A volumetric concrete mixer (also known as volumetric mobile mixer and metered concrete truck) is a truck that contains concrete ingredient materials and water to be mixed on the truck at the job site to make and deliver concrete according to the amount needed.

The mixer is a mixing device that measures the raw materials using volume rather than weight. The volumetric mixer blends the concrete mixture using an auger or a paddle or a drum device to mix the ingredients with water. The volumetric mixing process starts with a batch metering system that allows the volume of raw materials to be measured prior to entering the mixing chamber. This process can be as simple as using a measured bucket, to highly sophisticated and computerized batch plants that feed the correct volume.