R-Value to U-Value Converter

Translate thermal resistance (R-value) into thermal transmittance (U-value) to compare insulation materials.

Use results for guidance only; actual performance may vary.

Examples

  • R-10 ⇒ 0.10 U
  • R-15 ⇒ 0.07 U
  • R-20 ⇒ 0.05 U

FAQ

What is an R-value?

It measures how well a material resists heat flow. Review the [thermal conductivity guide](/units-and-measures/thermal-conductivity-heat-conduction/) to see how λ, R-value, and U-value connect across materials.

Why convert to U-value?

Some codes specify maximum U-values instead of R-values.

Does higher R-value mean lower U-value?

Yes, they are inversely related.

Additional Information

  • Result unit: U

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