Celsius to Fahrenheit - Fahrenheit to Celsius Converter

Convert Fahrenheit to Centigrade (f to c) or Centigrade to Fahrenheit (c to f), Celsius to Kelvin, Kelvin to Celsius, Fahrenheit to Rankine, Rankine to Fahrenheit

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Celsius - Fahrenheit Converter

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Enter either Fahrenheit or Celsius or Kelvin or Rankine and calculate the equivalent

Formula of Fahrenheit to Celsius and Celsius to Fahrenheit

Convert Degrees Centigrade to Fahrenheit (degrees celsius to f, c to f)

° F = ° C x 9 / 5 + 32

eg. C= 30 , F = 30 x 9/5 + 32 = 86

Convert Degrees Fahrenheit to Centigrade (degrees fahrenheit to c, f to c)

° C = ( ° F - 32 ) x 5 / 9

eg. F= 40 , C = ( 40 - 32 ) x 5 / 9 = 4.44

From / To Conversion Formula Example
Celsius to Kelvin (C to K) °C + 273.15 = K C= 30 , K = 30 + 273.15 = 303.1
Celsius to Rankine (C to R) °R = (° C + 273.15) x 1.8 C= 30 , R = ( 30 + 273.15 ) x 1.8 = 545.6
Fahrenheit to Kelvin (F to K) (°F − 32) × 5/9 + 273.15 F= 40 , K = (40 − 32) × 5/9 + 273.15 =277.5
Fahrenheit to Rankine (F to R) °R = °F + 459.67 F= 40 , R = 40 + 459.67 = 499.6
Kelvin to Celsius (K to C) K − 273.15 = °C K= 50 , C = 50− 273.15 = -223.15
Kelvin to Fahrenheit (K to F) (K − 273.15) × 9/5 + 32 = °F K= 50 , F = (50 − 273.15) × 9/5 + 32 = -369.67
Kelvin to Rankine (K to R) °R = K x 1.8 K= 50 , R = 50 x 1.8 = 90
Rankine to Celsius (R to C) °C = °R - 491.67) / 1.8 R = 60 , C = 60 - 491.67) / 1.8 = -239.8
Rankine to Fahrenheit (R to F) °F = °R - 459.67 R = 60 , F = 60 - 459.67 = -399.67
Rankine to Kelvin (R to K) °K = °R / 1.8 R = 60 , K = °R / 1.8 = 33.33

• Celsius or centigrade scale is a temperature scale that is based on the freezing point of water at 0°C and the boiling point of water at 100°C.

• Fahrenheit scale is a temperature scale that is based on the freezing point of water at 32°F and the boiling point of water at 212°F.

• Multiply celsius value with x 9 / 5 + 32 to convert celcius to fahrenheit and subtract fahrenheit value with 32 and multiplies by 5 / 9 to convert fahrenheit to celcius

Celsius, Kelvin, Fahrenheit and Rankine Temperature Scales

• Celsius, Fahrenheit, Rankine and Kelvin are all temperature scales

• Celsius (°C) is the most common temperature scale in the world, and it is used in most scientific applications. Kelvin (K) is the SI base unit of temperature

, and it is used in thermodynamics and other scientific fields.
• Rankine (°R) is a temperature scale that is used in the United States in engineering and other technical applications. Fahrenheit (°F) is a temperature scale that is commonly used in the United States in everyday life.

• Celsius: The Celsius scale was originally called the centigrade scale, meaning "one hundred degrees."
• The scale was originally defined with 0 °C as the freezing point of water and 100 °C as the boiling point of water.
• However, in 1948, the International System of Units (SI) redefined the Celsius scale with 0 °C as the triple point of water (the temperature at which water can exist as a solid, liquid, and gas at the same time).
• Fahrenheit: The Fahrenheit scale was invented by German physicist Daniel Gabriel Fahrenheit in 1724.
• Fahrenheit originally defined his scale with 0 °F as the temperature of a mixture of ice, water, and ammonium chloride, and 100 °F as the temperature of the human body.
• However, in 1742, Fahrenheit redefined his scale with 0 °F as the freezing point of water and 96 °F as the boiling point of water.
• Kelvin: The Kelvin scale is an absolute temperature scale, meaning that it has a true zero point.
• The Kelvin scale is defined with 0 K as the temperature at which all molecular motion ceases.
• The Kelvin scale is named after William Thomson, 1st Baron Kelvin, who proposed the scale in 1848.
• Rankine: The Rankine scale is also an absolute temperature scale.
• The Rankine scale is defined with 0 °R as the temperature at which all molecular motion ceases.
• The Rankine scale is named after William John Macquorn Rankine, who proposed the scale in 1859.
• The Rankine scale is related to the Fahrenheit scale by the equation °R = °F + 459.67

. This is because the Rankine scale has the same size unit of temperature as the Fahrenheit scale.
• The Kelvin scale is related to the Celsius scale by the equation K = °C + 273.15

. This is because the Kelvin scale has the same zero point as the Celsius scale.
Here is a table comparing the four temperature scales:
Temperature scaleZero pointFreezing point of waterBoiling point of water
Celsius0 °C0 °C100 °C
Fahrenheit32 °F32 °F212 °F
Rankine0 °R491.67 °R671.67 °R
Kelvin0 K273.15 K373.15 K

Celsius to Fahrenheit (c to f, centigrades to f) and conversion with Rankine and Kelvin scale

-273.15 C -459.67 F0 K0 R
-272.15 C -457.87 F1 K1.8 R
-268.15 C -450.67 F5 K9 R
-263.15 C -441.67 F10 K18 R
-258.15 C -432.67 F15 K27 R
-253.15 C -423.67 F20 K36 R
-248.15 C -414.67 F25 K45 R
-243.15 C -405.67 F30 K54 R
-238.15 C -396.67 F35 K63 R
-233.15 C -387.67 F40 K72 R
-228.15 C -378.67 F45 K81 R
-223.15 C -369.67 F50 K90 R
-173.15 C -279.67 F100 K180 R
226.85 C 440.33 F500 K900 R
726.85 C 1340.33 F1000 K1800 R
-273.15 C -459.67 F0 K0 R
-272.594 C -458.67 F0.556 K1 R
-270.372 C -454.67 F2.77778 K5 R
-267.594 C -449.67 F5.55556 K10 R
-245.372 C -409.67 F27.7778 K50 R
-217.594 C -359.67 F55.5556 K100 R
4.62778 C 40.33 F277.778 K500 R
282.406 C 540.33 F555.556 K1000 R
-40 C -40 F233.15 K419.67 R
-35 C -31 F238.15 K428.67 R
-25 C -13 F248.15 K446.67 R
-15 C 5 F258.15 K464.67 R
-10 C 14 F263.15 K473.67 R
-9 C 15.8 F264.15 K475.47 R
-8 C 17.6 F265.15 K477.27 R
0 C 32 F273.15 K491.67 R
4 C 39.2 F277.15 K498.87 R
5 C 41 F278.15 K500.67 R
10 C 50 F283.15 K509.67 R
25 C 77 F298.15 K536.67 R
30 C 86 F303.15 K545.67 R
31 C 87.8 F304.15 K547.47 R
32 C 89.6 F305.15 K549.27 R
33 C 91.4 F306.15 K551.07 R
34 C 93.2 F307.15 K552.87 R
35 C 95 F308.15 K554.67 R
36 C 96.8 F309.15 K556.47 R
36.1 C 96.98 F309.25 K556.65 R
36.2 C 97.16 F309.35 K556.83 R
36.3 C 97.34 F309.45 K557.01 R
36.4 C 97.52 F309.55 K557.19 R
36.5 C 97.7 F309.65 K557.37 R
36.6 C 97.88 F309.75 K557.55 R
36.7 C 98.06 F309.85 K557.73 R
36.8 C 98.24 F309.95 K557.91 R
36.9 C 98.42 F310.05 K558.09 R
36.10 C 96.98 F309.25 K556.65 R
36.12 C 97.016 F309.27 K556.686 R
36.13 C 97.034 F309.28 K556.704 R
36.14 C 97.052 F309.29 K556.722 R
36.15 C 97.070 F309.3 K556.74 R
36.16 C 97.088 F309.31 K556.758 R
36.17 C 97.106 F309.32 K556.776 R
36.18 C 97.124 F309.33 K556.794 R
36.19 C 97.142 F309.34 K556.812 R
36.20 C 97.160 F309.35 K556.83 R
36.21 C 97.178 F309.36 K556.848 R
36.22 C 97.196 F309.37 K556.866 R
36.23 C 97.214 F309.38 K556.884 R
36.24 C 97.232 F309.39 K556.902 R
36.25 C 97.250 F309.4 K556.92 R
36.26 C 97.268 F309.41 K556.938 R
36.27 C 97.286 F309.42 K556.956 R
36.28 C 97.304 F309.43 K556.974 R
36.29 C 97.322 F309.44 K556.992 R
36.30 C 97.340 F309.45 K557.01 R
36.31 C 97.358 F309.46 K557.028 R
36.32 C 97.376 F309.47 K557.046 R
36.33 C 97.394 F309.48 K557.064 R
36.34 C 97.412 F309.49 K557.082 R
36.35 C 97.430 F309.5 K557.1 R
36.36 C 97.448 F309.51 k557.118 R
36.37 C 97.466 F309.52 K557.136 R
36.38 C 97.484 F309.53 K557.154 R
36.39 C 97.502 F309.54 K557.172 R
36.40 C 97.520 F309.55 K557.19 R
36.41 C 97.538 F309.56 K557.208 R
36.42 C 97.556 F309.57 K557.226 R
36.43 C 97.574 F309.58 K557.244 R
36.44 C 97.592 F309.59 K557.262 R
36.45 C 97.610 F309.6 K557.28 R
46 C 114.8 F319.15 K574.47 R
47 C 116.6 F320.15 K576.27 R
48 C 118.4 F321.15 K578.07 R
49 C 120.2 F322.15 K579.87 R
50 C 122 F323.15 K581.67 R
51 C 123.8 F324.15 K583.47 R
55 C 131 F328.15 K590.67 R
60 C 140 F333.15 K599.67 R
70 C 158 F343.15 K617.67 R
75 C 167 F348.15 K626.67 R
80 C 176 F353.15 K635.67 R
85 C 185 F358.15 K644.67 R
90 C 194 F363.15 K653.67 R
95 C 203 F368.15 K662.67 R
98.6 C 209.48 F371.75 K669.15 R
100 C 212 F373.15 K671.67 R
200 C 392 F473.15 K851.67 R
500 C 932 F773.15 K1391.67 R
1000 C 1832 F1273.15 K2291.67 R

Fahrenheit to Celsius (f to centigrade, f to c) Conversion Table

Fahrenheit (f) Celsius / Centigrade (c)
0 F -17.78 C
41 F 5 C
20 F -6.67 C
25 F -3.889 C
30 F -1.112 C
32 F 0 C
33.799 F 1 C
35.6 F 2 C
35 F 1.6667 C
37 F 2.7778 C
39 F 3.89 C
40 F 4.44 C
45 F 7.22 C
46.4 F 8 C
48 F 8.889 C
50 F 10 C
51.8 F 11 C
53.6 F 12 C
55 F 12.778 C
55.4 F 13 C
57 F 13.889 C
57.2 F 14 C
59 F 15 C
60 F 15.555 C
61 F 16.11 C
60.8 F 16 C
62 F 16.66666 C
62.6 F 17 C
64 F 17.778 C
64.4 F 18 C
65 F 18.33 C
66 F 18.889 C
66.2 F 19 C
68 F 20 C
69.8 F 21 C
70 F 21.111 C
71 F 21.667 C
71.59 F 22 C
72 F 22.22 C
73 F 22.778 C
73.4 F 23 C
74 F 23.33 C
75 F 23.889 C
75.2 F 24 C
76 F 24.44 C
77 F 25 C
78 F 25.55 C
78.8 F 26 C
79 F 26.11 C
80 F 26.67 C
80.59 F 27 C
81 F 27.22 C
82 F 27.778 C
82.4 F 28 C
84 F 28.889 C
84.2 F 29 C
85 F 29.44 C
86 F 30 C
87.8 F 31 C
89.6 F 32 C
90 F 32.22 C
91.4 F 33 C
93.2 F 34 C
95 F 35 C
96.08 F 35.6 C
96.44 F 35.8 C
96.62 F 35.9 C
96.8 F 36 C
96.98 F 36.1 C
97 F 36.11 C
97.16 F 36.2 C
97.34 F 36.3 C
97.52 F 36.4 C
97.7 F 36.5 C
97.9 F 36.6 C
98 F 36.67 C
98.1 F 36.7 C
98.2 F 36.78 C
98.3 F 36.83 C
98.4 F 36.89 C
98.6 F 37 C
98.7 F 37.05 C
98.8 F 37.11 C
98.9 F 37.2 C
99 F 37.22 C
99.1 F 37.3 C
99.2 F 37.333 C
99.3 F 37.38 C
99.4 F 37.44 C
99.5 F 37.5 C
99.6 F 37.56 C
99.7 F 37.6 C
99.8 F 37.67 C
99.9 F 37.7 C
100 F 37.8 C
100.1 F 37.83 C
100.2 F 37.89 C
100.3 F 37.9 C
100.4 F 38 C
100.5 F 38.05 C
100.6 F 38.1 C
100.7 F 38.17 C
100.8 F 38.22 C
100.9 F 38.3 C
101 F 38.333 C
101.1 F 38.39 C
101.2 F 38.44 C
101.3 F 38.5 C
101.4 F 38.56 C
101.5 F 38.61 C
101.6 F 38.67 C
101.7 F 38.72 C
101.8 F 38.78 C
109.9 F 38.83 C
102 F 38.88 C
102.1 F 38.94 C
102.2 F 39 C
102.3 F 39.05 C
102.4 F 39.11 C
102.5 F 39.17 C
102.6 F 39.22 C
102.7 F 39.28 C
102.8 F 39.33 C
102.9 F 39.39 C
103 F 39.44 C
103.2 F 39.56 C
103.5 F 39.72 C
104 F 40 C
105 F 40.55 C
110 F 43.333 C
113 F 45 C
115 F 46.11 C
120 F 48.89 C
122 F 50 C
140 F 60 C
176 F 80 C
180 F 82.22 C
190 F 87.78 C
200 F 93.33 C
300 F 148.89 C
302 F 150 C
320 F 160 C
338 F 170 C
356 F 176.66 C
356 F 180 C
374 F 190 C
392 F 200 C
400 F 204.44 C
428 F 220 C
482 F 250 C
500 F 260 C
1000 F 537.78 C

Frequently Asked Questions on Degrees Celsius and Fahrenheit (CF Conversion)

• Heat is a form of energy and measured in Joules. It is transferred between systems based on temperature differences.
Temperature measures degree of heat and indicates 'hotness' or 'coldness' of a body. It is measured in Celsius, Fahrenheit or Kelvin.

• Celsius, Fahrenheit , Kelvin , Rankine are the units to measure temperature.
Celsius and Fahrenheit are non absolute degree based. Rankine and Kelvin are absolute measures. The metric unit for measuring temperature is Kelvin (K).
Celsius is commonly used in most countries. United States uses Fahrenheit scale.

• Celsius and Farhenheit are mostly used in measuring temperature used in day to day scenarios like body temperature, weather reports, domestic and factory appliances like oven, microwave , air conditioners, refrigerator settings .

• This is mostly used by scientists and science related areas.
It is an absolute measure of temperature. For eg, In Astronomy, it's more useful to indicate temperatures using Kelving scale where there are extremes of hot and cold temperatures.

• Lowest Temperature on Kelvin scale = 0K (no -ve) . These are theoretical limits.

• Highest Temperature or the Planck Temperature = 1.41683385 x 1032 Kelvin

• It is same as Kelvin scale and it's an absolute measure of the temperature.
Rankine is with respect to Fahrenheit scale. A Rankine is equal to 1 Fahrenheit.
Kelvin is with respect to Celsius scale. A Kelvin is equal to 1 Celsius degree.
0R = -459.67 F . 0K = -273.15 C . R = 5/9 K .

• Celsius and Fahrenheit are specified as degrees. They indicate increase or decrease against some calibrated scale reference.
Kelvin and Rankine are absolute measures starting at 0 value which indicates 'no' thermal energy and going up to max temperature.

• To convert from celsius to fahrenheit, multiple by 9/5 (1.8) and add 32 . F = (C x 9/5 ) + 32 .

• To convert from Fahrenheit to Celsius, subtract 32 and then multiple by 5/9 (0.55). C = (F-32 ) x 5/9 .

• Kelvin is same as Celsius with an offset of 273.15, °C = K − 273.15 . K = C + 273.15 .

• Use the formula for converting C to F and F to C and replace C by (K - 273.15 ).
F = ((K-273.15) x 9/5 ) + 32 . K = (F-32 x 5/9) + 273.15 .

• In the Celsius scale the freezing point of water is 0 °C and the boiling point is 100 °C .
In the Fahrenheit scale the freezing point of water is 32 °F and boiling point of water is 212 °F .
In the Kelvin scale, the freezing point of water is 273.15 K and boiling point of water is 373.15 Kelvin.
In the Rankine scale, the freezing point of water is 491.67 R and boiling point of water is 671.67 R .

• 98.6 F (37C) is considered as the average normal body temperature.
However there may be differences based on time of day and each individual person's baseline may be different.
The range considered as normal is between 97 F (36.1 C) and 99 F (37.2 C).

• Thermometer is the most commonly used one for normal temperature measurements.
There are other devices like Pyrometer , Infra red sensors, Resistance temperature detector (RTD), Thermocouples