21 BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin
Quick answer
21 BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) equals
3.028786 W/(m·K)
To convert 21 BTU-Inch/Hour-sq Foot-°Fs to Watt/Meter-Kelvins, multiply by 0.1442278889. Therefore, 21 BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) equals 3.028786 Watt/Meter-Kelvin (W/(m·K)).
Formula: W/(m·K) = BTU·in/(h·ft²·°F) × 0.1442278889. Calculation: 21 × 0.1442278889 = 3.028786 W/(m·K).
Convert BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) to Watt/Meter-Kelvin (W/(m·K)) online with our free unit converter. In thermal conductivity, 1 BTU·in/(h·ft²·°F) = 0.144228 W/(m·K). Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin
- Step 1 — start with the formula. W/(m·K) = BTU·in/(h·ft²·°F) × 0.1442278889
- Step 2 — substitute your figure. 21 BTU·in/(h·ft²·°F) × 0.1442278889
- Step 3 — read the result. 21 BTU·in/(h·ft²·°F) = 3.028786 W/(m·K)
- Step 4 — check it in reverse. BTU·in/(h·ft²·°F) = W/(m·K) × 6.9334717968 returns 21 BTU·in/(h·ft²·°F), which matches the figure you started with.
Thermal Conductivity Converter
7 units available
21 BTU·in/(h·ft²·°F) = 3.028786 W/(m·K)
Formula:
W/(m·K) = BTU·in/(h·ft²·°F) × 0.1442278889With your value: 21 BTU·in/(h·ft²·°F) = 3.02878567 W/(m·K)
Other BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin conversions
BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin Conversion Table
| BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) | Watt/Meter-Kelvin (W/(m·K)) |
|---|---|
| 0.5 | 0.072114 |
| 1 | 0.144228 |
| 2 | 0.288456 |
| 5 | 0.721139 |
| 10 | 1.442279 |
| 15 | 2.163418 |
| 20 | 2.884558 |
| 25 | 3.605697 |
| 50 | 7.211394 |
| 100 | 14.422789 |
| 250 | 36.056972 |
| 500 | 72.113944 |
| 1000 | 144.227889 |
Watt/Meter-Kelvin to BTU-Inch/Hour-sq Foot-°F Conversion Table
| Watt/Meter-Kelvin (W/(m·K)) | BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) |
|---|---|
| 0.5 | 3.466736 |
| 1 | 6.933472 |
| 2 | 13.866944 |
| 5 | 34.667359 |
| 10 | 69.334718 |
| 15 | 104.002077 |
| 20 | 138.669436 |
| 25 | 173.336795 |
| 50 | 346.67359 |
| 100 | 693.34718 |
| 250 | 1,733.367949 |
| 500 | 3,466.735898 |
| 1000 | 6,933.471797 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F))
Thermal Conductivity
Derived quantity, watt per metre-kelvin (W/(m·K)). Imperial and calorie-based units convert exactly via the thermochemical calorie and the international BTU.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
Watt/Meter-Kelvin (W/(m·K))
Thermal Conductivity
Derived quantity, watt per metre-kelvin (W/(m·K)). Imperial and calorie-based units convert exactly via the thermochemical calorie and the international BTU.
Source: NIST Special Publication 811, Guide for the Use of the International System of Units
National Institute of Standards and Technology (US) · Reviewed 2026-07-01
How to Convert BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin
To convert from BTU-Inch/Hour-sq Foot-°F (BTU·in/(h·ft²·°F)) to Watt/Meter-Kelvin (W/(m·K)), multiply the value by 0.1442278889.
Formula: W/(m·K) = BTU·in/(h·ft²·°F) × 0.1442278889
Reverse: BTU·in/(h·ft²·°F) = W/(m·K) × 6.9334717968
Step-by-Step Example
- Start with your value in BTU-Inch/Hour-sq Foot-°F. For example: 5 BTU·in/(h·ft²·°F)
- Multiply by the conversion factor: 5 x 0.1442278889
- The result is: 0.721139 W/(m·K)
BTU-Inch/Hour-sq Foot-°F and Watt/Meter-Kelvin Relationship
This conversion bridges the US Customary / Imperial and Metric (SI) measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 BTU-Inch/Hour-sq Foot-°F represents a fraction of a Watt/Meter-Kelvin (1 Watt/Meter-Kelvin ≈ 6.9335 BTU-Inch/Hour-sq Foot-°Fs), the Watt/Meter-Kelvin is the larger measurement interval. Understanding the relationship between BTU-Inch/Hour-sq Foot-°F and Watt/Meter-Kelvin is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About BTU-Inch/Hour-sq Foot-°F
The BTU-Inch/Hour-sq Foot-°F (symbol: BTU·in/(h·ft²·°F)) is a recognized unit in the US Customary / Imperial measurement framework, utilized within thermal conductivity applications for precision and standardized data representation.
Common uses of BTU-Inch/Hour-sq Foot-°F: thermal conductivity calculations, engineering and science, education.
About Watt/Meter-Kelvin
The Watt/Meter-Kelvin (symbol: W/(m·K)) is a recognized unit in the Metric (SI) measurement framework, utilized within thermal conductivity applications for precision and standardized data representation.
Common uses of Watt/Meter-Kelvin: thermal conductivity calculations, engineering and science, education.
Frequently Asked Questions
- What is 21 BTU-Inch/Hour-sq Foot-°F in Watt/Meter-Kelvin?
- 21 BTU-Inch/Hour-sq Foot-°F equals 3.028786 Watt/Meter-Kelvin.
- How many Watt/Meter-Kelvins are in 1 BTU-Inch/Hour-sq Foot-°F?
- There are exactly 0.1442278889 Watt/Meter-Kelvins in 1 BTU-Inch/Hour-sq Foot-°F. This means the conversion factor from BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin is 0.1442278889.
- What is the formula to convert BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin?
- The formula to convert BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin is: W/(m·K) = BTU·in/(h·ft²·°F) × 0.1442278889. For example, to convert 10 BTU-Inch/Hour-sq Foot-°Fs to Watt/Meter-Kelvins, you would multiply 10 by 0.1442278889.
- What is a BTU-Inch/Hour-sq Foot-°F?
- The BTU-Inch/Hour-sq Foot-°F (symbol: BTU·in/(h·ft²·°F)) is a recognized unit in the US Customary / Imperial measurement framework, utilized within thermal conductivity applications for precision and standardized data representation.
- What is a Watt/Meter-Kelvin?
- The Watt/Meter-Kelvin (symbol: W/(m·K)) is a recognized unit in the Metric (SI) measurement framework, utilized within thermal conductivity applications for precision and standardized data representation.
- What are the common uses of BTU-Inch/Hour-sq Foot-°F?
- The BTU-Inch/Hour-sq Foot-°F is commonly used in thermal conductivity calculations, engineering and science, education.
Related Thermal Conductivity Conversions
Cite this page
UnitConvertLab. (2026). 21 BTU-Inch/Hour-sq Foot-°F to Watt/Meter-Kelvin. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/21-btu_in_per_h_ft2_f-to-watt_per_meter_k