Welcome to U-Wert Rechner, your reliable online tool for calculating U-values (thermal transmittance) — the key metric for assessing heat loss through building components such as walls, roofs, windows, and floors.
Our mission is to make energy-efficient building design simple, precise, and accessible to professionals and homeowners alike. Whether you’re an architect, engineer, energy consultant, or DIY builder, U-Wert Rechner helps you calculate and understand thermal performance with just a few clicks.
With growing demands for sustainable construction and stricter energy regulations, accurate U-value calculations are more important than ever. That’s why we built our platform to deliver click here fast, accurate, and standards-compliant results, following European and international norms for building physics.