There is now a free, easy-to-use tool available online from Kingspan Insulation for calculating U-values. The mobile- and desktop-friendly calculator, available at, is packed with 6,000 calculations for pitched and flat roofs, walls and floors. Users are not required to register to use the calculator.

Kingspan U-value calculatorKingspan’s calculator, which is the first to feature calculations approved under the BBA/TIMSA competency scheme, walks users through a series of quick questions about the specification. If required, a simple click on the question mark icon will bring up a tooltip box containing plain English advice.

When finished, the calculator will instantly provide a recommended insulation solution and thickness, along with the resulting U-value. The information can then be emailed to the user and a PDF format of the full calculation is also available.

To ensure accuracy, all U-values within the tool have been pre-calculated by a member of Kingspan Insulation’s technical services department, which is approved under the BBA/TIMSA Scheme for Calculation Competency Part 1 – U-value and condensation risk.