Fizyka Budowli
Narzędzie do szybkiej analizy cieplnej przegród
Lambda Calculator
Wybierz material, wpisz grubosc warstwy i policz parametry cieplne calej przegrody. Narzedzie dziala bez instalacji i mozna je od razu opublikowac jako strone internetowa.
Obliczenia warstwowe
Eksport PDF / Excel
Publikacja online
Zakres
Sciany, dachy, podlogi, stropy
Jedno miejsce do doboru materialu, grubosci i sprawdzenia U.
Thermal Conductivity and U-Value Calculator
Lambda Calculator helps you estimate thermal conductivity, layer resistance, and final U-value for walls, roofs, floors, slabs, and other layered building assemblies. It is designed for quick thermal checks during concept design, insulation comparison, and envelope optimisation.
You can choose materials from a large database, edit lambda values manually, compare insulation products at a selected thickness, and export the result as CSV, Excel, or PDF. The calculator is available in multiple languages and works directly in the browser without installation.
Why this calculator is useful
Built for fast checks, reporting, and practical early-stage decisions.
Walls, roofs, and floors
Model layered building assemblies and compare thermal performance across common envelope elements.
Report-ready output
Print or export a clean summary with material layers, resistance values, and project metadata.
Insulation comparison
Compare materials by lambda, resistance, and thickness to quickly shortlist the best options.
Practical guide
How to read lambda, R, and U
The three numbers describe different parts of the same thermal story. Lambda belongs to the material, R belongs to the layer, and U belongs to the whole assembly.
Start with the material
Check the lambda value first. Lower lambda usually means a better insulating material, but the final result still depends on thickness and placement in the build-up.
Then look at the layer
Thermal resistance increases when thickness goes up and lambda goes down. That is why the same material can behave very differently in two assemblies.
Finally check the whole assembly
The U-value is the final number you use for the full wall, roof, or floor. It includes every layer plus the surface resistances at both sides.
What to check before you export
- The layer order matches the real construction.
- Every material has a realistic lambda value.
- Junctions, edges, and openings are considered in the detail design.
- The target U-value is realistic for the project and climate.
- The exported result includes the right project name and units.
Budowa Przegrody
Dodawaj warstwy, wybieraj materialy i aktualizuj wyniki na zywo.
Opory Przejmowania Ciepla
Wyniki
Zestawienie sumaryczne i tabela warstw do wydruku lub eksportu.
| Warstwa | Kategoria | Material | Grubosc | Lambda | R |
|---|
Ad space
Advertising area. Add your AdSense publisher and slot IDs to activate ads.
Insulation Comparison
Insulation Comparison
A dedicated page to choose a category, thickness, and materials, then compare their parameters in more detail.
1. Choose a category
Focus on wall, roof, floor, or other insulation materials based on the project needs.
2. Set thickness and target
Define the comparison thickness and the target thermal resistance for the case.
3. Read the ranking
Check lambda, resistance, and thickness to reach target, then choose the best option.
Porownanie Izolacji
Wybierz kategorie, grubosc i materialy, aby porownac je bardziej szczegolowo.
Wybierz materialy do porownania
| Pozycja | Material | Kategoria | Lambda | R dla wybranej grubosci | Thickness for target R | Performance | Zastosowanie |
|---|
Wzory
R = d / lambda
U = 1 / (Rsi + suma(R warstw) + Rse)
Uwagi
Grubosc wpisujesz w milimetrach, a kalkulator przelicza ja na metry.
Wartosci lambda w bazie sa orientacyjne. Do projektu wykonawczego trzeba potwierdzic je w kartach technicznych producenta.
FAQ
Standalone FAQWhat is lambda?
Lambda is the thermal conductivity of a material in W/mK. Lower values usually mean better thermal insulation.
What is U-value?
U-value describes how much heat passes through a building element. Lower U-values indicate better thermal performance of the full assembly.
Can I compare materials?
Yes. Use the comparison section to choose a category, set a thickness, and compare materials by lambda and calculated thermal resistance.
Can I print or export the result?
Yes. You can print the result or export it to CSV, Excel, or PDF for reporting and documentation.
Does the calculator work for walls, roofs, and floors?
Yes. It is designed for layered assemblies such as external walls, flat roofs, pitched roofs, floors, and slabs.
Is the calculator suitable for quick design checks?
Yes. It is intended for fast concept-stage calculations, insulation comparison, and envelope optimisation before detailed design.
Can I switch thickness units?
Yes. You can switch between millimeters, centimeters, and inches, and the calculator updates the values consistently.
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