The size of concrete mixers varies depending on the model, purpose and manufacturer. Generally speaking, small concrete mixers may be compact in size for home or small projects, while large industrial concrete mixers may be quite large in size to meet the needs of large-scale production.

For small concrete mixers for home or small projects, their size usually ranges from a few dozen centimeters to more than a meter, depending on the mixing capacity and power. These small mixers are usually easy to move and store, suitable for operation in limited spaces.
For large industrial concrete mixers, their size may reach several meters or even larger. These mixers usually have higher mixing capacity and power to meet the needs of large-scale production. At the same time, they are also equipped with more complex control systems and safety equipment to ensure the smooth progress of the production process and the safety of workers.
If you need the size information of a concrete mixer for a specific model or purpose, please let me know the specific needs so that I can provide a more accurate response.