Downloadable version
Calculates U-values according to the latest appropriate European standards and other documents. Covers most types of building element, except those that need to be assessed by detailed numerical analysis. Selects the correct method and the appropriate inputs according to the type of element being assessed. Changes to the data are immediately reflected in the calculated U-value, so that the effect of different options is readily assessed. This program does not do dew-point calculations.

Runs on PCs only - not compatible with MACs.

This new version also runs on Windows 10. If you want to update your U-value tool just log on to “Your account” and re-download the software.

Related document: BR443 Conventions for U-value calculations (2019 edition)

A site licence (for 5+ computers) is also available.