Convert ppm/K to ppm/°F
1 ppm per kelvin (ppm/K) = 0.5555555556 ppm per degree Fahrenheit (ppm/°F). 1 ppm/°F = 1.8 ppm/K. Example: 12 ppm/K = 12 × 0.5555555556 = 6.666666667 ppm/°F.
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1 ppm/K = 0.5555555556 ppm/°F
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ppm per kelvin to ppm per degree Fahrenheit converter to paste a column from Excel.
How to Convert ppm/K to ppm/°F
- 1 ppm/K = 0.5555555556 ppm/°F
- 1 ppm/°F = 1.8 ppm/K
- Example: convert 12 ppm/K to ppm/°F: 12 ppm/K = 12 × 0.5555555556 ppm/°F = 6.666666667 ppm/°F
Formula
ppm/°F = ppm/K × 0.5555555555556
or ppm/°F = ppm/K ÷ 1.8
Derivation from SI units:
- 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm/(m·K) = 1 µm/(m·°C)
- 1 ppm/°F = 10⁻⁶ /°F = 1.8 × 10⁻⁶ K⁻¹ = 1 µin/(in·°F)
- 1 ppm/K = 0.000001 K⁻¹ ÷ 0.0000018 K⁻¹ per ppm/°F = 0.5555555555556 ppm/°F
Both units are defined exactly, so the factor is exact. ppm/K definition: ppm per kelvin; ppm/°F definition: ppm per degree Fahrenheit.
Worked examples
- Carbon steel at about 12 ppm/K is 6.666666667 ppm/°F.
12 ppm/K × 0.5555555556 = 6.666666667 ppm/°F - Aluminium at 23.1 ppm/K is 12.83333333 ppm/°F.
23.1 ppm/K × 0.5555555556 = 12.83333333 ppm/°F
ppm/K to ppm/°F conversion table
| ppm/K | ppm/°F |
|---|---|
| 0.5 ppm/K | 0.2777777778 ppm/°F |
| 1 ppm/K | 0.5555555556 ppm/°F |
| 3 ppm/K | 1.666666667 ppm/°F |
| 4 ppm/K | 2.222222222 ppm/°F |
| 9 ppm/K | 5 ppm/°F |
| 12 ppm/K | 6.666666667 ppm/°F |
| 13 ppm/K | 7.222222222 ppm/°F |
| 16.5 ppm/K | 9.166666667 ppm/°F |
| 17.3 ppm/K | 9.611111111 ppm/°F |
| 23.1 ppm/K | 12.83333333 ppm/°F |
| 50 ppm/K | 27.77777778 ppm/°F |
| 100 ppm/K | 55.55555556 ppm/°F |
Where it's used
Expansion coefficients in ppm/K (µm/m·K) from SI datasheets are converted to ppm/°F (µin/in·°F) for US piping, structural and machine design. Divide by 1.8.
ppm/K to other thermal expansion coefficient units
| Conversion | 1 ppm/K equals |
|---|---|
| ppm per kelvin to ppm per degree Fahrenheit | 0.5555555556 ppm/°F |
| 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 per degree Fahrenheit | 5.555555556 × 10⁻⁷ °F⁻¹ |
Frequently asked questions
Why is the °F value smaller?
A Fahrenheit degree is only 5/9 of a kelvin, so a material expands less per °F: divide the per-kelvin value by 1.8.
How many ppm per degree Fahrenheit are in 1 ppm per kelvin?
1 ppm/K = 0.5555555556 ppm/°F.
How do I convert ppm per kelvin to ppm per degree Fahrenheit?
Multiply the value in ppm/K by 0.5555555556, or divide it by 1.8. For example, 12 ppm/K × 0.5555555556 = 6.666666667 ppm/°F.
Is the ppm/K 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 ppm/K to ppm/°F. Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/ppm-per-kelvin-to-ppm-per-degree-fahrenheit/
IEEE
Scientific Converters, "Convert ppm/K to ppm/°F," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/ppm-per-kelvin-to-ppm-per-degree-fahrenheit/