Weight classes are in Kilos. To determine which class you regsiter for, choose the weight that is above your bodyweight. For instance, if you weigh 61kg, you choose the 65kg weight class. If your scale does not weigh in Kg, take lbs divided by 2.2 and it will give you a close estimate of what your weight is in Kg. We recommend not trying to "make weight" and diet down if this is your first event.