Logged in you can make a note at each device type and save it at the device type.



producer price index

You can change the producer price index by selecting the desired year. By selecting it, the average new values are recalculated in all unit sizes and their derived values. Information about the average new value can be found in the basic information in chapter 5.




Enter the parameter to be interpolated into the first field. The primary characteristic quantity is always the first column after the device size key.

Choose a size between the smallest and the largest characteristic quantity. The interpolated row is displayed in the table.

In the second field a suggestion for a device size key is automatically displayed, if it can be derived from the primary characteristic quantity. If it cannot be derived, enter it individually and confirm your entry again by clicking "calculate".



Specify additional equipment and devices

By marking a device size in the first column of the device size table, you can display the additional equipment and devices valid for this size. The key of the ZA and ZG is automatically adjusted to the selected device size.

Please note that you can only add additional equipment and devices to "My Devices" if you have saved the assigned device size before.

You can click on "Reset selection" to display all additional equipment and devices again.



Time value of construction equipment

On the My Devices page, you can calculate a time value for your saved device types. To do so, enter the technical condition and the year of construction of the device as well as the desired time of calculation of the current value in the form MM.YYYY in the two fields. The values necessary for the calculation will be determined accordingly. Information on the formula can be found in "Chapter 10. Time value of construction equipment" in the Basic Information.

Important: Time value can be calculated back till the year of construction 1971.

Please note that the producer price index set via the select box on the page is not relevant for the calculation of the time value.

calculation of depreciation and interest as well as of the repair costs of the digital products


Dear users of the BGL,

from 16.03.2017 onwards, the calculation of depreciation and interest as well as of the repair costs of the digital products in the BGL will be subject to adaptation. Unfortunately, the implementation of the online version has produced an imprecision which we have now corrected in accordance with the formulas presented in the basic information.

Rounding up and rounding down operations may, in single cases, still lead to minor deviations in the depreciation and interest values and in the repair costs. Please note that these values will then be different from those in the book version!

Therefore, we would like to apologize for any inconvenience caused to users of the BGL. We are nevertheless confident that you too will benefit from this correction.