Temperature Converter: Celsius, Fahrenheit, Kelvin
Convert temperatures between Celsius, Fahrenheit, and Kelvin instantly with formulas explained.
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Temperature Converter: Celsius, Fahrenheit, Kelvin Temperature is the one physical quantity where unit conversion requires addition and subtraction, not just multiplication. The scales were each defined historically with different reference points, which is why converting between them has a slightly different form than converting, say, metres to feet. --- The Three Main Temperature Scales Celsius (°C) Developed by Swedish astronomer Anders Celsius in 1742, the original Celsius scale set 0° at the boiling point of water and 100° at freezing — then inverted shortly after his death. The modern Celsius scale is defined by: 0°C: freezing point of water at 1 atm 100°C: boiling point of water at 1 atm Celsius is the standard scientific and everyday scale outside the United States. Fahrenheit…
Frequently Asked Questions
How do I convert Celsius to Fahrenheit?
Multiply Celsius by 9/5 (or 1.8), then add 32. Formula: F = (C × 9/5) + 32. For example, 100°C × 1.8 + 32 = 212°F. A quick mental check: 20°C ≈ 68°F, 37°C = 98.6°F (body temperature), 100°C = 212°F (boiling water at sea level).
What is the formula for Fahrenheit to Celsius?
Subtract 32, then multiply by 5/9. Formula: C = (F − 32) × 5/9. For example, 72°F: (72 − 32) × 5/9 = 40 × 0.5556 = 22.2°C. An easier mental check: subtract 30, divide by 2 gives a rough approximation.
What is absolute zero in Celsius?
Absolute zero is −273.15°C (or 0 K). This is the theoretical minimum temperature at which atomic motion essentially stops. It has never been achieved in practice, though scientists have cooled matter to within billionths of a degree above it.
Why does the US use Fahrenheit?
The Fahrenheit scale was introduced by German physicist Daniel Gabriel Fahrenheit in 1724 and adopted widely in the English-speaking world. When the rest of the world converted to Celsius (developed by Anders Celsius in 1742) during metric adoption in the 1800s–1900s, the US retained Fahrenheit. It is now used as the primary temperature scale only in the US, Belize, and the Cayman Islands.
What is the difference between Celsius and Kelvin?
The Kelvin and Celsius scales use the same degree size — a difference of 1°C equals a difference of 1 K. They differ only in their zero points. Kelvin starts at absolute zero (−273.15°C), while Celsius sets zero at the freezing point of water. So K = C + 273.15.
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