Temperature conversion hub
Temperature Converter
Convert Celsius, Fahrenheit, Kelvin, Rankine, and Reaumur in one place. The converter shows the main result first, compares the same reading across other scales, and includes the water triple-point reference for specialist work.
From
Enter the temperature and choose a source scale
To
Result updates automatically
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Common starting points
Temperature at a glance
Compare everyday, scientific, thermodynamic, historical, and reference-point scales without leaving the page.
77
Fahrenheit (degF)
Source
Celsius (degC)
Direction
Live conversion
Target
Fahrenheit (degF)
Equivalent values across scales and reference
Useful when a weather value, lab reading, or engineering note needs more than one scale.
degC
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Celsius
degF
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Fahrenheit
K
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Kelvin
degR
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Rankine
degRe
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Reaumur
x TPW
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Water triple-point multiples
The x TPW value is a multiple of the water triple-point reference, with 1 x TPW treated as 273.16 K in this converter. It is not a conventional temperature scale.
Scale and reference shortcuts
tap any option
Interpreting temperature results
Four Details That Can Change What a Temperature Means
A converted temperature is only useful when its original meaning stays intact. Before using the result, check whether the source describes an actual temperature reading or a temperature change, how precise the measurement is, and whether pressure, material behavior, or physical limits affect the value.
Reading or Interval?
A temperature reading and a temperature change are not converted in the same way. For example, a reading of 10°C converts differently from an increase of 10°C. Scale offsets apply to actual readings, not to the size of a temperature change.
Converted Digits Are Not New Accuracy
A converted result may show several decimal places, but that does not make the original measurement more precise. If a sensor was rounded to the nearest degree, the converted value should be treated with the same level of accuracy.
Boiling Point Depends on Pressure
Water boils at 100°C only near standard atmospheric pressure. At higher elevations, where air pressure is lower, water boils at a lower temperature.
Air and Surface Readings Can Differ
A wall, pan, pipe, roof, or road surface may be much hotter or colder than the surrounding air. Always record what the sensor actually measured so the converted temperature keeps the right context.
Popular Temperature Converters
Start with these common temperature conversions for weather, cooking, lab values, dashboards, HVAC notes, and thermodynamics.
Celsius to Fahrenheit
Convert weather, cooking, and room temperatures from degC into degF.
Fahrenheit to Celsius
Turn US temperature readings into Celsius for travel, weather, recipes, and reports.
Celsius to Kelvin
Move from everyday Celsius readings into the absolute scale used in science.
Kelvin to Celsius
Translate lab, physics, and sensor values into a Celsius temperature people can read quickly.
Fahrenheit to Kelvin
Convert Fahrenheit readings into Kelvin for engineering notes and scientific calculations.
Kelvin to Fahrenheit
Convert absolute temperature values into Fahrenheit for US-facing dashboards and labels.
Celsius to Rankine
Use when a Celsius value needs to be written on an absolute Fahrenheit-sized scale.
Rankine to Celsius
Convert Rankine values back into Celsius for easier reading and reporting.
Fahrenheit to Rankine
Shift Fahrenheit readings into Rankine for thermodynamics and engineering references.
Rankine to Fahrenheit
Bring Rankine values back to Fahrenheit for US customary temperature context.
Kelvin to Rankine
Convert between the two absolute temperature scales used in science and engineering.
Rankine to Kelvin
Bring Rankine temperatures into Kelvin for equations, lab notes, and SI-based reporting.
Celsius to Reaumur
Convert Celsius into the Reaumur scale when working with older references or archival material.
Reaumur to Kelvin
Convert the historical Reaumur scale into Kelvin for archival or technical comparisons.
Triple Point of Water to Kelvin
Convert water triple-point multiples into Kelvin using 273.16 K as the reference value.
Which Temperature Scale Fits Best?
A useful temperature conversion should do more than return the correct number. It should also make sense in the situation where the value will be used. For example, a weather app, recipe, classroom exercise, lab report, and turbine calculation may all involve temperature, but each one may need a different scale to make the result clear, practical, and easy to interpret.
| Task | Best scale | Why it works | Helpful converter |
|---|---|---|---|
| Weather and travel | degC or degF | These are the scales most people expect in forecasts and thermostats. | Celsius to Fahrenheit |
| Cooking and ovens | degF or degC | Recipes and appliance manuals often use different regional scales. | Fahrenheit to Celsius |
| Science and labs | Kelvin | Kelvin is appropriate for equations that require absolute temperature. | Celsius to Kelvin |
| US engineering notes | Rankine | Rankine uses Fahrenheit-sized degrees on an absolute scale. | Fahrenheit to Rankine |
| Historical references | Reaumur | Reaumur appears in older scientific and food-processing material. | Reaumur to Kelvin |
Helpful Temperature Reference
Temperature conversions are easier to understand when you know a few key reference points.
Celsius and Kelvin use the same size degree steps, but they begin from different zero points. Fahrenheit differs in both ways: it uses a different degree size and a different starting point.
Because of these differences, temperature conversion is not always a simple multiplication. In many cases, the formula also needs an added or subtracted offset to produce the correct result.
| Reference point | Celsius | Fahrenheit | Kelvin | Rankine |
|---|---|---|---|---|
| Absolute zero | -273.15 degC | -459.67 degF | 0 K | 0 degR |
| Water freezes near standard pressure | 0 degC | 32 degF | 273.15 K | 491.67 degR |
| Example room temperature | 20 degC | 68 degF | 293.15 K | 527.67 degR |
| Water boils at standard atmospheric pressure | 100 degC | 212 degF | 373.15 K | 671.67 degR |
Rounding Temperature Values the Right Way
Round temperature values according to how the result will be used. For a weather card, whole degrees are usually clear enough. For cooking, use the oven temperature setting shown on the appliance. For a lab report, match the precision of the measuring instrument. When calculating average temperatures, keep the full values during the calculation and round only the final result before displaying it.
Temperature Sources and Scope
These tools are designed for temperature scale conversions, not heat energy, heat transfer, or weather index values such as heat index or wind chill. If you need to convert distance, use the length converters. If you need liquid capacity or volume, use the volume converters. For measurement reference, the SI Brochure maintained by BIPM defines the kelvin as an SI base unit, while NIST provides guidance on SI usage and US measurement practices.
Questions About Unusual Temperature Results
Can a temperature go below 0 Kelvin?
No. 0 Kelvin is absolute zero, the lowest point on the Kelvin scale. If a conversion shows a negative Kelvin value, the input is outside the normal physical temperature range and should be checked.
Why are Celsius and Fahrenheit equal at -40?
Celsius and Fahrenheit use different zero points and different degree sizes, but their conversion lines meet at -40. That is why -40°C and -40°F describe the same temperature.
What does TPW mean in this converter?
TPW means the triple point of water. In this converter, 1 TPW is treated as 273.16 K, and 2 TPW is treated as 546.32 K. This option compares multiples of that reference value. It is useful as a scientific reference, but it should not be treated as a conventional everyday temperature scale.