Temperature Converter
Free online temperature converter
Popular temperature conversions
About temperature scales
Temperature scales mix ratios and offsets. Kelvin (K) is absolute; Celsius (°C) and Fahrenheit (°F) are offset scales.
- °C → °F: (°C × 9/5) + 32
- °F → °C: (°F − 32) × 5/9
Units in Temperature Converter
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Celsius (°C)
(celsius)
Celsius (°C) is an offset scale where 0 °C marks water’s freezing point and 100 °C its boiling point at 1 atm. Widely used worldwide.
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Fahrenheit (°F)
(fahrenheit)
Fahrenheit (°F) is an offset scale with 32 °F as freezing point and 212 °F as boiling point. Still used in the US and some Caribbean nations.
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Kelvin (K)
(kelvin)
Kelvin (K) is the SI base unit of temperature, measuring absolute thermodynamic temperature starting from absolute zero.
-
Rankine (°R)
(rankine)
Temperature unit used in specific engineering or scientific contexts (e.g. Rankine).
Formulas and notes
Offsets matter: °F = (°C × 9/5) + 32, K = °C + 273.15.
Temperature conversions are affine (ratio + offset), not pure ratios.
Quick examples
FAQ
Is temperature conversion exact?
Temperature conversions use exact affine formulas (ratio + offset).
Can I share a specific result?
Yes. Every converter has a clean, shareable URL like
/convert/meter-to-foot/2.5.