Temperature Converter: Celsius to Fahrenheit & Kelvin

Convert °C to °F, °F to °C and Kelvin instantly, with the formula and a handy chart for weather, cooking and body temperature.

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All conversions

Quick answer: To convert Celsius to Fahrenheit, multiply by 9/5 (1.8) and add 32: °F = °C × 1.8 + 32. To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9: °C = (°F − 32) ÷ 1.8. For example, 30 °C = 86 °F.

Celsius to Fahrenheit chart

°C	°F	What it means
−40	−40	The point where both scales are equal
0	32	Water freezes
20	68	Comfortable room temperature
25	77	Typical air-conditioner setting
30	86	Hot day
37	98.6	Normal body temperature
40	104	Very hot day / high fever
45	113	Gulf summer afternoon
50	122	Extreme desert heat
100	212	Water boils at sea level
180	356	Moderate oven (baking)

Quick mental trick

For a fast estimate of °C to °F, double the Celsius and add 30: 25 °C → 50 + 30 = 80 °F (exact: 77 °F). For the reverse, subtract 30 and halve: 90 °F → 60 ÷ 2 = 30 °C (exact: 32.2 °C). Use the converter above when you need the exact value, for example for medicine, cooking or science homework.

What is Kelvin?

Kelvin is the scientific temperature scale that starts at absolute zero, the coldest possible temperature. One kelvin step is the same size as one degree Celsius, so K = °C + 273.15. Kelvin is written without the degree sign: 300 K, not 300 °K.

Frequently asked questions

What is the formula to convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 1.8 and add 32. For example, 20 C x 1.8 + 32 = 68 F.

What is 37 degrees Celsius in Fahrenheit?

37 C is 98.6 F, the traditional normal human body temperature.

What is 100 F in Celsius?

100 F is 37.8 C.

At what temperature are Celsius and Fahrenheit the same?

At minus 40 degrees: -40 C equals -40 F.

How do I convert Celsius to Kelvin?

Add 273.15 to the Celsius value. 25 C is 298.15 K.

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