Quick reference table
Common thermal expansion conversions
| From | To |
|---|---|
| 1 ppm/K | 0.5555555556 ppm/°F |
| 1 ppm/°F | 1.8 ppm/K |
| 1 1/K | 1 ppm/K |
| 1 1/°F | 1.8 1/K |
How to convert thermal expansion
The coefficient of thermal expansion tells how much a material grows per degree of temperature rise. Steel is about 12 ppm/K and aluminum about 23 ppm/K.
Every thermal expansion unit is a fixed multiple of one base unit, the 1/K. To convert a value, multiply it by the size of the starting unit and divide by the size of the target unit. For example, to convert ppm/K to ppm/°F, multiply by 0.5555555556. To go the other way, divide by 0.5555555556.
The converter above does this for you and shows the exact formula under the result.
Worked examples
Parts per million per kelvin to Parts per million per degree Fahrenheit
| Parts per million per kelvin (ppm/K) | Parts per million per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 ppm/K | 0.5555555556 ppm/°F |
| 2 ppm/K | 1.111111111 ppm/°F |
| 5 ppm/K | 2.777777778 ppm/°F |
| 10 ppm/K | 5.555555556 ppm/°F |
| 25 ppm/K | 13.88888889 ppm/°F |
| 50 ppm/K | 27.77777778 ppm/°F |
| 100 ppm/K | 55.55555556 ppm/°F |
| 1,000 ppm/K | 555.5555556 ppm/°F |
Parts per million per degree Fahrenheit to Parts per million per kelvin
| Parts per million per degree Fahrenheit (ppm/°F) | Parts per million per kelvin (ppm/K) |
|---|---|
| 1 ppm/°F | 1.8 ppm/K |
| 2 ppm/°F | 3.6 ppm/K |
| 5 ppm/°F | 9.0 ppm/K |
| 10 ppm/°F | 18.0 ppm/K |
| 25 ppm/°F | 45.0 ppm/K |
| 50 ppm/°F | 90.0 ppm/K |
| 100 ppm/°F | 180.0 ppm/K |
| 1,000 ppm/°F | 1,800.0 ppm/K |
Thermal expansion units explained
| Unit | Symbol | Equals |
|---|---|---|
| Per kelvin | 1/K | 1 1/K = 1 1/K |
| Per degree Celsius | 1/°C | 1 1/°C = 1 1/K |
| Per degree Fahrenheit | 1/°F | 1 1/°F = 1.8 1/K |
| Parts per million per kelvin | ppm/K | 1 ppm/K = 0.000001 1/K |
| Parts per million per degree Celsius | ppm/°C | 1 ppm/°C = 0.000001 1/K |
| Parts per million per degree Fahrenheit | ppm/°F | 1 ppm/°F = 0.0000018 1/K |
| Percent per kelvin | %/K | 1 %/K = 0.01 1/K |
Popular conversions: ppm/c to ppm/f, thermal expansion coefficient.
Frequently asked questions
How is ppm/K the same as µm/(m·K)?
A growth of 1 µm per meter is 1 part per million, so 1 µm/(m·K) equals 1 ppm/K.
How do I convert ppm/K to ppm/°F?
Multiply the value in ppm/K by 0.5555555556 to get ppm/°F. For example, 10 ppm/K = 5.555555556 ppm/°F.
How many ppm/°F is 1 ppm/K?
1 ppm/K = 0.5555555556 ppm/°F, and 1 ppm/°F = 1.8 ppm/K.
Does this thermal expansion converter work offline?
Yes. After the page has loaded once, all calculations run in your browser, so it keeps working without an internet connection.