The answer to 'average cost of grout' is that the typical cost for grout can vary widely depending on several factors. In general, the cost of grout can range from around $2 to $20 per square foot, with the average being in the $5 to $12 per square foot range. The exact cost will depend on the type of grout, the size and location of the project, as well as any necessary preparation or cleanup work.
Factors that can influence the cost of grout include the material (cement-based, epoxy, or specialty grouts), the color, the size of the grout lines, and whether the grout needs to be sealed. Larger projects or those requiring more intricate grout work will generally cost more per square foot. It's important to get local quotes from professional cleaners or contractors to get an accurate estimate for your specific project.