EN IEC 80000-13:2025
(Main)Quantities and units - Part 13: Information science and technology
Quantities and units - Part 13: Information science and technology
IEC 80000-13:2025 specifies names, symbols and definitions for quantities and units used in information science and technology. Where appropriate, conversion factors are also given. Prefixes for binary multiples are also given. International Standard IEC 80000-13 has been prepared by IEC technical committee 25: Quantities and units in close cooperation with ISO/TC 12: Quantities and units. This second edition cancels and replaces the first edition published in 2008. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: addition of new prefixes for binary multiples.
Größen und Einheiten - Teil 13: Informationswissenschaft und -technik
Grandeurs et unités - Partie 13: Science et technologies de l'information
L'IEC 80000-13:2025 spécifie les noms, les symboles et les définitions des grandeurs et unités utilisées dans la science et les technologies de l'information. Des facteurs de conversion sont également indiqués, s'il y a lieu. Des préfixes pour multiples binaires sont aussi donnés. La Norme internationale IEC 80000-13 a été établie par le comité d'études 25 de l’IEC: Grandeurs et unités, en collaboration étroite avec le comité technique 12 de l’ISO: Grandeurs et unités. Cette seconde édition annule et remplace la première édition parue en 2008. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: ajout de nouveaux préfixes pour les multiples binaires.
Veličine in enote - 13. del: Informacijska znanost in tehnologija
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Nadomešča:
SIST EN 80000-13:2008
Veličine in enote - 13. del: Informacijska znanost in tehnologija
Quantities and units - Part 13: Information science and technology
Größen und Einheiten - Teil 13: Informationswissenschaft und -technik
Grandeurs et unités - Partie 13: Science et technologies de l'information
Ta slovenski standard je istoveten z: EN IEC 80000-13:2025
ICS:
01.060 Veličine in enote Quantities and units
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD EN IEC 80000-13
NORME EUROPÉENNE
EUROPÄISCHE NORM April 2025
ICS 01.060; 01.040.35 Supersedes EN 80000-13:2008
English Version
Quantities and units - Part 13: Information science and
technology
(IEC 80000-13:2025)
Grandeurs et unités - Partie 13: Science et technologies de Größen und Einheiten - Teil 13: Informationswissenschaft
l'information und -technik
(IEC 80000-13:2025) (IEC 80000-13:2025)
This European Standard was approved by CENELEC on 2025-03-18. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 80000-13:2025 E
European foreword
The text of document 25/811/FDIS, future edition 2 of IEC 80000-13, prepared by TC 25 "Quantities
and units" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2026-04-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2028-04-30
document have to be withdrawn
This document supersedes EN 80000-13:2008 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 80000-13:2025 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
ISO 80000-1:2022 NOTE Approved as EN ISO 80000-1:2022 (not modified)
ISO 80000-3:2019 NOTE Approved as EN ISO 80000-3:2020 (not modified)
IEC 80000-13
Edition 2.0 2025-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Quantities and units –
Part 13: Information science and technology
Grandeurs et unités –
Partie 13: Science et technologies de l'information
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 01.060; 01.040.35 ISBN 978-2-8327-0160-7
– 2 – IEC 80000-13:2025 © IEC 2025
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
0.1 Tables of quantities . 5
0.2 General . 5
0.3 Remark on units for quantities whose dimensional exponents are all equal to zero . 5
0.4 Numerical statements in this International Standard . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Prefixes for binary multiples . 17
Alphabetical index . 18
Bibliography . 20
Table 1 – Quantities and units in information science and technology . 7
Table 2 – Prefixes for binary multiples . 17
IEC 80000-13:2025 © IEC 2025 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
QUANTITIES AND UNITS –
Part 13: Information science and technology
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC and ISO draw attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC and ISO take no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, IEC and ISO had not received notice of
(a) patent(s), which may be required to implement this document. However, implementers are cautioned that this
may not represent the latest information, which may be obtained from the patent database available at
https://patents.iec.ch or www.iso.org/patents. IEC and ISO shall not be held responsible for identifying any or all
such patent rights.
IEC 80000-13 has been prepared by IEC technical committee 25: Quantities and units in close
cooperation with ISO/TC 12 Quantities and units. It is an International Standard.
This second edition cancels and replaces the first edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of new prefixes for binary multiples.
– 4 – IEC 80000-13:2025 © IEC 2025
The text of this International Standard is based on the following documents:
Draft Report on voting
25/811/FDIS 25/823/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
A list of all parts in the ISO 80000 and IEC 80000 series, published under the general title
Quantities and units, can be found on the ISO and IEC websites.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IEC 80000-13:2025 © IEC 2025 – 5 –
INTRODUCTION
0.1 Tables of quantities
In most cases, only one name and only one symbol for the quantity are given; where two or
more names or two or more symbols are given for one quantity and no special distinction is
made, they are on an equal footing. When two types of italic letters exist (for example as with
ϑ and θ; φ and φ; a and a; g and g), only one of these is given. This does not mean that the
other is not equally acceptable. It is recommended that such variants should not be given
different meanings. A symbol within parenthesis implies that it is a reserve symbol, to be used
when, in a particular context, the main symbol is in use with a different meaning.
0.2 General
The names of units for the corresponding quantities are given together with the international
symbols and the definitions. These unit names are language-dependent, but the symbols are
th
international and the same in all languages. For further information, see the SI Brochure (9
edition 2019, updated in 2024) from BIPM and ISO 80000-1.
The units are arranged in the following way:
• The coherent SI units are given first. The SI units have been adopted by the General
Conference on Weights and Measures (Conférence Générale des Poids et Mesures,
CGPM). The use of coherent SI units, and their decimal multiples and submultiples formed
with the SI prefixes are recommended, although the decimal multiples and submultiples are
not explicitly mentioned.
• Some non-SI units are then given, being those accepted by the International Committee for
Weights and Measures (Comité International des Poids et Mesures, CIPM), or by the
International Organization of Legal Metrology (Organisation Internationale de Métrologie
Légale, OIML), or by ISO and IEC, for use with the SI. Such units are separated from the SI
units in the item by use of a broken line between the SI units and the other units.
0.3 Remark on units for quantities whose dimensional exponents are all equal
to zero
The coherent unit for any quantity whose dimensional exponents are equal to zero is the number
one, symbol 1. When the value of such a quantity
...
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