Tools
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CalculatorBonus Value Calculator
Score any bonus 0–100 — deposit match, no-deposit, cashback or sticky. See what it's really worth.
ConverterOdds Converter
Decimal ⇄ fractional ⇄ American, plus implied probability and what a $10 bet returns.
CalculatorMargin & Fair Odds
The bookmaker's margin (vig) and the no-vig fair odds behind any market.
CalculatorParlay / Accumulator
Combine 2–8 legs for the combined odds and payout — and why margin compounds.
CalculatorHedge / Cash-Out
How much to stake on the opposite outcome to lock in a guaranteed result.
CalculatorArbitrage (Sure Bet)
Check if two odds make a sure bet, the guaranteed profit %, and how much to stake on each side.
CalculatorKelly Criterion
The mathematically optimal stake from your bankroll, edge and odds — full, half and quarter Kelly.
CalculatorExpected Value (EV)
Is a bet +EV? Enter your probability, the odds and stake to see the value in money and % edge.
CalculatorClosing Line Value (CLV)
Did you beat the close? Your CLV as a price % and in probability points, with an optional no-vig adjustment.
CalculatorEach-Way
Win & place returns from your stake, the odds and the place terms — wins, places or loses.
CalculatorFree Bet Value
What a free bet really returns (stake-not-returned vs returned) and why higher odds keep more of it.
Which tool, when?
Every calculator here answers one practical question — this is the map.
Before you bet
Odds converter to read any format, margin calculator to see the bookmaker's cut, and EV calculator to know if the price is actually good.
Sizing the stake
Kelly staking for how much to risk, parlay calculator for combined odds, each-way for racing returns.
Bonuses & exits
Bonus value for what an offer is really worth, free bet and hedge/cash-out to lock a result, arbitrage and CLV for the sharper stuff.
All tools run in your browser — nothing is sent to a server, nothing is tracked. Read the companion guides for the theory behind each one.