Betting
Sportsbooks and prediction markets quote prices in different languages—translate them into comparable probabilities and payouts.
Odds formats are conventions; probability is the underlying quantity. These tools help you move between American, decimal, and fractional quotes, combine legs for parlays when independence assumptions hold, estimate hedge stakes to lock outcomes, and explore cash-out approximations. Nothing here predicts winners—use them for bookkeeping, comparison shopping, and understanding what the numbers imply. Always follow local laws and bet responsibly.
Price ↔ chance
Decimal odds imply win probability ≈ 1/odds (ignoring vig). American odds encode profit per stake—convert before comparing lines.
Parlay honesty
Multiplying leg probabilities assumes independence (or uses supplied joint inputs). Correlated legs break naive parlay math.
Lock or trim risk
Offsetting stakes across outcomes can stabilize return given updated prices—sizes depend on odds and desired guarantees.
Early settlement
Books offer buyouts blending fair value and margin; calculators help benchmark offers against simple models.
Calculators
View all betting toolsBetting Hedge Calculator
Balance stakes across opposing outcomes so wins net similarly—useful after line moves or bonus constraints.
Betting Odds
Translate quoted odds into implied probability and profit scenarios for single-sided bets.
Odds Converter
Jump between American, decimal, and fractional displays without mental gymnastics.
Prediction Market Odds Converter
Map contract-style prices (often cents on the dollar) into readable probabilities and complements.
Parlay Calculator
Combine leg prices into parlay payout multiples—mind independence assumptions for realistic edges.
Poker Odds
Estimate drawing odds and pot-implied scenarios for common hold’em-style decisions.
Cash Out Value
Benchmark a cash-out quote against a simplified fair-value model from remaining odds.
Parlay Cash Out Value
Approximate early settlement value when multiple legs remain unsettled.
Guides & Articles
View all Betting articles
Triple Crown horse racing: history, strategy, and legendary feats
Discover the thrilling history, strategy, and legendary feats of the Triple Crown. Learn what makes these races the pinnacle of horse racing success!
The Kentucky Derby Purse Is $5 Million. Here's What the Winning Owner Actually Takes Home.
The 2026 Derby purse is $5 million, but the winner's share splits across finishers, jockey, trainer, federal and Kentucky tax, and syndicates. Here is the full owner net, syndicate per-investor math, stud fees, betting taxes, and compound growth.
Masters 2026 Betting Odds Explained: What Scheffler at +550 Actually Means
A plain-English guide to reading golf betting odds, understanding implied probability, and what the numbers tell you before a ball is struck at Augusta National.
What Are Prediction Markets - And Which Ones Are Legal in the US?
A complete guide to how prediction markets work, which platforms US residents can use legally in 2026, and how regulation is reshaping the industry.
The Math Behind the Madness - March Madness Deep Dive
The odds are 1 in 9.2 quintillion. The record is 49. The prize was $1 billion. An inside look at the beautiful, brutal, and statistically absurd world of the March Madness bracket.
How to Guarantee You Win the Powerball Lottery (And Why You Still Shouldn't)
There's exactly one way to guarantee you win the Powerball jackpot: buy every possible combination. See the exact math, the $584M cost, break-even jackpot size, and why it would still bankrupt you.
What is Hedging in Sports Betting? When & How to Hedge Bets (2026)
Learn what hedging means in sports betting, when you should (and shouldn't) hedge your bets, and how to calculate the perfect hedge amount. Complete guide with examples and strategies.
Formula Quick Reference
Lines move; definitions matter—confirm posted rules with your operator and jurisdiction for anything binding.
| Formula | Equation | Variables | Result unit | Calculator |
|---|---|---|---|---|
| Implied probability (decimal) | p ≈ 1 / d | decimal odds d; ignores vig | probability | Use calculator → |
| American → decimal (positive) | d = 1 + US/100 | US > 0 | decimal odds | Use calculator → |
| American → decimal (negative) | d = 1 + 100/|US| | US < 0 | decimal odds | Use calculator → |
| Independent parlay (decimal) | d_parlay = d₁ × d₂ × … | correlation breaks independence | decimal odds | Use calculator → |
| Complement rule | P(not A) = 1 − P(A) | partition of outcomes | probability | Use calculator → |
| Conditional probability | P(A|B) = P(A∩B)/P(B) | requires P(B) > 0 | probability | Use calculator → |
| Prediction market price | p ≈ price (in $1 scale) | binary contract framing | probability | Use calculator → |
Watch & Learn
Probability foundations—how independence and conditioning relate to odds formats and combined bets.
Probability explained | Independent and dependent events
Foundations for when you can multiply probabilities—and when dependence changes the story.
Conditional probability and independence
How new information updates probabilities—directly relevant to correlated betting legs.
Independent or dependent probability event?
Worked classification practice—helps spot naive parlay assumptions in the wild.
Frequently Asked Questions
Odds formats, independence, and cash-outs—how the calculators fit theory to everyday tickets.