According to the Inline Skating Resource Center, the average amount of calories burned during a 30-minute period while rollerblading at a comfortable, steady speed is 285 calories. This figure varies widely depending on the speed and intensity of the rollerblader as well as the weight of the person rollerblading.
The Mayo Clinic estimates that a person weighing 160 pounds burns an estimated 548 calories per hour of rollerblading while someone weighing 200 pounds burns approximately 683 calories per hour. As a general rule, the faster and harder the movement, the more calories that are burned. Rollerblading uphill is an excellent way to burn more calories.