3 ms·In UK gambling conventions, 8/1 means you win £8 on a £1 bet. So 12.5% chance, if the bookie is a non profit.by netcan 14y agoIn UK gambling conventions, 8/1 means you win £8 on a £1 bet. So 12.5% chance, if the bookie is a non profit.mmahemoff 14y agoClose :). You receive £9 on a £1 bet (you get your outlay back), so it's 1/9 ~ 11.1% http://www.isfa.com/odds-probability-chart.php http://www.isfa.com/odds-probability-chart.phpnetcan 14y agoyou're right. oops.