How much is a bolt of material?

This depends on the manufacturer of the material and what type of material is on the bolt. A bolt is not necessarily a unit of measure for material, it is simply a means of wrapping the fabric neatly for both the transport and sale of the material. A bolt can also only carry a certain amount of weight depending on the strength of the cardboard. Therefore, the amount of material on a bolt can vary greatly. In regards to "how much" meaning "how much does a bolt of material cost" (if this is what is being asked), this also depends greatly on the type of material. Fabric can range in price anywhere from <$1 a yard to >$200 a yard depending on the type.