Convert ppm/°F to Per Degree Fahrenheit (ppm/°F to °F⁻¹)
1 ppm per degree Fahrenheit (ppm/°F) = 0.000001 per degree Fahrenheit (°F⁻¹). 1 °F⁻¹ = 1000000 ppm/°F. Example: 15 ppm/°F = 15 × 0.000001 = 0.000015 °F⁻¹.
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1 ppm/°F = 0.000001 °F⁻¹
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk ppm per degree Fahrenheit to per degree Fahrenheit converter to paste a column from Excel.
How to Convert ppm/°F to Per Degree Fahrenheit
- 1 ppm/°F = 0.000001 °F⁻¹
- 1 °F⁻¹ = 1000000 ppm/°F
- Example: convert 15 ppm/°F to °F⁻¹: 15 ppm/°F = 15 × 0.000001 °F⁻¹ = 0.000015 °F⁻¹
Formula
°F⁻¹ = ppm/°F ÷ 1000000
Derivation from SI units:
- 1 ppm/°F = 10⁻⁶ /°F = 1.8 × 10⁻⁶ K⁻¹ = 1 µin/(in·°F)
- A Fahrenheit degree is 5/9 of a kelvin, so 1/°F = 1.8/K (exact)
- 1 ppm/°F = 0.0000018 K⁻¹ ÷ 1.8 K⁻¹ per °F⁻¹ = 0.000001 °F⁻¹
Both units are defined exactly, so the factor is exact. ppm/°F definition: ppm per degree Fahrenheit; Per Degree Fahrenheit definition: per degree Fahrenheit.
Worked examples
- A reading of 5 ppm/°F converts to 0.000005 °F⁻¹.
5 ppm/°F × 0.000001 = 0.000005 °F⁻¹ - A value of 9.6 ppm/°F is 0.0000096 °F⁻¹.
9.6 ppm/°F × 0.000001 = 0.0000096 °F⁻¹
ppm/°F to Per Degree Fahrenheit conversion table
| ppm/°F | Per Degree Fahrenheit (°F⁻¹) |
|---|---|
| 0.3 ppm/°F | 3 × 10⁻⁷ °F⁻¹ |
| 1 ppm/°F | 0.000001 °F⁻¹ |
| 3 ppm/°F | 0.000003 °F⁻¹ |
| 5 ppm/°F | 0.000005 °F⁻¹ |
| 6.5 ppm/°F | 0.0000065 °F⁻¹ |
| 7 ppm/°F | 0.000007 °F⁻¹ |
| 9.6 ppm/°F | 0.0000096 °F⁻¹ |
| 12.8 ppm/°F | 0.0000128 °F⁻¹ |
| 20 ppm/°F | 0.00002 °F⁻¹ |
| 50 ppm/°F | 0.00005 °F⁻¹ |
Where it's used
ppm/°F are used for US material and alloy datasheets, 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/°F to other thermal expansion coefficient units
| Conversion | 1 ppm/°F equals |
|---|---|
| ppm per degree Fahrenheit to per degree Fahrenheit | 0.000001 °F⁻¹ |
| ppm per degree Fahrenheit to per kelvin | 0.0000018 K⁻¹ |
| ppm per degree Fahrenheit to ppm per kelvin | 1.8 ppm/K |
| ppm per degree Fahrenheit to per degree Celsius | 0.0000018 °C⁻¹ |
Frequently asked questions
How many per degree Fahrenheit are in 1 ppm per degree Fahrenheit?
1 ppm/°F = 0.000001 °F⁻¹.
How do I convert ppm per degree Fahrenheit to per degree Fahrenheit?
Multiply the value in ppm/°F by 0.000001, or divide it by 1000000. For example, 15 ppm/°F × 0.000001 = 0.000015 °F⁻¹.
Is the ppm/°F to °F⁻¹ conversion exact?
Yes. Both units are defined exactly, and 1 ppm/°F is exactly 0.000001 °F⁻¹.
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".
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/°F to Per Degree Fahrenheit (ppm/°F to °F⁻¹). Retrieved October 25, 2026, from https://scientificconverters.com/thermal-expansion/ppm-per-degree-fahrenheit-to-per-degree-fahrenheit/
IEEE
Scientific Converters, "Convert ppm/°F to Per Degree Fahrenheit (ppm/°F to °F⁻¹)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/thermal-expansion/ppm-per-degree-fahrenheit-to-per-degree-fahrenheit/