See what your bet is actually worth.
Your book hides its cut in every line. Paste the market and actualodds rips the juice out: fair odds, true EV, and the exact stake to fire.
Free. Instant. No account needed.
Worst-case: methods to compare
Weighted average: method weights (%)
Bankroll, Kelly & display
Where your edge leaks
Take a coin flip. A fair book would post +100 both ways. Yours posts −110/−110. Bet both sides and you lay out $220 to collect $210. That missing $10 is the vig: a tax sewn into every price on the board. Devigging backs the tax out. It looks at every side of a market, strips the margin, and hands you the probability the book is actually pricing. Stack that fair line against a boost or promo and the verdict is instant: positive EV, fire. Negative, walk.
Your edge, played forward
An edge doesn't pay you on schedule. It pays you eventually, through swings that will test your nerve. Dial in your numbers and watch what a real bankroll does: the dashed line is the math, the wiggly ones are your life.
Devig methods, explained
Books don't spread their cut evenly: longshots usually carry more of it than favorites. Four methods, four opinions on where the juice hides. Same market, watch +650/−900. The calculator's default takes the worst case across all four, so a play that survives doesn't depend on you picking right.
Multiplicative
Shaves every side by the same ratio. Goes easy on longshots. +650/-900 → +675
Best for: tight two-way markets near even money: spreads and totals at standard juice.
Additive
Takes an equal bite of raw probability from each side, which lands harder on the longshot. +650/-900 → +757
Best for: two-way markets with a modest favorite: moneylines around −150 to −250.
Power
Fits an exponent to the whole market. Harshest on longshots, kindest to chalk. +650/-900 → +815
Best for: lopsided markets: heavy favorites, big dogs, alt lines and boosted longshots.
Shin
Models a book defending itself against sharp insider money. Matches additive on two-way markets, splits from it on three or more. +650/-900 → +757
Best for: multi-way markets: futures, outrights, first-scorer props.
Speak its language
Type odds the way you already think about them. Five short lessons, ten seconds each. Tap any example to load it live.
Legs & markets start here
A comma starts a new leg. A slash separates the sides of one market. Your side goes first. That's 90% of it.
| Your side, then theirs | +240/-310 | try |
| Parlay: stack legs with commas | -115/-105, +130/-155 | try |
| Multi-way market: list every runner | +360/+220/+700/+1100 | try |
| Backing two runners? Glue them with ^ | +475^+625/+900/-170 | try |
| Either bet can cash (independent) | -130/+105||-160/+130 | try |
| Leave yourself a note | +240/-310 // out by Sunday |
Only one side posted?
No other side on the board? Tell it the juice and it rebuilds the market for you.
| Assume the juice yourself | +310/6% | try |
| Borrow the juice from a market you can see | +310/[-122/-102] | try |
Blend books & lines
One book's price is an opinion. Several books are a consensus. Mix them inline.
| Average a few books | AVG(-142,-138)/AVG(+118,+122) | try |
| Shortest or longest price wins | MIN(-145,-150)/+125 | try |
| You already know the hit rate | HIT(58%)/4% | try |
| Your line sits between two posted ones | INT(25.5;23.5=-175,27.5=-115)/4.5% | try |
Boosts, promos & strange payouts
The Final Odds box prices whatever the promo desk dreams up. Whole payout tables included.
| A boosted price | +350 | try |
| Final odds quoted as a parlay | -135,-250 → it prices to +144 | try |
| Parlay insurance: 3 hit pays the parlay, 2 hit refunds half | 3=-260,-220,-190;2=0.5x | try |
| Risk-free bet (r = what the refund is worth to you) | 1=+250;r=0.65x | try |
| Win & get a bonus on top | 1=-240;w=0.6x | try |
| Get it win or lose | 1=-550;n=0.3x | try |
| Boost box does math | 100%*65% (full boost, paid in 65¢ bonus dollars) |
Correlated legs
Same-game legs move together, and pretending they don't will torch your EV math. Tell it how much.
| You know the correlation | 0.25 | try |
| Let the book confess: their SGP price vs their own legs | +155=-190,-120 | try |
| Full SGP market: all four combos, then each leg | 135/550/850/125=-125/-105,110/-135 |
The juice
Short reads on betting math. No picks, no fairy dust.
Devig your first boost in 60 seconds
The three-step routine that turns any "Boosted!" banner into a yes or a no before the line moves.
Read →Are odds boosts ever worth it?
One real boost, one marketing boost, one monster. The math that tells them apart before you tap.
Read →Which devig method should you use?
Four formulas, four answers, sometimes 140 points apart. Why worst-case is the one to trust.
Read →Why a winning bettor can lose for months
20,000 simulated bankrolls with a genuine 3% edge. A quarter were still down after 500 bets.
Read →How to turn a free bet into real cash
A $50 free bet is not $50. Where the value hides, and the odds range that cashes out the most.
Read →What is vig? The tax inside every betting line
The $10 the book keeps on every coin flip, what it costs you a year, and how to see through it.
Read →