Items per kilogramme (IPK) study

Study on the number of items per kilogramme in the mail flows exchanged between the designated operators of Union member countries

The objective of the IPK study is to collect information in support of the work on the development of future proposals for the UPU remuneration system. The collected information will result in a better understanding of the worldwide average composition of mail, according to weight, format and content, for letter-post, parcel-post and EMS items. It will also support the establishment by the POC, as the Regulations require, of the recommended IPK values to be used in order to avoid sampling costs.

The sampling period will be the month of May 2018. For letter-post items, if continuous sampling is carried out, the results split by format for the second quarter of the year (1 April to 30 June 2018) may be provided instead.

The sampling forms are available in Excel format below.


Please return the completed Excel file to the International Bureau by e-mail to paul.schoorl(at) (copy to virginia.espinoza(at) no later than 20 July 2018.

The data will be handled in strict confidence by International Bureau staff who have signed confidentiality/non-disclosure agreements.

Should you have any problems with the sampling procedures described above, please contact:

Remuneration Development Expert
Policy, Regulation and Markets Directorate
+41 31 350 35 91

1. Circular letter 0426(DPRM.REM.RD)1032

Circular letter 0426(DPRM.REM.RD)1032 of 29 March 2018 contains general information in relation to the sampling process.

2. IPK sampling instructions (Annex 1)

Designated operators are requested to follow these instructions carefully when performing sampling of letter-post, parcel-post and EMS items.

3. Country classification (Annex 2)

Contains an overview of the classification of all countries and territories in Groups I to IV in accordance with Congress resolution C 7/2016.

4. List documents and goods (Annex 3)

Contains a list of items that commonly constitute documents and goods.

5. Sampling forms

Download the Excel file and use the forms contained therein when performing sampling of letter-post, parcel-post and EMS items. Return the completed form in electronic format to the IB (see above).

6. Examples of completed sampling forms