A method for determining or estimating a load weight of a load (28) carried by a commercial vehicle, in particular by an industrial truck such as a forklift truck (10), comprises: a) determining a speed ratio between a first speed of at least one first wheel (12) loaded by a load carried in a load carrier (18) of the vehicle and a second speed of at least one second wheel (14) of the operating vehicle (10) which has received the load in the load carrier, which second wheel is less heavily loaded or not loaded by a load carried in the load carrier or is relieved by a load carried in the load carrier; b) determining or estimating the load weight of the carried load (28) on the basis of the determined speed ratio and predetermined reference data. A commercial vehicle (10) comprising a control system (22) carrying out a method of this kind is also provided.