The effective power of a geologist's hammer is mainly considered to be a reflection of its head weight and handle length. Head weight may range from  or less on a small hammer—such as would generally be used for casual use or by children—to  and greater.
The power of a geologist's hammer is mainly attributed to the weight of its head and the length of its handle. The weight of the head can range from  to  on a small hammer, which is typically used for casual use or by children, while larger hammers have heads weighing  and more.