Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly — with all results shown at once.

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Formula: BIPM / NISTLast verified July 2026

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Riferimento rapido — conversioni Celsius

°C	°F	K	°R
1	33.8	274.15	493.47
5	41	278.15	500.67
10	50	283.15	509.67
25	77	298.15	536.67
50	122	323.15	581.67
100	212	373.15	671.67

Esempi pratici

Body temperature: 37°C in Fahrenheit

Normal human body temperature is 37°C = 98.6°F. A fever is typically defined as above 38°C (100.4°F). Emergency departments in both systems use these benchmarks.

Oven temperature: 180°C for baking

180°C = 356°F. Most baking recipes in Fahrenheit round this to 350°F (177°C) — a very close approximation. At 400°F the actual temperature is 204°C, not 200°C.

Absolute zero: the coldest possible temperature

Absolute zero = 0 K = −273.15°C = −459.67°F. It is the theoretical point at which all molecular motion stops. It cannot be physically reached, only approached.

Domande frequenti

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What is the formula to convert Celsius to Fahrenheit?▾

°F = (°C × 9/5) + 32. For a quick mental estimate: double the Celsius value and add 30. This gives a rough answer within a few degrees (e.g., 20°C → 68°F exact; estimate → 70°F).

At what temperature are Celsius and Fahrenheit equal?▾

At −40°. Both scales intersect at exactly −40°C = −40°F. This is the only temperature where the two scales agree.

What is Kelvin and why is it used in science?▾

Kelvin is the SI base unit for temperature. It uses the same step size as Celsius but starts at absolute zero (0 K = −273.15°C). Scientists use Kelvin because thermodynamic equations require a scale that starts at true zero — negative Kelvin values would make many formulas undefined.

What is Rankine?▾

Rankine (°R) is the Fahrenheit equivalent of Kelvin — it starts at absolute zero but uses Fahrenheit-sized degrees. 0 K = 0 °R. Rankine is used in some US engineering contexts, particularly thermodynamic calculations in aerospace and heat transfer.

Is 30°C hot weather?▾

30°C = 86°F, which is considered warm to hot in most climates. The UAE and Gulf states regularly see summer temperatures above 40°C (104°F). The WHO defines extreme heat as temperatures above the 90th percentile for a region.

What is the difference between temperature and heat?▾

Temperature measures the average kinetic energy of particles in a substance. Heat is the transfer of energy from a hotter object to a cooler one. A large pot of water at 80°C contains more heat than a small spark at 3000°C — even though the spark has higher temperature.

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