Tool · Calculator
Arbitrage calculator
When the two sides of a binary outcome are priced differently across two books or platforms, you can sometimes back both for a guaranteed profit. Enter the decimal odds for each side and your total stake — we'll tell you whether it's a real arb, how to split the stake, and the profit.
Combined implied probability
96.40%
Arbitrage — guaranteed profit. Stake as below for an equal payout either way.
Stake on A
$493.98
Stake on B
$506.02
Guaranteed profit
$37.35
ROI
3.73%
Real spreads close fast and fees/slippage eat the edge — this is a math tool, not betting advice.
How it works
- Arb condition: 1/oddsA + 1/oddsB < 1. That combined number is the implied probability; under 100% means free money before fees.
- Stake split: stake each side in proportion to 1/odds so the payout is equal whichever side wins.
- Reality check: spreads close in minutes, and fees, slippage, and withdrawal delays eat the edge. Treat printed arbs as leads, not guarantees.
We auto-detect cross-platform spreads on the arbitrage tracker.