Tool guide
How to use the Temperature Converter
Temperature scales do not all begin at the same zero or use the same interval size. This converter handles Celsius, Fahrenheit, kelvin, and Rankine by converting the entered value through absolute temperature, which keeps every supported direction consistent. Celsius and kelvin use equal-sized intervals but different zero points, while Fahrenheit and Rankine use equal-sized intervals with different zero points. Kelvin is written K without a degree symbol; Rankine is commonly written °R.
People also use this tool for
People also use this temperature converter to change Celsius, Fahrenheit, Kelvin, and Rankine for weather, cooking, science homework, travel planning, laboratory notes, heating settings, international measurements, and exact absolute-temperature comparisons.
What this tool is useful for
- Convert weather forecasts, thermostat settings, oven temperatures, laboratory notes, and international measurements among four temperature scales.
- See Celsius, Fahrenheit, kelvin, and Rankine together instead of calculating each conversion separately.
- Check absolute zero and familiar water or room-temperature reference points while reviewing the formula used.
Practical example
To convert 25°C to Fahrenheit, multiply 25 by 9/5 and add 32, giving 77°F. The same temperature is 298.15 K because 273.15 is added to the Celsius value, and 536.67°R because kelvin is multiplied by 9/5. Changing the decimal setting affects only the displayed rounding, not the underlying conversion.
Helpful tips
- Kelvin is an absolute scale and its unit symbol is K, not °K.
- A temperature interval of 1 K equals an interval of 1°C, but an absolute reading of 1 K does not equal 1°C.
- Water boils at 100°C or 212°F only at standard atmospheric pressure; altitude, pressure, dissolved material, and measurement conditions can change the real boiling point.
- Use more decimal places when carrying a converted value into another calculation, then round only the final result to the precision the task requires.
Related tools and next steps
Cooking Measurement Converter, Length Converter, Weight Converter, Time Converter, Converters
Common questions this tool can help answer
Common temperature questions this converter can help answer
- What is Celsius in Fahrenheit?
- What is Fahrenheit in Celsius?
- How do I convert Kelvin or Rankine?
- What is absolute zero on every scale?
- What is the freezing or boiling point of water?
- How do I convert temperatures for cooking, weather, science, or travel?
Sources and methodology
The formulas, standards, and reference information on this page are checked against the authoritative sources below. External references open the original source.
- NIST: Exact temperature conversions
- NIST Guide to the SI: Temperature conversion factors
- NIST: Kelvin and absolute zero
- USGS: Pressure, altitude and the boiling point of water
Frequently asked questions
Which temperature scales does this converter support?
It converts Celsius (°C), Fahrenheit (°F), kelvin (K), and Rankine (°R) in every direction and displays the equivalent value on all four scales.
What formulas convert Celsius and Fahrenheit?
Celsius to Fahrenheit uses °F = (°C × 9/5) + 32. Fahrenheit to Celsius uses °C = (°F − 32) × 5/9.
How do I convert Celsius to kelvin?
Add exactly 273.15: K = °C + 273.15. A change of one kelvin has the same magnitude as a change of one degree Celsius, but their zero points differ.
How do I convert Fahrenheit to Rankine?
Add exactly 459.67: °R = °F + 459.67. Rankine uses Fahrenheit-sized intervals but starts at absolute zero.
What is absolute zero in Celsius and Fahrenheit?
Absolute zero is 0 K, −273.15°C, −459.67°F, and 0°R. The converter rejects an entered value below that limit for ordinary thermodynamic conversions.
Why is kelvin written without a degree symbol?
The SI unit name is kelvin and its symbol is K. Temperatures are written, for example, as 300 K rather than 300°K.
Is 100°C always the boiling point of water?
No. Pure water boils at 100°C or 212°F at standard atmospheric pressure, but boiling temperature changes with pressure and therefore with altitude. Dissolved substances can also affect it.
Are displayed decimal values exact?
The scale relationships and offsets used here are exact. The displayed value may be rounded to the decimal-place setting you choose, so retain additional digits when the result will be used in another calculation.
Can this tool calculate heat index or wind chill?
No. It converts measured temperatures only. Heat index requires humidity, while wind chill requires wind speed and uses separate models with defined limits.
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