Thermal insulance (R-value) converter
Convert thermal insulance (r-value) across supported units. Compare equivalent values using the stated physical definitions.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Value | Enter value using the definition in the method and example. |
| From | Select the unit or currency in which the entered number is currently expressed. |
| To | Select the unit or currency you need for the answer. |
Understanding your result
The converted value describes the same thermal insulance quantity in the selected target unit. Display rounding does not add precision to the original measurement.
Common mistakes
- Confusing the source and target units, or overlooking a prefix or case-sensitive symbol.
Check your calculation
- Convert to the target unit and then reverse the direction. Within display rounding, you should recover the original value.
Read the thermal insulance measurement guide · Calculation checks, sources and review limits
How do I express thermal insulance (r-value) in another unit?
Enter the known measurement and select its source and target units. The converter expresses the same thermal insulance (r-value) quantity in the target unit, using the stated definitions.
Common uses
- Compare measurements stated in different units.
- Translate a known value before using it in a formula or specification.
How it works
Convert through the shared base quantity using the two defined factors. Area-normalized resistance. Clo verified by NIST; tog is dimensional 0.1 m² K/W but requires additional primary-source confirmation before publication. Conversion changes the unit of a known measurement; it does not calculate another physical quantity or imply a material model. Factors with π or repeating rational values use finite precision; results display up to 12 significant digits.
Worked example
10 m²·K/W equals approximately 64.5161290323 clo. Reverse the units to convert in the other direction.