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Thermal Resistance

K/Wto°F·s/BTU

Convert kelvins per watt (K/W) to Fahrenheit-seconds per British thermal unit (°F·s/BTU).

Factor1 K/W = 1899.101 °F·s/BTU

Converter

K/W

Accepts numbers or expressions, e.g. 150 + 14.7

Result
1899.1°F·s/BTU

Rendered to 6 significant figures.

Formula

Formula
°F·s/BTU = K/W × 1899.101

Multiply any value in kelvins per watt by 1899.101 to obtain the value in Fahrenheit-seconds per British thermal unit.

Worked example

Convert 1 K/W to °F·s/BTU.

  1. 01Start with 1 K/W.
  2. 02Multiply by the conversion factor: 1 × 1899.101 = 1899.1 °F·s/BTU.
Result1 K/W = 1899.1 °F·s/BTU

Conversion table

K/W°F·s/BTU
11899.1
23798.2
59495.5
1018991
2037982
5094955
1001.8991e+5
2003.7982e+5
5009.4955e+5
10001.8991e+6

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from K/W to °F·s/BTU?
1 K/W equals 1899.101 °F·s/BTU. To convert, multiply the value in kelvins per watt by 1899.101.
How do I convert 1 K/W to °F·s/BTU?
1 K/W = 1899.1 °F·s/BTU. For any value, multiply by 1899.101.
How do I convert °F·s/BTU back to K/W?
Divide by the same factor — or equivalently, multiply by 0.0005265651. So 1 °F·s/BTU = 0.000526565 K/W.
When would I need to convert kelvin per watt to Fahrenheit-second per British thermal unit?
Thermal-resistance conversions between K/W and °F·s/BTU appear in electronics cooling (heat-sink and TIM datasheets), transformer, motor and generator thermal-rise calculations, lumped-element R-C thermal-network modelling, and transient heat-transfer analysis. K/W and °C/W are the SI standard; mK/W and µK/W cover sub-SI heat-sink and TIM datasheet ladders; K/kW and K/MW cover large-equipment and power-plant notation; °F·h/BTU and °F·s/BTU are the US convention. This category is lumped thermal resistance only — it does NOT include area-normalized R-value (m²·K/W), thermal-conductivity inverse with geometry, or U-value calculations, all of which are different physical quantities.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).

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