Lay Stake & Liability Calculator

For matched-betting and trading. Enter your back bet, the current lay odds and the exchange commission to see the lay stake that equalises profit on both sides.

Back stake (£)

Back odds (decimal)

Lay odds (decimal)

Exchange commission (%)

Bet type

Enter values and press Calculate.

Formulas

Qualifying bet: lay stake = (back odds × back stake) / (lay odds − commission)
Free bet (SNR): lay stake = ((back odds − 1) × back stake) / (lay odds − commission)
Liability: (lay odds − 1) × lay stake

Commission applies to net winnings on the exchange, so it shifts the effective lay price slightly.