All calculators

20 tools, one page

Every calculator takes American, decimal or fractional odds and shows the working. Nothing is gated, nothing needs an email.

01 Back/lay Cover a bookmaker bet on the exchange. Lay stake, liability, both outcomes. → 02 Back/back Cover a bet with a back bet on a different bookmaker. Two books, guaranteed profit from either outcome. → 03 Lay stake / liability What a lay actually risks, before you accept the bet. → 04 Dutching Split one bankroll across several selections for an equal return. → 05 Odds converter American, decimal, fractional and implied probability — one input, every format. → 06 Implied probability Turn any price into the chance it represents, with the vig stripped out. → 07 Expected value Your edge per bet in dollars, given your own probability estimate. → 08 Kelly criterion Stake sizing from edge and bankroll — full, half and quarter Kelly. → 09 Arbitrage (surebet) Two-way and three-way arb stakes with the locked profit. → 10 Bonus / free bet value What a free bet is worth in cash after you lay it off. → 11 Accumulator / parlay Combined price, payout and the probability you are really taking. → 12 Hedging Close out a live position and take a guaranteed number. → 13 Lay odds converter The fair price of the opposite outcome, from a single price you already have. → 14 Feasibility A conservative probability band and how many attempts a combined bet like this really needs. → 15 Overround / hold Add up a market's prices to see the bookmaker's built-in margin, as a percentage of every dollar staked. → 16 Middle Bet both sides of a shifted line and see the guaranteed floor against the bonus if the score lands in the middle. → 17 Spread converter The price on a point-spread bet in every format, plus a heads-up on push risk for whole-number lines. → 18 Strike rate Your actual win rate against the breakeven rate your average price demands. → 19 Win / loss record Turn a stretch of bets into net profit, ROI, strike rate and your average winning price. → 20 Staking plan Convert a stake between dollars and percentage of bankroll, with a quick-reference unit-size table. →

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