Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine, with the formula and common temperatures.

Value

From

100 °C =

212 °F

Formula: °F = °C × 9/5 + 32

In every unit of temperature

Precision

Decimal places

Group digits

Unit	Value	Copy
Celsius	100 °C
Fahrenheit	212 °F
Kelvin	373.15 K
Rankine	671.67 °R

Converts temperatures between Celsius, Fahrenheit, Kelvin and Rankine, with the formula for the pair and the value on all four scales at once.

How to use it

Type a value and choose the scales to convert from and to; C, F and celsius all work in the pickers. Negative temperatures are fine, down to absolute zero: anything colder is rejected. Precision is Auto (up to 10 significant figures, and every whole-number digit) or Fixed (0 to 10 decimal places).

Why temperature needs an offset

Celsius and Fahrenheit put their zero in different places, so converting takes an offset as well as a factor. That is also why doubling a temperature means nothing: 20 °C is not twice as warm as 10 °C, and the same two temperatures are 68 °F and 50 °F.

Kelvin and Rankine start at absolute zero, the coldest possible temperature. Kelvin uses the Celsius degree and Rankine the Fahrenheit degree, so K = °C + 273.15 and °R = °F + 459.67. The two everyday scales meet at −40, where -40 °C is -40 °F.

°F = °C × 9/5 + 32

°C = (°F − 32) × 5/9

K = °C + 273.15

°R = °F + 459.67

Examples

A fever reading

101.3 °F is 38.5 °C. Formula: °C = (°F − 32) × 5/9.

An oven setting

200 °C is 392 °F. Formula: °F = °C × 9/5 + 32.

Common temperatures

Everyday temperatures on each scale

Temperature	°C	°F	K
Absolute zero	-273.15	-459.67	0
Where Celsius and Fahrenheit meet	-40	-40	233.15
Home freezer	-18	-0.4	255.15
Water freezes	0	32	273.15
Fridge	4	39.2	277.15
Room temperature	20	68	293.15
Hot summer day	30	86	303.15
Normal body temperature	37	98.6	310.15
Fever	38	100.4	311.15
Water boils at sea level	100	212	373.15
Moderate oven	180	356	453.15
Hot oven	220	428	493.15