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Decree Law No. 76/2020

Publication: Republic Diary No. 188/2020, Series I of 2020-09-25
  • Issuer: Presidency of the Council of Ministers
  • Diploma Type: Decree Law
  • Number: 76/2020
  • Pages: 12 - 21

Summary in plain english

What is it?

This decree-law adapts to technical progress the new definitions of the basic units of the International System of Units.

The International System of Units (SI) is an internationally established decimal metric system. It defines the names, symbols and definitions of units of measurement. It is used worldwide as a universal system of units.

What is going to change?

This decree-law applies to the definitions and rules of use and writing of SI units.

The system of legal units of measurement designated by the General Conference on Weights and Measures (CGPM) as SI is applicable throughout the national territory.

Exceptional use of other units of measurement

The use of units of measurement deemed to be non-legal is permitted in respect of anything relating to products and equipment placed on the market or put into service before the entry into force of this decree-law;


Compliance with these rules is monitored by the Food and Economic Security Authority (ASAE).

Whoever uses unauthorised units of measurement is punished with a fine of up to 3,740.00 EUR in the case of natural persons, or up to 44,890.00 EUR in the case of legal persons.

What advantages does it bring?

This decree-law contributes to the uniform implementation of the IS and facilitates its use by different economic operators and by Portuguese society in general.

When does it enter into force?

This decree-law enters into force on 26 September 2020.

Original Version


  • Legal translator is the translation of texts within the field of law


Legislative consolidation integrates the various amendments and rectifications made into an original legal diploma in order to make its consultation more accessible to the citizen.