Enter a temperature in degrees Celsius to get it in Fahrenheit, with the formula worked through, the same temperature in Kelvin, and a quick way to check it in your head.
25 °C in Fahrenheit
77 °F
Kelvin
298.15 K
°F = °C × 9/5 + 32: 25 × 9/5 + 32 = 77.
A quick check: double it and add 30 gives 80 °F, close to the exact 77 °F for everyday temperatures.
Multiply the Celsius temperature by 9, then divide by 5 (the same as multiplying by 1.8).
Add 32 to get degrees Fahrenheit.
Worked example
A summer day of 30 °C: 30 × 9 ÷ 5 = 54, and 54 + 32 = 86 °F. A fridge at 4 °C is 39.2 °F, and a freezer at −18 °C is −0.4 °F.
Celsius to Fahrenheit chart
Celsius to Fahrenheit, rounded to 2 decimals
°C
°F
−40 °C
−40 °F
−20 °C
−4 °F
−10 °C
14 °F
0 °C
32 °F
5 °C
41 °F
10 °C
50 °F
15 °C
59 °F
20 °C
68 °F
25 °C
77 °F
30 °C
86 °F
35 °C
95 °F
40 °C
104 °F
45 °C
113 °F
50 °C
122 °F
60 °C
140 °F
70 °C
158 °F
80 °C
176 °F
90 °C
194 °F
100 °C
212 °F
180 °C
356 °F
200 °C
392 °F
220 °C
428 °F
250 °C
482 °F
The formula follows from the scales' definitions: water freezes at 0 °C and 32 °F and boils at 100 °C and 212 °F at sea level. Everything runs in your browser.
Frequently asked questions
What is the formula to convert Celsius to Fahrenheit?
Multiply by 9/5 (or 1.8) and add 32: °F = °C × 9/5 + 32. For 25 °C, 25 × 1.8 = 45, and 45 + 32 = 77 °F.
What is 37 °C in Fahrenheit?
98.6 °F. 37 °C is the figure usually given for normal body temperature, and 38 °C is 100.4 °F.
Is there a quick way to convert °C to °F in my head?
Double it and add 30. It's exact at 10 °C (50 °F) and stays within a few degrees for weather temperatures: 20 °C gives 70 against the exact 68 °F, 30 °C gives 90 against 86 °F. For cooking and science, use the exact formula.
At what temperature are Celsius and Fahrenheit the same?
At −40: −40 °C is exactly −40 °F. Above that, the Fahrenheit number is always the bigger one.
What is 180 °C in Fahrenheit for an oven?
356 °F. Recipes usually round it to 350 °F, and 200 °C (392 °F) to 400 °F; ovens aren't accurate to a few degrees anyway.
What are 0 °C and 100 °C in Fahrenheit?
0 °C is 32 °F, where water freezes, and 100 °C is 212 °F, where it boils at sea level. That 100-degree span is 180 degrees in Fahrenheit, which is where the 9/5 comes from.
