TechTools

Thermal Resistance Converter

From
To
Sig. figures:

Kelvin per Watt

K/W

1

Celsius per Watt

°C/W

1

Millikelvin per Watt

mK/W

1000

Square Meter·Kelvin per Watt

m²·K/W (RSI)

1(input)

Square Meter·°C per Watt

m²·°C/W

1

h·°F per BTU

h·°F/BTU

0.527528

h·ft²·°F per BTU (US R-val)

h·ft²·°F/BTU

5.67826

h·m²·°C per kcal

h·m²·°C/kcal

1.16222

°C per kcal/hr

°C/(kcal/h)

1.16222

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Convert thermal resistance (K/W) and R-value (m²·K/W = RSI; h·ft²·°F/BTU = US R). Key: RSI 1 = US R-5.68. Reference: R-13 ≈ RSI 2.29; R-30 ≈ RSI 5.28; double glazing ≈ RSI 0.35. 9 units total. 100% browser-based.

How to Use

  1. 1Type a thermal resistance or R-value (e.g. 1 for RSI 1)
  2. 2Select your starting unit (e.g. m²·K/W for RSI, h·ft²·°F/BTU for US R-value)
  3. 3Select your target unit - the result appears instantly
  4. 4All conversions appear simultaneously across SI, Imperial, and Caloric groups
  5. 5Hover any row to copy or use as input; click ⇄ to swap
  6. 6Adjust Sig. figures and toggle Sci notation as needed
  7. 7Open 'R-value reference' for insulation benchmarks

Features

  • 9 thermal resistance units: K/W, m²·K/W (RSI), h·ft²·°F/BTU (US R), and more
  • Groups: SI/Metric, Imperial/US, Caloric/Legacy
  • Insulation reference table (R-13, R-30, double glazing)
  • Adjustable significant figures and scientific notation toggle
  • One-click copy per result
  • 100% browser-based

Frequently Asked Questions

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