Calculation tools
Calculation tools are online proprietary calculation software used to calculate the environmental performance of construction works based on environmental data in the NMD. The calculation tools validated by Stichting NMD for calculating environmental performance are stated below.
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!
The table below shows all calculation tool owners that are currently validated for use in accordance with the Assessment Method for the Environmental Performance of Construction Works, version 1.2 (excluding the optional Chapter 4). The table distinguishes between calculation tools for Buildings and Utilities (B&U) and Civil Engineering (GWW), and between validation for the A1 and A2 sets. This makes it clear for each tool owner which application areas and datasets the validation applies to. This table will be expanded when new or additional calculation methods are introduced.
If an end date is stated for a calculation tool, the validation applies up to and including that date. Calculations carried out with that tool after this date are not validated by the Dutch Environmental Database, regardless of the reference date used. Calculations carried out before the end date remain valid.
Validated calculation tools
| Calculation tool & owner |
Scope | Set | Assessment Method for the Environmental Performance of Construction Works, version 1.2 | Validation | |
|---|---|---|---|---|---|
| B&U | GWW | ||||
| BCI Gebouw Alba Concepts |
V | A1 & A2 | Validated | ||
| Dubocalc Netcompany/ Witteveen+Bos |
V | Not validated for scaling | |||
| GPR Materiaal W/E adviseurs |
V | A1 & A2 | Validated | ||
| Ibis voor Milieu Impact Brink Software |
V | V | A1 & A2 | Validated | |
| Madaster MPG Tool Madaster |
V | V | A1 & A2 | Validated | |
| MPG Toetshulp Bimpact B.V |
V | A1 & A2 | Validated | ||
| MPG Calc 3 DGMR |
V | A1 & A2 | Validated | ||
| MRPI-MPG Tool Stichting MRPI |
V | A1 & A2 | Validated | ||
| WiseBrick WiseBrick |
V | A1 & A2 | Validated |
Click on one of the logos to go to the relevant Calculation tool
What are validated calculation tools?
A validated calculation tool is private calculation software that has been validated by Stichting NMD for the correct and uniform implementation of the Assessment Method(s) and the associated environmental data from the Dutch Environmental Database.
The validated status indicates that the tool has successfully completed the validation procedure and therefore delivers reliable and reproducible environmental performance calculations, ensuring that users obtain the same results for identical input. Validation is carried out in accordance with the Validation Protocol, which sets out the standardised approach for validating calculations and results and safeguards quality and consistency within the environmental performance system. To retain the validated status, tool owners are validated twice a year.
In addition to the validated calculations, a calculation tool may include additional functionalities or calculations. This page specifies for each tool exactly which components and calculations the validation applies to.
Planning
At present, several calculation tool owners are working on the implementation and validation of the optional Chapter 4 calculations (MEPG calculation method). The deadline and release of the MEPG calculation method are scheduled for 1 April 2026. The wlc-gwp calculation method is still under development; once the validation planning is known, this page will be updated.
In addition, since 2 September 2024 the A2 set has been available in most calculation tools alongside the existing A1 set, allowing the market to prepare in a timely manner. The formal introduction of the A2 set (EN 15804+A2) and the . new environmental performance requirements is scheduled for 1 July 2026.
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.
Frequently asked questions 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.
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.
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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