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Free betting calculators

Find payouts, convert odds, and estimate profit or loss. Choose from 16 free tools, each with instant results, simple instructions, and an example you can follow.

Multi-leg bets

Bet value and bankroll

Hedging and promotions

Odds and market pricing

Probability models

Start with the basics

Betting terms explained

Learn what odds, expected value, and sportsbook margin mean.

What are American, decimal, and fractional odds?

They are three ways to write the same price. American odds use numbers such as +150 or -110. Decimal odds show the total return per $1 staked. Fractional odds show profit compared with your stake. +150, 2.50, and 3/2 all mean the same thing.

What is implied probability?

It is the win chance needed to break even at given odds, before costs. Divide 1 by the decimal odds to find it. At -110, you need to win about 52.4% of bets to break even.

What are vig, juice, and hold?

Vig and juice mean the margin built into sportsbook odds. Overround is how far the implied win chances total above 100%. Theoretical hold adjusts that margin for equal payouts. Actual hold is the share of stakes the sportsbook keeps after results.

What are no-vig fair odds?

These are estimated odds after removing the sportsbook margin. The calculator adjusts all outcomes so their win chances add up to 100%. The result is a market estimate, not a proven win chance.

What is expected value (EV)?

EV is the average profit or loss from the same bet over many tries. Positive EV means an average profit if your win estimate is correct. It does not guarantee that any one bet wins.

What is the Kelly Criterion?

Kelly is a formula that uses odds and your win estimate to suggest a stake. It uses your bankroll, the money set aside for betting. Quarter Kelly uses one quarter of the full Kelly stake.

What is the difference between profit and total payout?

Profit is what you win after subtracting your stake. Total payout includes the returned stake. A winning $100 bet at +300 earns $300 profit and pays back $400 in total.

Which calculator should I use?

Find the tool that matches the question you want to answer.

What is a parlay, and when should I use the Parlay Calculator?

A parlay combines several picks into one bet. Every pick must win. Use the calculator to find the combined odds, profit, and total payout for 2–15 picks.

What is a round robin, and why use that calculator?

A round robin makes several smaller parlays from a set of picks. Use it to see how many bets you will place, your total stake, and the possible payouts. You can also try different win, loss, and push results.

When should I use the PrizePicks EV Calculator?

Use it to compare Power and Flex entries. Enter each pick’s win chance, your stake, and the payouts from your entry. The result estimates average profit or loss across many similar entries.

When should I use the Expected Value Calculator?

Use it when you know the offered odds and have your own estimate of the win chance. It shows the average profit or loss for your stake if that estimate is correct.

When should I use the Kelly Criterion Calculator?

Use it to explore stake sizes from your odds, win estimate, and bankroll. Compare full Kelly with smaller shares to see how much money each puts at risk.

When should I use the Arbitrage & Hedge Calculator?

Use it to balance bets on two opposite results. It shows the profit or cost if both bets are accepted at your prices. The bets must cover every result and use matching settlement rules.

When should I use the Bonus Bet Conversion Calculator?

Use it to estimate the cash value of a bonus bet after betting real money on the opposite result. Check how much cash the hedge needs and whether the bonus stake is returned on a win.

When should I use the Odds Converter?

Use it to switch between American, decimal, and fractional odds. Enter a stake to see profit and total payout as well.

When should I use the Implied Probability Calculator?

Use it to find the win chance needed to break even at given odds. You can compare that percentage with your own estimate.

When should I use the No-Vig Fair Odds Calculator?

Use it to estimate odds with the sportsbook margin removed. Enter every outcome in a two-way or three-way market, including a draw when needed.

When should I use the Hold or Vig Calculator?

Use Hold to compare the margin across two or three market outcomes. Use Vig to estimate that margin’s dollar cost for a selected bet. Actual sportsbook hold also depends on stakes and results.

When should I use the Prediction Markets Converter?

Use it to convert a contract price in cents into betting odds, or go the other way. Enter the contract count and fees to see the cash needed and possible profit.

When should I use the Half Point Calculator?

Use it to compare the fair price before and after a half-point move. You supply the chance of landing on each affected whole number. The tool does not load historical scoring data.

When should I use the Point Spread Calculator?

Use it to explore a team’s chance of winning outright from its spread. The starting values are examples you can edit. They are not fitted to historical results or a forecast for a specific game.

When should I use the Poisson Calculator?

Use it to estimate counts, such as goals, from an expected average. It shows the chance of exactly, at least, or at most a chosen count. The model assumes independent events at a steady average rate.

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