Calculation tools

Since 2 September 2024, the A2 set has been available alongside the A1 set in calculation tools, so that the market can prepare for the transition to calculating with set A2. The official introduction of the new A2 set (EN 15804+A2) and its environmental performance requirements is now foreseen on January 1, 2026, this is subject to outcomes of the legislative process. This will give the sector sufficient time to prepare for the use of the A2 set.

Please note that this information is updated regularly!

Validated calculation tools

Calculation tool	Tool Owner
		B&U	GWW	A1	A2
BCI Gebouw	Alba Concepts	V		V	V
Dubocalc	Netcompany/ Witteveen+Bos		V	V
GPR Materiaal	W/E adviseurs	V		V	V
Ibis voor Milieu Impact	Brink Software	V	V	V	V
Madaster MPG Tool	Madaster	V	V	V	V
MPG Toetshulp	Bimpact B.V	V		V	V
MPGcalc	DGMR	V		V	V
MRPI-MPG Tool	Stichting MRPI	V		V
WiseBrick	WiseBrick	V		V	V

Click on one of the logos to go to the relevant Calculation tool

Completeness check

Within the element structure of the NMD, a distinction is made between mandatory and optional components within elements. A mandatory function of, for example, a structural floor is the floor itself; this must always be entered into the calculation tool. The paintwork, also a function within the element 'floors, structural', is optional. In the validated calculation tools, a completeness check at construction work level is automatically carried out. When a function is incomplete, the user of the calculation tool is required to complete it.

Stichting NMD is the administrator of the informative classification of functions, but currently does not actively manage it. As a result, it has become clear that it is not possible to guarantee that the completeness check is carried out correctly in practice. For this reason, Stichting NMD has decided to suspend the implementation of the completeness check in the calculation tools. In the meantime, Stichting NMD is working on a review and possible update of the informative classification of mandatory and optional functions.

Validation and licencing

Before receiving the ‘validated’ stamp, the calculation tools must be verified using a validation procedure; the NMD software validation guidelines. Stichting NMD uses this validation procedure to check whether the calculation rules have been used and whether the Assessment Method and the NMD have been implemented properly in the software.

After validation, the software developer and Stichting NMD sign a licencing agreement. Licencing entitles the software developer to apply the environmental data, for which there is a charge. The next step is to publish the validated calculation tool on the market, where the software developer become an instrument owner. Stichting NMD ensures that information about the instrument is included in the list at the top of this page.

Go to overview Environmental Performance

Does the NMD have its own calculation tools?

No, calculation tools are online proprietary calculation software used to calculate the environmental performance of construction works based on environmental data in the NMD. Stichting NMD has formulated calculation rules to clarify and control how the Assessment Method should be converted into a digital instrument. The rules ensure that the calculation tools use a uniform calculation, which provides an unambiguous result for the environmental performance of buildings.

I am a calculation tool owner and would like to use the NMD. What do I need to do?

Before receiving the stamp ‘validated,’ the calculation tool must be verified using a validation procedure. The NMD software validation guidelines. Based on this validation procedure, the NMD Foundation tests whether the calculation rules have been used and whether the Assessment method and the NMD have been properly implemented in the software.
For the use of the entire database there is a one-time entrance fee and in addition annual license fees are charged for the use and for updates of the NMD.

How does one go from a LCA/EPD to an MKI/MPG?

After drawing up an LCA and EPD these data can be added to the NMD, after verification. The environmental data in the NMD are used by several private companies that have developed calculation tools to make an Environmental Cost Calculation (ECI) or Environmental Performance of Buildings calculation. ECI and Environmental Performance of Buildings values can therefore only be made transparent using the calculation tools.

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