– the intergovernmental organization through which Member States act together
     on matters related to measurement science and measurement standards.
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About the BIPM
Metrology area:
Acoustics, Ultrasound and Vibration
Chemistry and Biology
Electricity and Magnetism
Ionizing Radiation
Mass and related quantities
Photometry and Radiometry
Time and Frequency

The BIPM's mission and role:

The mission of the BIPM is to ensure and promote the global comparability of measurements, including providing a coherent international system of units for:

  • Scientific discovery and innovation,
  • Industrial manufacturing and international trade,
  • Sustaining the quality of life and the global environment.

The unique role of the BIPM enables it to achieve its mission by developing the technical and organizational infrastructure of the International System of Units (SI) as the basis for the world-wide traceability of measurement results. This is achieved both through technical activities in its laboratories and through international coordination.

2014 Director's report:
The 2014 Director's Report is now available in English on the BIPM website. It will be translated into French and made available as soon as possible on the website. Publication of new ozone cross-section measurements for the accurate monitoring of air quality:
New measurements of the ozone cross section carried out in the BIPM laboratories have been published with a relative standard uncertainty of 0.43 %, the smallest to date. Adoption of these new values would resolve differences between reference methods for surface ozone measurements. IPPP: a new technique to improve clock frequency comparisons:
A joint project between the BIPM, CNES and CLS has developed and tested the IPPP (PPP with integer ambiguity resolution) technique which will lead to a significant improvement in clock frequency comparisons using GPS signals. Session I of the 104th meeting of the CIPM:
The decisions of the CIPM at their meeting in March 2015 are now available. Results of measurements with the International Prototype of the Kilogram published:
Between January 2014 and January 2015, the BIPM Mass Department carried out a calibration campaign with respect to the International Prototype of the Kilogram (IPK), in anticipation of the planned redefinition of the kilogram. The results have been published in the latest edition of Metrologia. This calibration campaign, named "Extraordinary Calibrations", is an important element of the CCM roadmap towards the redefinition of the kilogram. News from the 29th CCEM:
The CCEM held its 29th meeting on 12 and 13 March 2015 at the BIPM. The meeting was chaired by its new President, Dr Gert Rietveld from VSL, who made a presentation to the retiring President, Dr Barry Inglis, to thank him for his work over 12 years as President of the CCEM. New President of the CCEM: Dr Gert Rietveld:
The CIPM has appointed Dr Gert Rietveld as the new President of the CCEM for a four-year term. New President of the CCL: Prof. Massimo Inguscio:
The CIPM has appointed Prof. Massimo Inguscio as the new President of the CCL for a four-year term.