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U-Value Calculator

Calculate total thermal resistance and U-value for a layered building element.

How it works

Calculate total thermal resistance and U-value for a layered building element.

Formula:
Rtotal = Rsi + Σ(d / λ) + Rse; U = 1 / Rtotal.

Before you use the result: Do not use simplified thermal or moisture estimates as a substitute for a complete building-physics assessment.

Practical use

Use verified material data and project geometry. Treat results as planning estimates and compare them with the energy/thermal requirements that apply to the project.

Keep units consistent with the source information.
Use project-specific densities, pack sizes and coverage rates where provided.
Round purchasing quantities to supplier packaging and delivery rules.

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