Betting Calculators That Just Work
Fast, free tools for odds, accumulators, system bets, Kelly staking and value — no sign-up, no clutter.
Odds & Conversion Tools
Betting Odds Calculator
Enter any American odds and a stake to see the payout, profit and the chance the price implies - a plain-English returns calculator for any bet.
Implied Probability Calculator
Turn American or decimal odds into the win probability the price implies, and see the sportsbook's vig on a two-way market.
Moneyline Calculator
Work out the payout and profit on a moneyline bet from American odds, for any stake in dollars.
No-Vig (Fair Odds) Calculator
Strip the sportsbook's margin out of a market to reveal the fair, no-vig odds and the true probability behind each price, in American odds.
Odds Calculator
Convert American, decimal and fractional odds, and turn any price into a payout and an implied win probability, in dollars.
Point Spread Calculator
Work out the payout and profit on a point spread bet from American odds, and see what it costs to lay -110 juice, in dollars.
Single & Multiple Bet Tools
Accumulator Calculator
Combine four or more picks into one accumulator and see the combined odds, payout and profit from American odds, in dollars.
Double Bet Calculator
Work out the combined odds, payout and profit on a double - a two-pick parlay where both must win - from American odds, in dollars.
Parlay Calculator
Work out the combined odds, payout and profit on a multi-leg parlay from American odds, in dollars.
Single Bet Calculator
Work out the payout and profit on a single bet - one pick, one wager - from American odds, for any stake in dollars.
Treble Calculator
Work out the combined odds, payout and profit on a treble - a three-pick parlay where all three must win - from American odds, in dollars.
System Bet Tools
Alphabet Calculator
Work out the returns on an Alphabet: twenty-six bets across six picks, made of two Patents, a Yankee and a six-fold, in dollars.
Canadian (Super Yankee) Calculator
Work out the returns on a Canadian, also called a Super Yankee: twenty-six bets across five moneyline picks.
Double Stakes About (DSA) Calculator
Work out the return on a Double Stakes About - two any-to-come bets that reinvest double the stake on the other pick - from American odds, in dollars.
Flag Calculator
Work out the returns on a Flag: a Yankee plus six up-and-down pairs, twenty-three bets on four moneyline picks.
Goliath Calculator
Work out the returns on a Goliath: two hundred and forty-seven bets across eight moneyline picks.
Goliath Flag Calculator
Work out the returns on a Goliath Flag: a Goliath plus twenty-eight up-and-down pairs, three hundred and three bets.
Heinz Calculator
Work out the returns on a Heinz: fifty-seven bets across six moneyline picks, with no singles.
Heinz Flag Calculator
Work out the returns on a Heinz Flag: a Heinz plus fifteen up-and-down pairs, eighty-seven bets on six moneyline picks.
Lucky 15 Calculator
Work out the returns on a Lucky 15: fifteen bets across four moneyline picks, singles included.
Lucky 31 Calculator
Work out the returns on a Lucky 31: thirty-one bets across five moneyline picks, singles included.
Lucky 63 Calculator
Work out the returns on a Lucky 63: sixty-three bets across six moneyline picks, singles included.
Patent Calculator
Work out the returns on a Patent: seven bets across three moneyline picks, singles included.
Round Robin Calculator
Work out the returns on a Round Robin: a Trixie plus three up-and-down pairs, ten bets on three moneyline picks.
Single Stakes About (SSA) Calculator
Work out the return on a Single Stakes About - two any-to-come bets that reinvest one pick's winnings on the other - from American odds, in dollars.
Super Flag Calculator
Work out the returns on a Super Flag: a Canadian plus ten up-and-down pairs, forty-six bets on five moneyline picks.
Super Heinz Calculator
Work out the returns on a Super Heinz: one hundred and twenty bets across seven moneyline picks.
Super Heinz Flag Calculator
Work out the returns on a Super Heinz Flag: a Super Heinz plus twenty-one up-and-down pairs, one hundred and sixty-two bets.
Trixie Calculator
Work out the returns on a Trixie: four bets across three moneyline picks, with no singles.
Union Jack Patent Calculator
Work out the returns on a Union Jack Patent: nine picks in a 3x3 grid with each of the eight lines played as a Patent.
Union Jack Round Robin Calculator
Work out the returns on a Union Jack Round Robin: nine picks in a 3x3 grid with each line played as a Round Robin.
Union Jack Trebles Calculator
Work out the returns on a Union Jack Trebles: nine moneyline picks in a 3x3 grid played as eight three-pick parlays.
Union Jack Trixie Calculator
Work out the returns on a Union Jack Trixie: nine picks in a 3x3 grid with each of the eight lines played as a Trixie.
Yankee Calculator
Work out the returns on a Yankee: eleven bets across four moneyline picks, with no singles.
Value & Strategy Tools
Arbitrage Calculator
Split a stake across two sportsbooks on opposite sides of a game to lock in a guaranteed profit whichever way it lands, in dollars.
Betting ROI Calculator
Work out your betting return on investment - profit as a percentage of everything you staked - to measure how well your bankroll is performing, in dollars.
Bookmaker Margin Calculator
Compare how much margin different sportsbooks build into the same market, from their American odds, to find the sharpest prices.
Buying Half Points Calculator
See what buying a half point costs - how much profit you give up when you move a spread or total in your favor by moving the price, in dollars.
Closing Line Value (CLV) Calculator
Measure how much you beat the closing line by, comparing the American odds you took with the price at kickoff, as a percentage.
Dutching Calculator
Split a stake across two or more selections in one market so every winner returns the same amount, worked from American odds in dollars.
Expected Value (EV) Calculator
Work out the expected value of a bet from your true win probability and the American odds, to see if a price is a long-run winner.
Hold Percentage Calculator
Measure a sportsbook's hold - the margin baked into a market - by adding the implied probabilities of every outcome from their American odds.
Kelly Criterion Calculator
Find the mathematically optimal stake for a bet from your edge and the American odds, sized as a percentage of your bankroll.
Strike Rate Calculator
Find the break-even strike rate any price demands - the share of bets you must win at given American odds just to stay even, as a percentage.
Surebet Calculator
Check whether two odds form a surebet and get the exact stake on each side to guarantee the same profit whichever result lands, in dollars.
Win-Loss Record Calculator
Turn a win-loss record into a win percentage and a net profit in units, and see the break-even rate you need at -110, in dollars.
Winning & Losing Streak Calculator
Work out the probability of a run of wins or losses from your win rate, so you can size a bankroll that survives the cold spells, in dollars.
Hedge & Cover Tools
Each-Way Calculator
Work out the return on an each-way bet - the win part and the place part - from American odds and the place terms, in dollars.
Hedge Bet Calculator
Work out the hedge stake that locks in a guaranteed profit on a winning ticket by betting the other side, from American odds, in dollars.
Middle Bet Calculator
See the cost and the jackpot on a middle - betting both sides of a moved line to win both bets if the result lands in the gap, in dollars.
Reverse Bet Calculator
Work out the profit on a reverse bet - two if-bets in opposite orders that limit risk when one pick loses - from American odds, in dollars.
Specialty Tools
Asian Handicap Calculator
Work out the return on an Asian handicap bet, including split quarter lines that halve your stake, from American odds, in dollars.
Bonus Bet Calculator
Work out what a sportsbook bonus bet is really worth - the profit if it wins and how much cash you can lock in - from American odds, in dollars.
Forecast (Exacta) Calculator
Work out the return on a forecast - picking first and second in the right order, the US exacta - from the two runners' odds, in dollars.
Lay Bet Calculator
Work out the liability and profit on a lay bet - betting on an outcome NOT to happen on an exchange - from American odds, in dollars.
Matched Betting Calculator
Turn a sportsbook free bet into locked cash by laying it off on an exchange - work out the lay stake, liability and guaranteed profit in dollars.
Over/Under (Totals) Calculator
Work out the payout and profit on an over/under totals bet from American odds, with push handling, in dollars.
Poisson Betting Calculator
Turn each team's expected goals into score and match-outcome probabilities using the Poisson distribution, to compare against the odds.
Teaser Calculator
Work out the payout on a teaser - a parlay where you move the spread or total in your favor across every leg at reduced odds, in dollars.
Tricast (Trifecta) Calculator
Work out the return on a tricast - picking first, second and third in the right order, the US trifecta - from three runners' odds, in dollars.
Betting Glossary
Action
Action is any wager you have riding on an outcome, and the status that determines whether a bet counts, pays, or gets voided.
Against the Spread (ATS)
Against the spread (ATS) measures a bettor's record on point-spread wagers rather than straight-up wins and losses.
Arbitrage Betting
Arbitrage betting means covering every outcome of an event across different sportsbooks at odds that guarantee a profit no matter what happens.
Asian Handicap
A soccer spread bet that adds or subtracts goals from a team's score, using lines that can fully or partially remove the draw as a result.
Bad Beat
A bad beat is a wager that appears certain to win until a late, improbable turn of events flips the outcome against the bettor.
Bankroll
Bankroll is the total money a bettor sets aside strictly for wagering, separate from personal funds, used to size bets and survive losing streaks.
Betting Handle
Betting handle is the total dollar amount wagered on a game, market, or sportsbook over a given period, regardless of who wins.
Betting Limits
Betting limits are the maximum amounts a sportsbook allows on a single wager, varying by sport, market, and bettor.
Bonus Bet (Free Bet)
A bonus bet is site credit you can wager once; if it wins you keep the profit, but the stake itself isn't returned to your balance.
Buying Points
Buying points means paying extra vig to move a point spread (or total) in your favor, most valuable when it lets you cross a key number like 3 or 7.
Cash Out
Cash Out lets a bettor settle a wager before the event ends, locking in a sportsbook-set payout instead of waiting on the final result.
Chalk
Chalk is betting slang for the favorite — especially a heavily favored side or outcome that draws the bulk of public money.
Closing Line Value (CLV)
Closing line value (CLV) measures whether the odds you bet were better than the odds available right before kickoff.
Cover
In point-spread betting, "cover" means a team beats the spread — winning by more than it was favored by, or losing by less (or winning outright) as an underdog.
Double Chance
Double chance combines two of three possible match outcomes (win, loss, draw) into one bet, trading a smaller payout for built-in draw insurance.
Edge
Edge is the measurable gap between the true probability of an outcome and the probability implied by the odds you're offered.
Even Money
Even money is a bet priced at +100, where the payout on a win exactly equals the amount risked, no more, no less.
Expected Value (EV)
Expected value (EV) measures the average profit or loss a bet would produce if made many times, based on your win probability versus the odds offered.
Fade the Public (Contrarian Betting)
Fading the public means betting against the side taking the majority of tickets, on the theory that lopsided public money skews lines toward bad value.
Favorite vs Underdog
Explains how sportsbooks label the favorite (minus odds, must win by more) and underdog (plus odds, extra cushion) and what that means for payouts.
Futures Bet
A wager on a longer-term outcome, like a champion or award winner, that isn't settled until weeks or months after you place it.
Hedging
Hedging is placing a second bet against your original wager to lock in profit or limit losses regardless of the final outcome.
Hook
The hook is the extra half-point tacked onto a spread or total (like -6.5 or 47.5) specifically so the bet can't end in a push.
Implied Probability
Implied probability converts betting odds into a percentage chance of winning, letting you compare a sportsbook's price to your own estimate of the true likelihood.
Juice / Vigorish (Vig)
Juice, or vigorish, is the built-in commission a sportsbook bakes into its odds that lets it profit no matter who wins.
Kelly Criterion
A bankroll-management formula that sizes each bet as a fraction of your bankroll based on your edge and the odds offered.
Key Numbers
The final-score margins—3 and 7 above all in football—that games land on so often that crossing them changes a bet's value dramatically.
Line Movement
Line movement is the change in a posted odds or point spread between when a market opens and when it closes.
Line Shopping
Line shopping is comparing a bet's odds and point spread across multiple sportsbooks to place it where the number and price are most favorable.
Live Betting (In-Play)
Live betting (in-play) lets you wager on a game already underway, with odds recalculated in real time as the score and clock change.
Matched Betting
Matched betting pairs opposing bets at two sportsbooks to cancel out risk, letting a bettor pocket sign-up bonuses and promos as near-guaranteed cash.
Middling
Middling is betting both sides of the same game at different lines so a specific final result wins both bets.
Moneyline
A moneyline bet is a wager on which team wins a game outright, with odds set by each side's implied chance of winning.
No Action
A settlement where a sportsbook voids a wager and refunds the stake in full because the bet couldn't be fairly graded as a win or loss.
Odds Boost
An odds boost is a sportsbook promotion that temporarily raises the payout on a specific bet, cutting into the house's edge for a limited stake.
Odds Formats
Odds formats are the different ways a sportsbook displays a bet's price — American, decimal, and fractional — all describing the same payout.
Oddsmaker / Bookmaker
An oddsmaker sets a sportsbook's lines and prices; the bookmaker is the business that takes the bets and carries the risk.
Off the Board
"Off the board" means a sportsbook has pulled a game or market from betting, so no new wagers can be placed on it until odds are reposted.
Opening Line / Closing Line
The opening line is a sportsbook's first posted odds on an event; the closing line is the final odds right before it starts.
Over/Under (Totals)
Over/Under (totals) is a bet on whether the combined final score of a game will land above or below a number set by the sportsbook.
Parlay (Accumulator)
A parlay combines two or more bets into a single wager that pays out only if every leg wins, multiplying the odds — and the risk.
Pick'em
A pick'em is a matchup with no point spread, priced instead through moneyline odds because neither team is favored by more than a hair.
Player Prop vs Game Prop
Player props bet on an individual's stats; game props bet on an event or characteristic of the contest itself, not tied to one player or the final score.
Point Spread
A point spread is a handicap that adds or subtracts points from a team's final score so bettors can wager on the margin of victory, not just the winner.
Profit Boost
A Profit Boost is a sportsbook promo that raises the payout odds on a specific bet, usually by a set percentage, for a limited time.
Prop Bet (Proposition Bet)
A prop bet is a wager on a specific occurrence within a game — like a player's yardage total — that doesn't depend on which team wins.
Public Betting Percentage
The share of bets (by ticket count or dollar handle) placed on one side of a game, used to spot where the crowd — and sometimes the sharp money — is leaning.
Push
A push is a tie between the bettor and the sportsbook, where the wager is refunded in full because the result landed exactly on the number.
Qualifying Bet
A qualifying bet is the specific real-money wager a sportsbook requires you to place, at set minimums, to unlock a bonus like free bets or a deposit match.
Reload Bonus
A reload bonus is a deposit match a sportsbook offers to an existing account holder, not a new customer, usually tied to a set date or promo code.
Reverse Line Movement
Reverse line movement is when a betting line shifts against the side taking the most tickets, signaling that sharp money is on the other team.
Risk-Free Bet
A risk-free bet refunds a losing stake as site credit (usually minus a small deduction), not cash, so it's worth less than its face value.
ROI (Return on Investment)
ROI is a bettor's net profit divided by everything they've wagered, expressed as a percentage — the standard measure of long-term betting performance.
Round Robin
A round robin splits a group of picks into every possible smaller parlay combination, so one losing leg doesn't wipe out the whole ticket.
Run Line / Puck Line
The run line (MLB) and puck line (NHL) apply a fixed 1.5-goal/run spread to baseball and hockey moneylines, shifting risk into the odds.
Same-Game Parlay
A same-game parlay bundles multiple bets from one game into a single wager, with sportsbook-adjusted odds that account for how the legs affect each other.
Sharp vs Square
Sharp and square describe two types of bettors — informed pros whose money moves betting lines versus casual fans whose money rarely does.
Site Credit
Site credit is a bonus balance a sportsbook awards instead of cash, usable for wagers but with restrictions before it converts to real money.
Stale Line
A stale line is a posted odds price a sportsbook hasn't updated yet to reflect new information, leaving a short window of value for fast bettors.
Steam Move
A steam move is a fast, near-simultaneous odds shift across many sportsbooks, usually triggered by sharp money forcing books to react in unison.
Straight Bet
A straight bet is a single wager on one outcome—like a spread, moneyline, or total—settled entirely on whether that one pick wins.
Teaser
A teaser is a parlay where a bettor shifts the point spread or total on every leg in their favor by a fixed number of points, in exchange for lower payout odds.
Tout
A tout is a person or service that sells sports betting picks or predictions for a fee, claiming an edge or inside information.
Units
A unit is the fixed slice of a bettor's bankroll used to size every wager, letting results be tracked in relative rather than dollar terms.
Variance (in Betting)
Variance is the natural gap between a bettor's true long-run edge and the ups and downs of any actual sample of bets.
Wagering Requirements (Rollover)
The total amount you must bet before withdrawing bonus funds or the winnings they generate, usually expressed as a multiple of the bonus.