A dispensing cap including a first housing portion defining a first chamber, a lid coupled to the first housing and defining an outlet, the lid movable between a first position and a second position, a second housing portion defining a second chamber in fluid communication with the first chamber, the second housing portion further defining a third chamber separate from the second chamber, wherein when the lid is in the first position, the outlet is in fluid communication with the second chamber to dispense a first volume of fluid, and wherein when the lid in the second position, the outlet is in fluid connection with the second chamber and the third chamber to dispense a second volume of fluid. A method of operating a dispensing cap is also provided.

A metering device (100) for dispensing a flowable substance out of a container. The metering device comprises a main part (20) for securing to the container, a dispensing device (30) with a discharge opening (31), and a compensating chamber (40) which is connected to the discharge opening (31). The compensating chamber (40) has an invariable volume, and the compensating chamber (40) has a through-opening (41) and a fill opening (42). A piston (50) is arranged within the compensating chamber (40), wherein the piston (50) can be moved linearly within the compensating chamber (40) such that the through-opening (41) can be closed by the piston (50).