Calculators40 calculators · free · no account
Free sports betting calculators.
40 of them. The maths behind a price, a payout and a stake — worked properly, with the formulas shown and the assumptions stated. Everything runs in your browser: nothing is sent anywhere, nothing is saved, and no account is required.
Odds & Pricing
Convert, compare and strip the margin out of a price.
- Odds ConverterConvert American, decimal and fractional odds, with the implied probability of each price.
- No-Vig CalculatorStrip the bookmaker margin out of a market to see the fair price behind it.
- Vig / Hold CalculatorHow much a sportsbook is charging on a market, as overround and as hold.
- Fair Odds CalculatorTurn a probability into the price that pays it with no margin, and back again.
- Exchange CommissionWhat an exchange price is really worth after commission is taken off the winnings.
- Odds ComparisonThe same selection across up to ten books, with the best price flagged.
Bet Calculators
Work out what a wager returns before you place it.
- Bet Payout CalculatorProfit, total return and the win rate a price needs to break even.
- Parlay CalculatorCombine up to twenty legs, toggle any of them off, and price the ticket.
- Hedge CalculatorWhat to lay on the other side, and what each outcome pays you.
- Arbitrage CalculatorWhether a set of prices is arbable, and how to split the stake.
- Dutching CalculatorSplit a stake across selections so every winner returns the same.
- Round Robin CalculatorEvery combination of your selections, priced and totalled.
- Parlay vs StraightThe same selections combined against the same selections separately.
- Middle CalculatorThe window where both sides of a spread or total can win.
- Futures Hedge CalculatorLock a futures position in, at equal payout or a chosen profit floor.
Value & Analytics
Whether a price is worth taking, and by how much.
- Expected Value (EV) CalculatorWhat a bet is worth on average, given a price and your own probability.
- Betting Edge CalculatorYour edge in probability points, and why that is not the same as EV.
- Break-Even Win RateThe win rate a price needs before it makes you anything.
- Closing Line Value CalculatorWhether you beat the closing price, and by how much.
- Line Shopping ValueWhat a better price is worth once, and over a season.
- Cash-Out ValueWhat a cash-out offer is worth against what the position is worth.
- Push-Adjusted EVEV on a market where a push is a real possibility.
Bankroll
Stake sizing, risk and survival.
- Kelly Criterion CalculatorThe stake your edge justifies, at full Kelly or a safer fraction of it.
- Bankroll / Unit CalculatorWhat a unit is worth, and what bankroll a unit implies.
- Bankroll SimulatorTen thousand seasons of the same edge, and where they end up.
- Risk of RuinThe chance a bankroll does not survive the variance.
Performance
What a record actually tells you — and what it does not.
- Betting ROI CalculatorReturn on everything you put through, not just the bets that won.
- Profit / Units CalculatorUnits won or lost, converted into money and a bankroll return.
- Betting Record CalculatorWin rate, ROI and profit per wager from a raw record, with pushes handled properly.
- Win Rate ConfidenceThe range your true win rate plausibly sits in, given the sample.
- Sample Size CalculatorHow many bets it takes before a result means anything.
- Expected Profit over N BetsWhere an edge lands over a season, and how wide the spread is.
- Streak ProbabilityThe losing runs a winning bettor should still expect to hit.
- Maximum DrawdownThe worst stretch in a record, in money and in duration.
Promos
What a bonus is really worth in cash.
Advanced Markets
Asian lines, exchanges, teasers and pushes.
Which calculator do you need?
- I want to know what a bet pays before I place it.
- Start with the bet payout calculator for a single wager, or the parlay calculator if you are combining selections. If the price is quoted in a format you do not read fluently, the odds converter handles American, decimal and fractional together.
- I want to know whether a price is actually any good.
- That is what expected value answers, given your own estimate of the chance. The break-even calculator tells you the win rate a price demands, and the no-vig calculatorstrips the bookmaker’s margin out of a market so you can see what it really thinks.
- I want to know how much to stake.
- The bankroll calculator turns a bankroll into a unit; the Kelly criterion calculator sizes a bet from your edge. Before trusting either, the risk of ruin calculator shows what your stake size does to the chance of going broke.
- I want to lock in or protect a position.
- Use the hedge calculator for a two-way market, the futures hedge calculator for a live season-long ticket, and the cash-out calculatorto check whether the book’s buy-back offer is worth taking.
- I want to judge a record — mine or someone else’s.
- The betting record calculator turns raw counts into win rate and ROI. Then be sceptical about it properly: the win rate confidence calculator puts a range around the number, and the sample size calculator says how many bets it would take to mean anything.
For informational and analytical purposes only. These tools do not predict outcomes and do not recommend wagers. Implied probabilities taken from a price include the bookmaker’s margin and are not a true likelihood of any result.