In order to break even when betting on spread sports (considering standard -110 juice), a bettor must win 52.38% of the time. Anything above 55% is considered to be highly profitable.
Decimal odds explained\n\n For example, aR$100 bet made at decimal odds of 3.00 would returnR$300 ($100 x 3.00): $200 in profit and the originalR$100 amount risked. AR$100 bet made at decimal odds of 1.50 would returnR$150:R$50 in profit and the originalR$100 amount risked.