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Thermal Resistance

°F·s/BTUtoK/W

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

Factor1 °F·s/BTU = 0.0005265651 K/W

Converter

°F·s/BTU

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

Result
0.526565K/W

Rendered to 6 significant figures.

Formula

Formula
K/W = °F·s/BTU × 0.0005265651

Multiply any value in Fahrenheit-seconds per British thermal unit by 0.0005265651 to obtain the value in kelvins per watt.

Worked example

Convert 1000 °F·s/BTU to K/W.

  1. 01Start with 1000 °F·s/BTU.
  2. 02Multiply by the conversion factor: 1000 × 0.0005265651 = 0.526565 K/W.
Result1000 °F·s/BTU = 0.526565 K/W

Conversion table

°F·s/BTUK/W
10.00052657
20.0010531
50.0026328
100.0052657
200.010531
500.026328
1000.052657
2000.10531
5000.26328
10000.52657

Reference values rounded to 5 significant figures for display.

FAQ

What is the conversion factor from °F·s/BTU to K/W?
1 °F·s/BTU equals 0.0005265651 K/W. To convert, multiply the value in Fahrenheit-seconds per British thermal unit by 0.0005265651.
How do I convert 1 °F·s/BTU to K/W?
1 °F·s/BTU = 0.000526565 K/W. For any value, multiply by 0.0005265651.
How do I convert K/W back to °F·s/BTU?
Divide by the same factor — or equivalently, multiply by 1899.101. So 1 K/W = 1899.1 °F·s/BTU.
When would I need to convert Fahrenheit-second per British thermal unit to kelvin per watt?
Thermal-resistance conversions between °F·s/BTU and K/W 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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