Convert room temperature
Scenario: A room is 72 degrees Fahrenheit and a Celsius value is needed.
Result: 72°F is approximately 22.22°C.
Subtract 32, then multiply by 5/9: (72 − 32) × 5/9 = 22.222….
🔄 Converters
Temperature Converter
Convert Celsius, Fahrenheit, and Kelvin temperatures instantly.
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How to use the Temperature Converter
Convert temperatures among Celsius, Fahrenheit, and Kelvin using the standard linear temperature formulas.
Convert temperature among Celsius, Fahrenheit, and kelvin with formulas that account for different zero points as well as scale sizes. Swap the direction instantly and choose the displayed decimal precision.
The conversion runs locally using the stated factors or formulas. Keep enough precision for the task and verify regulated or engineering work against its controlling standard.
- Enter a temperature value.
- Choose the scale the value currently uses.
- Choose the target scale and Fieldlet applies the appropriate formula.
Last reviewed for accuracy:
Worked examples
Convert freezing point to kelvin
Scenario: Pure water's commonly cited freezing point is 0°C under standard reference conditions.
Result: 0°C equals 273.15 K.
Kelvin is offset from Celsius by exactly 273.15 for this conversion.
How the result is produced
Celsius and Fahrenheit use different offsets and degree sizes. Kelvin uses the same interval size as Celsius but begins at absolute zero, so K = °C + 273.15.
- °C = (°F − 32) × 5/9
- °F = °C × 9/5 + 32
- K = °C + 273.15
Temperature values versus temperature differences
Offsets apply when converting an actual temperature reading. A change of one Celsius degree equals a change of one kelvin, while a one Celsius-degree change equals 1.8 Fahrenheit degrees.
- Convert readings with the full offset formula.
- Convert differences without adding the zero-point offset.
- Write kelvin without a degree symbol.
References
These primary references document standards or definitions used in the explanation above.
Limitations and common mistakes
- Kelvin values below zero are not physically meaningful on the thermodynamic scale.
- Instrument uncertainty and local conditions remain unchanged by converting the displayed unit.
Common questions
What is absolute zero in Celsius?
Absolute zero is −273.15 °C, which corresponds to 0 Kelvin.
When are Celsius and Fahrenheit equal?
They have the same numeric value at −40 degrees: −40°C equals −40°F.