Unit Converters
Temperature Converter
Convert a selected Celsius, Fahrenheit, or Kelvin input to Celsius, Fahrenheit, Kelvin, and Rankine. The four-thermometer visual aligns freezing, boiling, entered temperature, and absolute zero across all scales.
Celsius-
Fahrenheit-
Kelvin-
Rankine-
Decision view
Aligned thermodynamic temperature scales
Aligned thermodynamic temperature scalesCelsius, Fahrenheit, Kelvin, and Rankine share one physical reading while their zero points and step sizes remain explicit.
Exact scenario comparisonTemperature value changes while all other entered assumptions remain constant.
| Temperature value | Celsius | Fahrenheit | Kelvin | Rankine |
|---|
How to use Temperature Converter
- Select the unit attached to the source reading.
- Carry measurement uncertainty separately from the conversion formula.
- Check whether the physical context permits the resulting absolute temperature.
Calculator guide
Understanding Temperature Converter
Temperature scales are affine rather than simple unit multiples: Celsius and Fahrenheit have different zero points and step sizes, while Kelvin and Rankine begin at absolute zero.
Calculation method
How the calculation works
Convert an entered Celsius, Fahrenheit, or Kelvin value into all three scales plus Rankine using standard affine relationships. Normalize the selected input to Celsius, then apply Fahrenheit equals Celsius times 9/5 plus 32, Kelvin equals Celsius plus 273.15, and Rankine equals Kelvin times 9/5.
Scale landmarks
Use physical reference points to catch entry errors
Familiar landmarks make an incorrect unit selection obvious.
Worked situations
Practical examples
- 25 degrees Celsius equals 77 degrees Fahrenheit.
- The same temperature is 298.15 kelvin.
- It is also 536.67 degrees Rankine.
Better inputs
Useful tips
- Do not use temperature conversion factors for temperature differences without considering offset cancellation.
- Preserve source precision rather than adding unjustified decimals.
- Use kelvin without the degree symbol in scientific notation.
Before relying on the result
Limitations and common mistakes
- The calculator does not infer sensor calibration or uncertainty.
- Values below absolute zero can be produced arithmetically but are not physically meaningful in ordinary thermodynamics.
- Specialized historical scales and non-linear sensor conversions are excluded.
Reference
Key terms
- Affine scale
- Scale conversion requiring both multiplication and an offset.
- Absolute zero
- Zero kelvin, the lower reference of thermodynamic temperature.
- Kelvin
- SI thermodynamic temperature unit with Celsius-sized increments.
- Rankine
- Absolute scale using Fahrenheit-sized increments.
Important note
Calculated directly from the entered values using the displayed formula and rounding settings.
Frequently asked questions
Why can I not multiply Celsius by 1.8 alone?
Fahrenheit also requires the 32-degree offset.
Is 0 Celsius twice as warm as 0 Fahrenheit?
No. Ratio statements require an absolute thermodynamic scale.
Why is kelvin not written with a degree symbol?
The SI unit name and symbol are kelvin and K.
Can the converter handle temperature differences?
The displayed outputs are absolute readings; differences use scale factors without zero offsets.