators That Show You the Fair Price
36 professional-grade, 100% free sports betting calculators built for quantitative bettors. Find value, calculate EV, size stakes optimally, and compound your edge — no signup, no paywall.
Explore by category
Pick a discipline — the tools below filter to match
EV & ROI
Calculate the expected value (+EV) and long-term yield of your bets.
Converter
Translate American, Decimal, Fractional odds formats instantly.
Probability
Convert odds to implied probability percentages to find expected holds.
Bookie Margin
Expose the secret commission (overround) charged by sportsbooks on a line.
Fair No-Vig Odds
Strip bookmaker commissions to reveal true probabilities and fair odds.
Value Finder
Expose lines where offered odds are higher than fair model probability.
CLV
Compare your bet price to the closing line to evaluate execution quality.
Kelly
Determine the mathematically optimal stake size based on your edge.
Bankroll
Track wagers, monitor yield (ROI), and analyze your portfolio metrics.
Risk of Ruin
Calculate the exact mathematical probability of complete bankroll ruin.
Staking Sim
Run stress-tests comparing flat wagers against Kelly sizing models.
Tax Calc
Track net tax liabilities across regional tax rules and payouts.
Arbitrage
Identify and calculate guaranteed profit opportunities across sportsbooks.
Hedge Bet
Lock in profits or minimize losses by hedging open positions.
Dutching
Split a total stake across multiple selections for equal returns.
Lay Bet
Calculate exchange liability and optimize matched betting positions.
Free Bet
Convert free bets and bonuses into guaranteed cash using opposite hedging.
Each Way
Evaluate win/place terms and ROI for each-way wagers.
Parlay/Acca
Calculate combined odds, payouts, and true probabilities for multi-leg slips.
Acca Builder
Simulate and optimize stake distribution across multi-bet options.
Round Robin
Compute combos of systems and round robins from a selection list.
Lucky Bets
Calculate Patent, Lucky 15, Lucky 31, and Lucky 63 payouts.
SGP Analyzer
Analyze same-game parlays and evaluate correlated outcomes.
Poisson
Generate score expectations and outcomes using Poisson team distributions.
xG Edge
Analyze soccer team metrics using expected goals (xG) calculations.
BTTS/Overs
Calculate Both Teams to Score and Over/Under goal probabilities.
Asian Handicap
Map Draw No Bet, Asian Handicap, and Double Chance lines.
Handicap/DNB
Convert 1X2 odds into Draw No Bet and Double Chance equivalents.
HT/FT
Predict half-time and full-time combination probabilities.
Corners
Predict match corner kicks based on team offensive ratings.
Goalscorer
Predict anytime, first, and multiple goalscorer probabilities.
Clean Sheet
Predict clean sheet likelihood based on defensive ratings.
Player Props
Analyze player prop lines against projected statistical spreads.
Cricket
Required run rate, net run rate and session-runs math for cricket.
Cricket Betting Calculator
Strip the vig from T20, ODI and Test match odds, model innings totals, read live win probability and size Kelly stakes.
World Cup 2026
Match and tournament simulation with Poisson-based team strengths.
Try It Right Now
The three most-used calculators, live on this page — no signup. Open the full versions for worked examples and theory.
Kelly Criterion
Expected Value (EV)
Arbitrage
Popular Guides
Math-first explainers that show you where the edge lives — and where the market has already priced it out.
Expected Value Explained
EV from first principles with three worked examples.
Kelly Criterion
Optimal fraction of bankroll per +EV bet.
Arbitrage Complete Guide
Find, stake, and execute risk-free splits.
Closing Line Value
Why CLV predicts long-term profit better than ROI.
Odds Formats + Converter
Decimal, American, Fractional — how each encodes probability.
Line Shopping
Why -110 → -105 can double long-run ROI.
Vig & Overround Explained
Proportional, power, Shin — picking a de-vig model.
Monte Carlo Simulation
Simulate strategies across thousands of bankrolls.
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