Convert ppm/K to Per Degree Fahrenheit (ppm/K to °F⁻¹)
1 ppm per kelvin (ppm/K) = 5.555555556 × 10⁻⁷ per degree Fahrenheit (°F⁻¹). 1 °F⁻¹ = 1800000 ppm/K. Example: 15 ppm/K = 15 × 5.555555556 × 10⁻⁷ = 0.000008333333333 °F⁻¹.
Also searched as ppm per kelvin to °F⁻¹, ppm per kelvin in °F⁻¹, ppm per kelvin into per degree Fahrenheit, ppm/K to °F⁻¹, ppm/K in per degree Fahrenheit, ppm/K into per degree Fahrenheit, ppm per kelvin to per degree Fahrenheit, ppm/K to per degree Fahrenheit converter and how many per degree Fahrenheit in a ppm per kelvin.
1 ppm/K = 5.555555556e-7 °F⁻¹
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ppm per kelvin to per degree Fahrenheit converter to paste a column from Excel.
How to Convert ppm/K to Per Degree Fahrenheit
- 1 ppm/K = 5.555555556 × 10⁻⁷ °F⁻¹
- 1 °F⁻¹ = 1800000 ppm/K
- Example: convert 15 ppm/K to °F⁻¹: 15 ppm/K = 15 × 5.555555556 × 10⁻⁷ °F⁻¹ = 0.000008333333333 °F⁻¹
Formula
°F⁻¹ = ppm/K ÷ 1800000
Derivation from SI units:
- 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm/(m·K) = 1 µm/(m·°C)
- A Fahrenheit degree is 5/9 of a kelvin, so 1/°F = 1.8/K (exact)
- 1 ppm/K = 0.000001 K⁻¹ ÷ 1.8 K⁻¹ per °F⁻¹ = 5.555555555556 × 10⁻⁷ °F⁻¹
Both units are defined exactly, so the factor is exact. ppm/K definition: ppm per kelvin; Per Degree Fahrenheit definition: per degree Fahrenheit.
Worked examples
- A reading of 9 ppm/K converts to 0.000005 °F⁻¹.
9 ppm/K × 5.555555556 × 10⁻⁷ = 0.000005 °F⁻¹ - A value of 17.3 ppm/K is 0.000009611111111 °F⁻¹.
17.3 ppm/K × 5.555555556 × 10⁻⁷ = 0.000009611111111 °F⁻¹
ppm/K to Per Degree Fahrenheit conversion table
| ppm/K | Per Degree Fahrenheit (°F⁻¹) |
|---|---|
| 0.5 ppm/K | 2.777777778 × 10⁻⁷ °F⁻¹ |
| 1 ppm/K | 5.555555556 × 10⁻⁷ °F⁻¹ |
| 3 ppm/K | 0.000001666666667 °F⁻¹ |
| 4 ppm/K | 0.000002222222222 °F⁻¹ |
| 9 ppm/K | 0.000005 °F⁻¹ |
| 12 ppm/K | 0.000006666666667 °F⁻¹ |
| 13 ppm/K | 0.000007222222222 °F⁻¹ |
| 16.5 ppm/K | 0.000009166666667 °F⁻¹ |
| 17.3 ppm/K | 0.000009611111111 °F⁻¹ |
| 23.1 ppm/K | 0.00001283333333 °F⁻¹ |
| 50 ppm/K | 0.00002777777778 °F⁻¹ |
| 100 ppm/K | 0.00005555555556 °F⁻¹ |
Where it's used
ppm/K are used for material datasheets for metals, ceramics and polymers, while per degree Fahrenheit appear in US piping and structural codes (ASME B31, AISC). Both measure coefficient of thermal expansion (α, CTE), so the conversion is a fixed factor.
ppm/K to other thermal expansion coefficient units
| Conversion | 1 ppm/K equals |
|---|---|
| ppm per kelvin to per degree Fahrenheit | 5.555555556 × 10⁻⁷ °F⁻¹ |
| ppm per kelvin to per kelvin | 0.000001 K⁻¹ |
| ppm per kelvin to per degree Celsius | 0.000001 °C⁻¹ |
| ppm per kelvin to ppm per degree Fahrenheit | 0.5555555556 ppm/°F |
Frequently asked questions
How many per degree Fahrenheit are in 1 ppm per kelvin?
1 ppm/K = 5.555555556 × 10⁻⁷ °F⁻¹.
How do I convert ppm per kelvin to per degree Fahrenheit?
Multiply the value in ppm/K by 5.555555556 × 10⁻⁷, or divide it by 1800000. For example, 15 ppm/K × 5.555555556 × 10⁻⁷ = 0.000008333333333 °F⁻¹.
Is the ppm/K to °F⁻¹ 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 ppm/K to Per Degree Fahrenheit (ppm/K to °F⁻¹). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/ppm-per-kelvin-to-per-degree-fahrenheit/
IEEE
Scientific Converters, "Convert ppm/K to Per Degree Fahrenheit (ppm/K to °F⁻¹)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/ppm-per-kelvin-to-per-degree-fahrenheit/