How many ounces in a liter? Liters to fluid ounces volume units conversion factors are listed below. To find out how many ounces in liters, multiply by the right factor or instead, use the converter below if converting into US fluid ounces. 1 Liter = 33.8140226 Ounces [Fluid, US] 1 Liter = 35.195 079 Ounces [UK] For fluid oz to liter converter, please go to fluid oz to liter.