Convert Per Kelvin to ppm/°F (K⁻¹ to ppm/°F)
1 per kelvin (K⁻¹) = 555555.5556 ppm per degree Fahrenheit (ppm/°F). 1 ppm/°F = 0.0000018 K⁻¹. Example: 15 K⁻¹ = 15 × 555555.5556 = 8333333.333 ppm/°F.
Also searched as per kelvin to ppm/°F, per kelvin in ppm/°F, per kelvin into ppm per degree Fahrenheit, K⁻¹ to ppm/°F, K⁻¹ in ppm per degree Fahrenheit, K⁻¹ into ppm per degree Fahrenheit, per kelvin to ppm per degree Fahrenheit, K⁻¹ to ppm per degree Fahrenheit converter and how many ppm per degree Fahrenheit in a per kelvin.
1 K⁻¹ = 555555.5556 ppm/°F
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk per kelvin to ppm per degree Fahrenheit converter to paste a column from Excel.
How to Convert Per Kelvin to ppm/°F
- 1 K⁻¹ = 555555.5556 ppm/°F
- 1 ppm/°F = 0.0000018 K⁻¹
- Example: convert 15 K⁻¹ to ppm/°F: 15 K⁻¹ = 15 × 555555.5556 ppm/°F = 8333333.333 ppm/°F
Formula
ppm/°F = K⁻¹ × 555555.5555556
Derivation from SI units:
- The SI unit of the coefficient of thermal expansion: relative change in length (m/m) per kelvin
- 1 ppm/°F = 10⁻⁶ /°F = 1.8 × 10⁻⁶ K⁻¹ = 1 µin/(in·°F)
Both units are defined exactly, so the factor is exact. Per Kelvin definition: per kelvin; ppm/°F definition: ppm per degree Fahrenheit.
Worked examples
- A reading of 0.000012 K⁻¹ converts to 6.666666667 ppm/°F.
0.000012 K⁻¹ × 555555.5556 = 6.666666667 ppm/°F - A value of 0.00005 K⁻¹ is 27.77777778 ppm/°F.
0.00005 K⁻¹ × 555555.5556 = 27.77777778 ppm/°F
Per Kelvin to ppm/°F conversion table
| Per Kelvin (K⁻¹) | ppm/°F |
|---|---|
| 0.0000005 K⁻¹ | 0.2777777778 ppm/°F |
| 0.000001 K⁻¹ | 0.5555555556 ppm/°F |
| 0.000009 K⁻¹ | 5 ppm/°F |
| 0.000012 K⁻¹ | 6.666666667 ppm/°F |
| 0.000017 K⁻¹ | 9.444444444 ppm/°F |
| 0.0000231 K⁻¹ | 12.83333333 ppm/°F |
| 0.00005 K⁻¹ | 27.77777778 ppm/°F |
| 0.0001 K⁻¹ | 55.55555556 ppm/°F |
| 0.00021 K⁻¹ | 116.6666667 ppm/°F |
| 0.001 K⁻¹ | 555.5555556 ppm/°F |
Where it's used
Per Kelvin are used for linear expansion ΔL = α L ΔT, while ppm per degree Fahrenheit appear in US material and alloy datasheets. Both measure coefficient of thermal expansion (α, CTE), so the conversion is a fixed factor.
Per Kelvin to other thermal expansion coefficient units
| Conversion | 1 K⁻¹ equals |
|---|---|
| per kelvin to ppm per degree Fahrenheit | 555555.5556 ppm/°F |
| per kelvin to ppm per kelvin | 1000000 ppm/K |
| per kelvin to per degree Celsius | 1 °C⁻¹ |
| per kelvin to per degree Fahrenheit | 0.5555555556 °F⁻¹ |
Frequently asked questions
How many ppm per degree Fahrenheit are in 1 per kelvin?
1 K⁻¹ = 555555.5556 ppm/°F.
How do I convert per kelvin to ppm per degree Fahrenheit?
Multiply the value in K⁻¹ by 555555.5556. For example, 15 K⁻¹ × 555555.5556 = 8333333.333 ppm/°F.
Is the K⁻¹ to ppm/°F conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, degree Celsius.
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "degree Fahrenheit".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Per Kelvin to ppm/°F (K⁻¹ to ppm/°F). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/per-kelvin-to-ppm-per-degree-fahrenheit/
IEEE
Scientific Converters, "Convert Per Kelvin to ppm/°F (K⁻¹ to ppm/°F)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/per-kelvin-to-ppm-per-degree-fahrenheit/