Calculator

Matched betting calculator

Enter your back stake, back odds, lay odds, and exchange commission. The calculator balances both sides so you end up with the same (or near-same) outcome whatever happens.

Find the optimal lay stake to lock in the same outcome on both sides.

Back stake

Back odds (decimal)

Lay odds (decimal)

Exchange commission

Lay bet

Lay stake: $49.50
Liability: $51.98
Commission: $1.44

Scenarios

If back wins: -$1.98
If lay wins: -$1.98
Expected value: -$1.98

Keep more of your winnings

Commission is the one variable you fully control. SharkbetX (SBX) charges a flat 3% on net winnings only, with Polymarket's deep order book behind the lay side.

Place the lay side of every qualifier through SBX and keep the commission delta for yourself.

Open an SBX account

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