How to Use This Calculator

This tool shows your potential profit or loss from a bet on a betting exchange (like Betfair or Smarkets).

• Trade Type:
  • Back: A normal bet *for* something to win.
  • Lay: A bet *against* something to win.
• Stake:
  • For a Back Bet, this is the amount you risk.
  • For a Lay Bet, this is the *backer’s stake* (the amount you want to win).
• Commission Rate: Your exchange’s fee on net winnings (e.g., enter `5` for 5%).

Understanding the Terms

Example Back Bet: You back £10 at 3.0 odds.

• Win: You profit £20 (minus commission).
• Lose: You lose your £10 stake.

Example Lay Bet: You lay £10 at 3.0 odds.

• Win (Selection Loses): You profit £10 (minus commission).
• Lose (Selection Wins): You lose £20. This is your liability.