Temperature Converter
Convert temperatures between Celsius, Fahrenheit and Kelvin using the exact offset formulas, with reference points.
20 °C in °F
68 °F
Converted temperature
Celsius
20 °C
Fahrenheit
68 °F
- Celsius
- 20 °C
- Fahrenheit
- 68 °F
- Kelvin
- 293.15 K
- Water freezes at
- 0 °C / 32 °F / 273.15 K
- Water boils at
- 100 °C / 212 °F / 373.15 K
- Human body
- 37 °C / 98.6 °F / 310.15 K
How this was calculated
- 1.Already in Celsius: 20 °C.
- 2.°F = 20 × 9/5 + 32 = 68.
Unlike length or mass, temperature scales have different zero points, so conversion needs an offset as well as a factor.
How the temperature calculation works
Celsius and Fahrenheit are offset scales: 0 °C is 32 °F, and the gap between freezing and boiling is 100 degrees Celsius but 180 degrees Fahrenheit. That is where the 9/5 factor comes from.
Kelvin starts at absolute zero, so it has no negative values. One kelvin is exactly the same size as one degree Celsius, which makes conversion a simple addition of 273.15.
−40 is the point where Celsius and Fahrenheit agree: −40 °C = −40 °F.
Worked example
Convert 20 °C to Fahrenheit.
- →20 × 9/5 = 36
- →36 + 32 = 68
Answer: 68 °F.
Temperature FAQs
What is the formula for Celsius to Fahrenheit?
Multiply by 9, divide by 5, then add 32. For 20 °C: 20 × 9 = 180, 180 ÷ 5 = 36, 36 + 32 = 68 °F.
Is 37 °C exactly body temperature?
It is the traditional average. Normal body temperature varies between about 36.1 and 37.2 °C, and 98.6 °F is the equivalent of 37 °C.
Can Kelvin be negative?
No. Absolute zero is 0 K, which is −273.15 °C. Nothing can be colder.
Temperature Converter is part of the conversion calculators collection on Calcora, alongside 7 other tools. Results are calculated in your browser and are for information only — see our disclaimer.
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