Tare weight

Tare weight is the weight of an empty vehicle or container. By subtracting the gross weight (laden weight), the weight of the goods carried (the net weight) may be determined, useful in determining the cost of the goods carried for purposes of taxation (sometimes called a tarrif) or for tolls related to barge, rail, road, or other traffic. Tare weight is often published upon the sides of railway cars to faciltate the computation of the load carried.

Etymology

From Middle English, perhaps derived from the dutch tarwe (wheat).