Temperature Units and Conversions

Convert all Temperature units

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33.8 °F

1 °C = 33.8 °F

1 °C in every unit

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Popular conversions

5 pairs

Celsius ↔ Fahrenheit
°C ↔ °F
Celsius to Fahrenheit Fahrenheit to Celsius
Celsius ↔ Kelvin
°C ↔ K
Celsius to Kelvin Kelvin to Celsius
Celsius ↔ Rankine
°C ↔ °R
Celsius to Rankine Rankine to Celsius
Fahrenheit ↔ Rankine
°F ↔ °R
Fahrenheit to Rankine Rankine to Fahrenheit
Celsius ↔ Réaumur
°C ↔ °Ré
Celsius to Réaumur Réaumur to Celsius

Unit guides

5 units

Detailed guide to Temperature

Temperature indicates thermal state and is one of the most widely used measured quantities in engineering, science and everyday life.

Unlike purely proportional unit families, temperature conversions may include an offset as well as a scale factor.

Physical quantity: Temperature
SI base unit: Kelvin
Common engineering scale: Celsius
Typical offset example: 0 °C = 273.15 K
Typical use: Weather, process control and thermodynamics

Temperature scale context

Celsius is used for weather and everyday temperatures in most countries, while Fahrenheit is common in the United States. Kelvin is the absolute scale used in scientific work.

Temperature intervals are not converted with the same offset as absolute temperatures. Use a dedicated temperature converter rather than applying a simple ratio.

What is temperature?

Temperature represents the thermal condition of a body or environment.

It is used in weather data, materials, energy systems, fluid properties and laboratory work.

Celsius, Fahrenheit and Kelvin

Celsius is widely used in daily and engineering practice. Fahrenheit remains common in some countries, while Kelvin is the SI base unit used in science and thermodynamics.

Kelvin and Celsius share the same interval size, but Kelvin starts from absolute zero. A temperature of 0 °C is exactly 273.15 K, while water freezes at 32 °F on the Fahrenheit scale.

Temperature conversion formulas

To convert Celsius to Fahrenheit, multiply by 1.8 and add 32: °F = (°C × 1.8) + 32. To convert Fahrenheit to Celsius, subtract 32 and divide by 1.8: °C = (°F − 32) ÷ 1.8.

Kelvin uses an absolute zero point: K = °C + 273.15 and °C = K − 273.15. The converter applies these offsets automatically, so the result is not limited to simple multiplication.

Why are temperature conversions special?

Temperature scales do not always share the same zero point, so some conversions require both multiplication and addition or subtraction.

This is why Celsius-to-Fahrenheit and Celsius-to-Kelvin formulas differ from simple proportional conversions such as length or mass. For example, 20 °C is not twice as warm as 10 °C in an absolute physical sense because Celsius has an offset zero point.

Temperature values and temperature differences

A temperature value identifies a point on a scale, so the offset between Celsius, Fahrenheit and Kelvin matters. A temperature difference is an interval, such as a rise of 10 degrees during heating.

A difference of 1 °C has the same size as a difference of 1 K. A difference of 1 °F is smaller: it equals 5/9 of a Celsius or kelvin interval. This distinction matters in heat-transfer, material and engineering calculations.

Rankine and Réaumur

Rankine is an absolute temperature scale with degree steps the same size as Fahrenheit degrees. It is encountered in some US and imperial engineering contexts; 0 °R is absolute zero.

Réaumur is a historical scale that set water's freezing point to 0 °Ré and its boiling point to 80 °Ré. It is uncommon in modern work, but it can appear in older scientific, industrial and culinary sources.

Unit comparison table

Unit	Symbol	SI equivalent	System	Common use
Celsius	°C	0 °C = 273.15 K	Metric/international	Weather, cooking and engineering
Fahrenheit	°F	32 °F = 0 °C	US customary use	US weather, cooking and household settings
Kelvin	K	0 K = absolute zero	SI base unit	Science, thermodynamics and absolute temperature
Rankine	°R	0 °R = absolute zero	Fahrenheit-based absolute scale	US and imperial engineering references
Réaumur	°Ré	0 °Ré = 0 °C; 80 °Ré = 100 °C	Historical scale	Older scientific, industrial and culinary sources