The quantity of commodities is one of the indispensable main conditions in the international sales contract. According to the laws of some countries, the seller ’s delivery quantity must be consistent with the contract, otherwise, the buyer has the right to file a claim or even reject the goods. We can see that the quantity agreed by both parties of the transaction is the basis for handing over the goods. Therefore, it is very important to correctly grasp the quantity of the transaction and the quantity clauses in the contract. Quantity clause The quantity clauses in the sales contract mainly include the quantity and unit of measurement of the commodities traded. For goods sold by weight, the method of calculating weight must also be specified. Measure unit for goods quantity In international trade, there are four common units of measurement based on the system of weights and measures: metric system, English system, American system, and international unit system. China ’s export commodities use the international system of units. Except for the metric, imperial or U.S. units of measurement agreed upon by the other country ’s trade practices, they all use national legal units of measurement. If different countries use different weights and measures system, it will lead to differences in the quantity expressed by the same unit of measurement. For example, in terms of weight-expressing tons, the metric system generally adopts metric tons, and each metric ton is 1000 kilograms; the imperial system generally adopts long tons; countries that implement the US system generally use short tons, each short ton is 907 kg. Product weight measurement In international trade, there are many commodities measured by weight. Generally, there are several methods for calculating weight: gross weight, net weight, metric, theoretical weight, legal weight and physical net weight. Among them, net weight is the most common weight measurement method in international trade. Precautions The quantity clause is the main clause of the contract, and we should pay attention to the following points when drawing up: 1. Grasp the number of transactions correctly. 2. It is clear whether the measurement method is based on net weight or gross weight. Specify the unit of measurement, for example, when measuring in "tons", it is necessary to specify whether it is long tons, short tons or metric tons. 3. The quantity clause should clarify the specific numerical value and wording, and avoid the use of generalized words such as "approximately", "approximately", and "left and right" to express quantity. And it is necessary to reasonably stipulate the amount of maneuverability, for example, in the transaction of bulk commodities such as grain, ore, fertilizer and sugar, the specific percentage of increase or decrease or expansion must be specified in the contract for the "overfill" and "approximate" quantities.