Betting Calculators & Tools | Arbworld

Free, no-signup calculators that pair with the live Moneyway and Dropping Odds data on Arbworld.

Arbitrage Calculator

Stakes & profit for 2–6 selection arbs (decimal or fractional odds).

Margin / Overround

Paste a market's odds — see the bookmaker's margin and the price you actually pay.

No-Vig Fair Odds

Strip the bookmaker overround from any 2- or 3-way market for the true probability.

Convert between decimal, fractional, American odds and implied probability.

Lay Stake & Liability

Equal-profit lay stake for any back bet — with Betfair commission support.

Hedging / Cash-Out

Lock in profit (or limit losses) when prices move after your bet.

Split a stake across multiple selections so every winner returns the same profit.

Kelly Criterion

Mathematically optimal stake size from edge, odds and bankroll.

Parlay / Accumulator

Combined odds and payout for up to 10 legs.

Looking for explainers?

Articles like What is Moneyway?, What are Dropping Odds? and the rest of the betting guides live in the Info / Articles section →