Thermal Expansion Converter
Convert between 6 thermal expansion units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
12 ppm/K in all thermal expansion units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Part per million per kelvin | ppm/K | 12 |
| Part per million per °F | ppm/°F | 6.66667 |
| Per kelvin | 1/K | 0.000012 |
| Per degree Celsius | 1/°C | 0.000012 |
| Per degree Fahrenheit | 1/°F | 0.00000666667 |
| Per degree Rankine | 1/°R | 0.00000666667 |
How to Convert Thermal Expansion Units
The coefficient of thermal expansion gives the fractional change in size per degree of temperature change. The SI unit is per kelvin (1/K); material datasheets often quote it in ppm/K or per °F.
Every unit on this page is stored as a fixed factor relative to one reference unit, the per kelvin (1/K). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in 1/K.
- Divide that result by the factor of the target unit.
Part per million per kelvin to Part per million per °F conversion table
| Part per million per kelvin (ppm/K) | Part per million per °F (ppm/°F) |
|---|---|
| 1 ppm/K | 0.555556 ppm/°F |
| 2 ppm/K | 1.11111 ppm/°F |
| 3 ppm/K | 1.66667 ppm/°F |
| 4 ppm/K | 2.22222 ppm/°F |
| 5 ppm/K | 2.77778 ppm/°F |
| 6 ppm/K | 3.33333 ppm/°F |
| 7 ppm/K | 3.88889 ppm/°F |
| 8 ppm/K | 4.44444 ppm/°F |
| 9 ppm/K | 5 ppm/°F |
| 10 ppm/K | 5.55556 ppm/°F |
| 15 ppm/K | 8.33333 ppm/°F |
| 20 ppm/K | 11.1111 ppm/°F |
| 25 ppm/K | 13.8889 ppm/°F |
| 30 ppm/K | 16.6667 ppm/°F |
| 40 ppm/K | 22.2222 ppm/°F |
| 50 ppm/K | 27.7778 ppm/°F |
| 75 ppm/K | 41.6667 ppm/°F |
| 100 ppm/K | 55.5556 ppm/°F |
| 250 ppm/K | 138.889 ppm/°F |
| 500 ppm/K | 277.778 ppm/°F |
| 1,000 ppm/K | 555.556 ppm/°F |
Thermal Expansion Units and Conversion Factors
Value of one unit expressed in 1/K.
| Unit | Symbol | In 1/K |
|---|---|---|
| Part per million per kelvin | ppm/K | 0.000001 |
| Part per million per °F | ppm/°F | 0.0000018 |
| Per kelvin | 1/K | 1 |
| Per degree Celsius | 1/°C | 1 |
| Per degree Fahrenheit | 1/°F | 1.8 |
| Per degree Rankine | 1/°R | 1.8 |
Frequently Asked Questions
What is the SI unit of thermal expansion?
The SI unit of thermal expansion is the per kelvin (1/K). The coefficient of thermal expansion gives the fractional change in size per degree of temperature change.
How do I convert ppm/K to ppm/°F?
To convert part per million per kelvin (ppm/K) to part per million per °f (ppm/°F), multiply the value in ppm/K by 0.555556. For example, 1 ppm/K = 0.555556 ppm/°F.
How do I convert 1/°F to 1/K?
To convert per degree fahrenheit (1/°F) to per kelvin (1/K), multiply the value in 1/°F by 1.8. For example, 1 1/°F = 1.8 1/K.
How do I convert 1/K to ppm/K?
To convert per kelvin (1/K) to part per million per kelvin (ppm/K), multiply the value in 1/K by 1,000,000. For example, 1 1/K = 1,000,000 ppm/K.
Can I see a value in every thermal expansion unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 6 supported units. Click any row to make it the target unit.
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