Aggregate batching is simpler than that of cement because of a more constant natural flow rate. In fine aggregate, the moisture content does effect the flow rate. This is unimportant because volume, not weight, is the desired quantity. The volume is found as a function of the weight.

When batching concrete, the volume of aggregate needed is much larger than that of any other ingredient. This large volume creates a less stringent tolerance. If an individual material batcher is used a +/- 2% tolerance is needed.

In a cumulative batcher a +/-1% tolerance is used. Multiple individual batchers may be used to increase productivity and accuracy.

There are two types of aggregate batcher: gates and belt conveyers. Gates must be sized to provide 2 ½ times the lump size that must pass. Many gates use a two-stage cut-off with a final "dribble" feed. The others use an adjustable mid-air compensation for individual materials or a 2-stage "fast" and "slow" gate.

Belt conveyors deliver the aggregate to the batchers at a constant speed. It is a very simple and effective method. This method has a good uniform flow rate. This makes mid-air compensation very predictable.