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Temperature Unit Converter (Celsius, Fahrenheit, Kelvin)
Convert a temperature among Celsius, Fahrenheit, and Kelvin.
Page updated 2026-09-04.
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Celsius
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72°F, converted to its Celsius equivalent
72°F converts to 22.22°C -- a comfortable room-temperature value in both scales, which is part of why 72°F/22°C is such a commonly cited 'typical room temperature' reference point.
The Fahrenheit-to-Celsius formula is C = (F - 32) x 5/9 = (72 - 32) x 5/9 = 40 x 5/9 = 22.22 -- the subtraction of 32 first accounts for the different zero points of the two scales (0°C is 32°F, not 0°F), and the 5/9 factor accounts for their different degree sizes.
Fahrenheit and Celsius only intersect at one single temperature: -40 degrees, where both scales read the identical number -- a well-known quirk that falls directly out of solving the conversion formula for the point where F = C.
Why absolute zero is the same physical point in every scale
K = C + 273.15. F = C x 9/5 + 32. Absolute zero is -273.15 C. Kelvin, unlike Celsius and Fahrenheit, is an absolute temperature scale with its zero point set at absolute zero -- the theoretical point where all thermal molecular motion stops, at exactly -273.15°C. This is why Kelvin is the standard unit in most scientific contexts: it has no negative values for any physically real temperature.
Converting from Celsius to Kelvin is simply addition (K = C + 273.15), with no multiplication factor needed, since both scales use the same size 'degree' (a change of 1°C equals a change of 1 K) -- they only differ in where zero is set, unlike the Celsius-to-Fahrenheit conversion, which needs both an offset and a scaling factor.
The Fahrenheit-to-Celsius and Celsius-to-Fahrenheit conversions are inverse operations of each other -- running 22.22°C back through F = C x 9/5 + 32 gives 22.22 x 1.8 + 32 = 40 + 32 = 72°F, confirming the round-trip conversion returns the original value.
Related physical unit conversion tools
For a similarly structured conversion between pressure units (psi, bar, pascals), the Pressure Unit Converter covers that related physical measurement.
For energy unit conversions across joules, calories, kWh, and BTU, the Energy Unit Converter is a related conversion tool.
Frequently Asked Questions (FAQ)
How is 72°F converted to 22.22°C?
C = (F - 32) x 5/9 = (72 - 32) x 5/9 = 40 x 5/9 = 22.22°C. The subtraction of 32 adjusts for the different zero points, and the 5/9 factor adjusts for the different degree sizes between the two scales.
Is there a temperature where Fahrenheit and Celsius show the same number?
K = C + 273.15. F = C x 9/5 + 32. Absolute zero is -273.15 C. Yes -- at exactly -40 degrees, both scales read the identical value (-40°F = -40°C), a well-known quirk that falls directly out of solving the conversion formula for the point where F equals C.
Why does converting Celsius to Kelvin only require addition, not multiplication?
K = C + 273.15. F = C x 9/5 + 32. Absolute zero is -273.15 C. Because Celsius and Kelvin use the same size degree (a 1-degree change is identical in both scales) -- they only differ in where zero is set. Fahrenheit uses both a different zero point and a different-sized degree, which is why its conversion needs both an offset and a scaling factor.
Why is Kelvin the preferred scale in scientific work?
K = C + 273.15. F = C x 9/5 + 32. Absolute zero is -273.15 C. Because Kelvin's zero point is set at absolute zero, the theoretical limit where thermal molecular motion stops -- this means Kelvin has no negative values for any physically real temperature, which simplifies many scientific formulas and comparisons.
If I convert 22.22°C back to Fahrenheit, do I get exactly 72 again?
Yes -- F = C x 9/5 + 32 = 22.22 x 1.8 + 32 = 40 + 32 = 72°F, confirming the Celsius-to-Fahrenheit and Fahrenheit-to-Celsius conversions are exact inverse operations of each other.
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