Temperature Interval Converter
Convert temperature differences between kelvins, degrees Celsius, degrees Fahrenheit and degrees Rankine.
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Result
Temperature Interval units
Every unit below converts to every other one in the calculator. Values are relative to the base unit, the kelvin (difference) (ΔK).
| Unit | Symbol | System | Value |
|---|---|---|---|
| Kelvin (difference) | ΔK | SI | Base unit |
| Degree Celsius (difference) | Δ°C | SI | = 1 ΔK |
| Degree Fahrenheit (difference) | Δ°F | US customary | ≈ 0.5555555556 ΔK |
| Degree Rankine (difference) | Δ°R | US customary | ≈ 0.5555555556 ΔK |
Kelvin (difference) quick reference
| Kelvin (difference) | Degree Celsius (difference) | Degree Fahrenheit (difference) |
|---|---|---|
| 1 ΔK | = 1 Δ°C | = 1.8 Δ°F |
| 10 ΔK | = 10 Δ°C | = 18 Δ°F |
| 100 ΔK | = 100 Δ°C | = 180 Δ°F |
| 1000 ΔK | = 1000 Δ°C | = 1800 Δ°F |
Among the 4 temperature interval units on this page, the smallest is the degree fahrenheit (difference) (Δ°F) and the largest is the degree celsius (difference) (Δ°C).
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About temperature interval units
A temperature interval is the difference between two temperatures, such as a rise of 20 degrees or the gap between the inlet and outlet of a heat exchanger. Its SI unit is the kelvin. Only the size of the degree matters, so no offset is involved, unlike converting thermometer readings.
A change of 1 °C is exactly 1 K, and a change of 1 °F is exactly 1 °R, or 5/9 K. So a difference in °C is multiplied by 1.8 to get °F, without adding 32. Use this page for ranges, tolerances and temperature rises, and the temperature converter for readings.
Frequently asked questions
- Why is a change of 10 °C a change of 18 °F, not 50 °F?
- 50 °F is the reading that matches 10 °C. A change of 10 °C is a change of 10 × 1.8 = 18 °F, because the 32-degree offset cancels out when you subtract one temperature from another.
- Is a difference of 1 K the same as 1 °C?
- Yes. The kelvin and the degree Celsius are exactly the same size, so temperature differences have the same number in both units.
- How do I convert a temperature difference from °F to °C?
- Multiply by 5/9 (or divide by 1.8). A rise of 27 °F is a rise of exactly 15 °C.
- How many degrees Celsius (difference) are in one kelvin (difference)?
- One kelvin (difference) = 1 Δ°C (degrees Celsius (difference)).
- How many degrees Fahrenheit (difference) are in one kelvin (difference)?
- One kelvin (difference) = 1.8 Δ°F (degrees Fahrenheit (difference)).