Free tools
Sports betting calculators
19 free calculators for checking a price before you bet: payouts, parlays, odds formats, implied chances and the sportsbook's margin, plus value and staking tools (EV, Kelly, hedging, arbitrage, bankroll, CLV) and tools built for football, basketball, tennis, UFC and volleyball markets. Results update as you type.
Odds and payouts
- Odds converterAmerican, decimal, fractional, Hong Kong, Indonesian and Malay odds, converted as you type.
- Betting payout calculatorProfit, total payout and implied probability for any stake and price.
- Parlay calculatorCombine 2 to 15 legs: parlay odds, payout and the chance every leg wins.
- Implied probability calculatorThe win chance a price implies, its break even rate, and odds from a probability.
- No vig calculatorStrip the bookmaker's margin from a 2-way or 3-way market to get fair odds.
- Round robin calculatorEvery parlay in a round robin by 2s, 3s or more: total stake, best case and any result.
- Bonus bet calculatorWhat a free or bonus bet is worth, and how much cash a hedge locks in.
Football (soccer)
Football betting guideBasketball
Basketball betting guideTennis
Tennis betting guideUFC and MMA
UFC betting guideVolleyball
Volleyball betting guideValue, staking and hedging
- Expected value (EV) calculatorExpected profit, edge and break even rate from a price and your own win estimate.
- Kelly criterion calculatorFull, half and quarter Kelly stakes from your bankroll, the price and your estimate.
- Hedge calculatorHow much to bet on the other side to lock in profit or cut a loss, with both outcomes.
- Arbitrage calculatorCheck whether prices at two or three sportsbooks leave an arbitrage, and how to split stakes.
- Bankroll calculatorUnit size from your bankroll and risk level, stakes in units, and what a losing run does.
- Closing line value (CLV) calculatorHow the price you took compares with the closing line, with or without the vig.
Which calculator do I need?
| What does this bet pay? | Betting payout calculator |
| What is +150 in decimal or fractional odds? | Odds converter |
| What chance of winning does this price imply? | Implied probability calculator |
| How much margin is the sportsbook taking? | No vig calculator |
| What would my parlay pay? | Parlay calculator |
| Is this double chance or draw no bet price fair? | Double chance & draw no bet calculator |
| What score do the spread and total imply? | Point spread & total calculator |
| What are the chances of a 2-0 or 2-1 tennis win? | Tennis set betting calculator |
| Will this fight go the distance? | UFC method of victory calculator |
| What are the chances of a 3-0 or 3-2 volleyball result? | Volleyball set betting calculator |
| Is this volleyball total points line fair? | Volleyball points calculator |
| Is this bet worth it at my own win estimate? | Expected value (EV) calculator |
| How much of my bankroll should I stake? | Kelly criterion calculator |
| How big should a betting unit be? | Bankroll calculator |
| How much should I hedge to lock in a result? | Hedge calculator |
| Do these prices at two sportsbooks leave an arbitrage? | Arbitrage calculator |
| What does a round robin cost and pay? | Round robin calculator |
| What is my bonus bet worth? | Bonus bet calculator |
| Did I beat the closing line? | Closing line value (CLV) calculator |
Common questions
Are these calculators free?
Yes. They run in your browser, need no account and store nothing you type.
Do the calculators predict results?
No. They do arithmetic on the prices you enter: payouts, implied chances and fair odds. Probabilities you enter yourself are assumptions, not forecasts.
Which odds formats are supported?
American, decimal and fractional in every calculator, and Hong Kong, Indonesian and Malay odds in the odds converter and implied probability calculator.
Betting involves risk. Calculators show what prices imply, not what will happen. Set a budget before you start, never chase losses, and if betting stops being fun, call or text 1-800-GAMBLER for free, confidential help.
Casino tools (poker odds, blackjack strategy, trip costs) are on the casino tools page.