Convert Per Degree Fahrenheit to ppm/K (°F⁻¹ to ppm/K)
1 per degree Fahrenheit (°F⁻¹) = 1800000 ppm per kelvin (ppm/K). 1 ppm/K = 5.555555556 × 10⁻⁷ °F⁻¹. Example: 15 °F⁻¹ = 15 × 1800000 = 27000000 ppm/K.
Also searched as per degree Fahrenheit to ppm/K, per degree Fahrenheit in ppm/K, per degree Fahrenheit into ppm per kelvin, °F⁻¹ to ppm/K, °F⁻¹ in ppm per kelvin, °F⁻¹ into ppm per kelvin, per degree Fahrenheit to ppm per kelvin, °F⁻¹ to ppm per kelvin converter and how many ppm per kelvin in a per degree Fahrenheit.
1 °F⁻¹ = 1800000 ppm/K
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk per degree Fahrenheit to ppm per kelvin converter to paste a column from Excel.
How to Convert Per Degree Fahrenheit to ppm/K
- 1 °F⁻¹ = 1800000 ppm/K
- 1 ppm/K = 5.555555556 × 10⁻⁷ °F⁻¹
- Example: convert 15 °F⁻¹ to ppm/K: 15 °F⁻¹ = 15 × 1800000 ppm/K = 27000000 ppm/K
Formula
ppm/K = °F⁻¹ × 1800000
Derivation from SI units:
- A Fahrenheit degree is 5/9 of a kelvin, so 1/°F = 1.8/K (exact)
- 1 ppm/K = 10⁻⁶ K⁻¹ = 1 µm/(m·K) = 1 µm/(m·°C)
- 1 °F⁻¹ = 1.8 K⁻¹ ÷ 0.000001 K⁻¹ per ppm/K = 1800000 ppm/K
Both units are defined exactly, so the factor is exact. Per Degree Fahrenheit definition: per degree Fahrenheit; ppm/K definition: ppm per kelvin.
Worked examples
- A reading of 0.0000065 °F⁻¹ converts to 11.7 ppm/K.
0.0000065 °F⁻¹ × 1800000 = 11.7 ppm/K - A value of 0.00003 °F⁻¹ is 54 ppm/K.
0.00003 °F⁻¹ × 1800000 = 54 ppm/K
Per Degree Fahrenheit to ppm/K conversion table
| Per Degree Fahrenheit (°F⁻¹) | ppm/K |
|---|---|
| 0.0000003 °F⁻¹ | 0.54 ppm/K |
| 0.0000005 °F⁻¹ | 0.9 ppm/K |
| 0.000005 °F⁻¹ | 9 ppm/K |
| 0.0000065 °F⁻¹ | 11.7 ppm/K |
| 0.0000096 °F⁻¹ | 17.28 ppm/K |
| 0.0000128 °F⁻¹ | 23.04 ppm/K |
| 0.00003 °F⁻¹ | 54 ppm/K |
| 0.00005 °F⁻¹ | 90 ppm/K |
| 0.0001 °F⁻¹ | 180 ppm/K |
| 0.0005 °F⁻¹ | 900 ppm/K |
Where it's used
Per Degree Fahrenheit are used for US piping and structural codes (ASME B31, AISC), while ppm per kelvin appear in material datasheets for metals, ceramics and polymers. Both measure coefficient of thermal expansion (α, CTE), so the conversion is a fixed factor.
Per Degree Fahrenheit to other thermal expansion coefficient units
| Conversion | 1 °F⁻¹ equals |
|---|---|
| per degree Fahrenheit to ppm per kelvin | 1800000 ppm/K |
| per degree Fahrenheit to per kelvin | 1.8 K⁻¹ |
| per degree Fahrenheit to per degree Celsius | 1.8 °C⁻¹ |
| per degree Fahrenheit to ppm per degree Fahrenheit | 1000000 ppm/°F |
Frequently asked questions
How many ppm per kelvin are in 1 per degree Fahrenheit?
1 °F⁻¹ = 1800000 ppm/K.
How do I convert per degree Fahrenheit to ppm per kelvin?
Multiply the value in °F⁻¹ by 1800000. For example, 15 °F⁻¹ × 1800000 = 27000000 ppm/K.
Is the °F⁻¹ to ppm/K conversion exact?
Yes. Both units are defined exactly, and 1 °F⁻¹ is exactly 1800000 ppm/K.
Sources
- 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".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4, degree Celsius.
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 Degree Fahrenheit to ppm/K (°F⁻¹ to ppm/K). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/per-degree-fahrenheit-to-ppm-per-kelvin/
IEEE
Scientific Converters, "Convert Per Degree Fahrenheit to ppm/K (°F⁻¹ to ppm/K)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/per-degree-fahrenheit-to-ppm-per-kelvin/