Betting tools, calculators for value, arb, kelly, parlay

Calculate stake split and guaranteed profit for any 2-way or 3-way arbitrage. Enter total stake and the odds at each book; we do the rest.

Compute expected value per €1 staked given your odds and the true probability. Positive EV = profitable in the long run.

Optimal stake sizing for value bets. Kelly maximises long-run bankroll growth. Most pros bet 25-50% of full Kelly to absorb variance.

Convert between decimal, fractional, American, and implied probability. Live as you type.

Multiply legs to find your total parlay odds and payout. Add or remove legs dynamically.

Lock in profit or limit losses by betting the opposite side at a different price. Calculate the hedge stake and net result.

Strip the bookmaker margin out of a 2-way or 3-way market and reveal the true implied probability.

Estimate match outcome probabilities and 1X2 fair odds using a simple Poisson model based on expected goals.

Calculate the margin baked into a bookmaker's prices. Lower margin = sharper book.

Stake multiple selections in the same race or market so they all return the same profit. Useful for outrights and over/unders.

Compare the price you bet to the closing line. Beating closing consistently is the strongest signal of long-term profitability.

Log every bet locally in your browser. Tracks ROI, hit rate, and total P&L. No account, no server, your data stays on your device.