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REACH法规关于计算注册吨数的规定:中国检验检疫REACH解决中心
(Article 30) “Per year: means per calendar year, unless stated otherwise, for phase-in substances that have been imported or manufactured for at least three consecutive years, quantities per year shall be calculated on the basis of the average production or import volumes for the three preceding calendar years;”中国检验检疫REACH解决中心
因此，非常明确地（对于分阶段物质）是以前三个日历年的平均值作为每一年的量。在正式的指南文件“Guidance on registration”里有关于注册吨数计算更具体的方法：
“The volume of a non-phase-in substance to be reported in a registration dossier is the estimated quantity that is expected to be manufactured and/or imported in the calendar year (1 January - 31 December) of registration (see Article 3(30)). ”中国检验检疫REACH解决中心
“In the case of a phase-in substance that has been imported or manufactured for at least three consecutive years, the quantities per year shall be calculated on the basis of the average production or import volumes for the three preceding calendar years. If the substance has not been manufactured or imported for 3 consecutive years then the calendar year tonnage should be used. 中国检验检疫REACH解决中心
This provision has been put in place to avoid situations where a sudden increase in demand would lead to the impossibility to comply with the registration obligations. This value is to be used for the purpose of pre-registration as well as for registration. The highest yearly tonnage calculated after 1 June 2007 determines the deadline for registration. ”中国检验检疫REACH解决中心
对于非分阶段物质，只能是一个从1月1日到12月31日生产或进口量的估计值；对于分阶段物质，每年的数量要按以前连续三个日历年度的平均值计算。如果没有连续三年的数据，就按当年的量计算。而决定注册期限的吨位数则应按2007年6月1日以后最高的年吨位数计算。中国检验检疫REACH解决中心
所以，注册吨位数不是随意决定的，而是要由前三年的平均值计算得出。