According to the search results, the size of a bath towel can vary depending on the brand and type of towel. However, the most common size for a bath towel is 70cm x 140cm. Other sources provide a range of sizes for bath towels, with dimensions typically ranging from 50 x 101 centimeters to 76 x 147 centimeters. It is important to note that bath sheets can be used as an alternative to a bath towel, and they usually have larger sizes than a bath towel. Bath sheet sizes can range from 35 x 60 inches to 40 x 70 inches, or from 89 x 152 centimeters to 101 x 177 centimeters.