How do I convert Celsius to Fahrenheit?

Multiply °C by 9/5 and add 32. Formula: °F = (°C × 1.8) + 32. Example: 100°C = 212°F. A useful shortcut for travel: double the Celsius temperature and add 30 (gives an approximate answer).

What is absolute zero in Celsius and Fahrenheit?

Absolute zero is 0 Kelvin, which equals −273.15 °C or −459.67 °F. It is the lowest theoretically possible temperature, where all molecular motion stops.

Temperature Conversions

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Popular Comparisons

	°C	°F	K	°R
Absolute zero	-273.15	-459.67	0	0
Water freezes	0	32	273.15	491.67
Room temperature	20	68	293.15	527.67
Body temperature	37	98.6	310.15	558.27
Water boils	100	212	373.15	671.67

Temperature

Temperature is a physical quantity that expresses the degree of hotness or coldness of a system, and is fundamentally related to the average kinetic energy of the particles within it. The three scales used in science and daily life — Celsius, Fahrenheit, and Kelvin — share the same physics but differ in their reference points and the size of their degrees.

The Celsius scale (°C), proposed by Anders Celsius in 1742, sets 0° at the freezing point of water and 100° at its boiling point at standard atmospheric pressure. The Fahrenheit scale (°F), developed by Daniel Gabriel Fahrenheit in 1724, places these points at 32° and 212° respectively, resulting in 180 degrees between them compared to 100 in Celsius. The Kelvin scale (K), introduced by Lord Kelvin in 1848, is the SI unit of thermodynamic temperature and begins at absolute zero (−273.15 °C) — the point at which all classical thermal motion ceases.

In scientific work, Kelvin is preferred because it avoids negative values and is directly proportional to thermal energy, making it essential in thermodynamics, astrophysics, and chemistry. The conversion formulas — °F = (°C × 9/5) + 32 and K = °C + 273.15 — are among the most commonly tested in physics and chemistry curricula worldwide.