Celsius to Fahrenheit Converter

Convert °C to °F for weather forecasts, recipes, thermostats and body temperature, with a full conversion chart and a mental-math shortcut.

°F = °C × 1.8 + 32

Celsius

Result will appear here...

Celsius to Fahrenheit Chart

Every 5°C from −40°C to 100°C. Each 5°C step is exactly 9°F, so you can count between rows.

Celsius temperatures from −40 to 100 converted to Fahrenheit
°C	°F
-40°C	-40°F
-35°C	-31°F
-30°C	-22°F
-25°C	-13°F
-20°C	-4°F
-15°C	5°F
-10°C	14°F
-5°C	23°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
55°C	131°F
60°C	140°F
65°C	149°F
70°C	158°F
75°C	167°F
80°C	176°F
85°C	185°F
90°C	194°F
95°C	203°F
100°C	212°F

The Formula and Why It Has Two Steps

Celsius and Fahrenheit disagree on two things, so the conversion has two steps:

Degree size. Between water's freezing and boiling points there are 100 Celsius degrees but 180 Fahrenheit degrees. That makes one Celsius degree 1.8 (9/5) Fahrenheit degrees.
Starting point. Water freezes at 0°C but 32°F, so after scaling you add 32.

°F = °C × 1.8 + 32

°C = (°F − 32) ÷ 1.8

Order matters in the reverse direction: subtract 32 first, then divide. Doing it the other way round is the most common reason a hand conversion comes out wrong.

Converting Celsius to Fahrenheit in Your Head

Quick estimate: double it and add 30

22°C → 44 + 30 = 74°F (exact: 71.6°F). It's exact at 10°C and within 2°F between 0°C and 20°C. Above that it runs high, by 4°F at 30°C and 6°F at 40°C.

Exact: double it, take off 10%, add 32

25°C → 50, minus 5 is 45, plus 32 is 77°F. Doubling and removing 10% is the same as multiplying by 1.8, so this gives the exact answer.

Worked Example: Is 38°C a Fever?

A thermometer set to Celsius reads 38°C, and you're used to Fahrenheit.

38 × 1.8 = 68.4

68.4 + 32 = 100.4°F

100.4°F is the threshold commonly used to define a fever, so 38°C is a fever. Normal body temperature is usually quoted as 37°C (98.6°F), although healthy readings vary by person, time of day and where the temperature is taken.

Weather Temperatures in °C and °F

Common weather temperatures in Celsius and Fahrenheit with a description
°C	°F	What it feels like
-20°C	-4°F	Severe cold; exposed skin is at risk of frostbite in wind
-10°C	14°F	Hard freeze
0°C	32°F	Freezing point; ice on roads
10°C	50°F	Cool; jacket weather
20°C	68°F	Mild; typical indoor room temperature
25°C	77°F	Warm
30°C	86°F	Hot
35°C	95°F	Very hot; heat-stress risk rises
40°C	104°F	Extreme heat

Oven Temperatures: °F to °C

US recipes use Fahrenheit, while most other countries bake in Celsius. These are the settings you'll see most often.

Common oven temperatures in Fahrenheit and Celsius
°F	°C	Oven feel
275°F	135°C	Low, slow-roasting
300°F	149°C	Low
325°F	163°C	Moderate-low
350°F	177°C	Moderate, most baking
375°F	191°C	Moderate-high
400°F	204°C	Hot
425°F	218°C	Hot, roasting vegetables
450°F	232°C	Very hot, pizza and bread

Rounded to the nearest whole degree. Recipes often round 350°F (176.7°C) to 175°C or 180°C, and either works fine in a home oven.

Frequently asked questions

When are Celsius and Fahrenheit the same number?

At −40. −40°C and −40°F are the same temperature, the only point where the two scales cross.

Is a 10 degree change the same in Celsius and Fahrenheit?

No. A rise of 10°C is a rise of 18°F. For temperature differences you only multiply by 1.8. The +32 applies to readings, not changes, so a forecast saying "5°C warmer than yesterday" means 9°F warmer.

Why does the US still use Fahrenheit?

Mostly habit and the cost of switching. Fahrenheit was already standard in the US before Celsius became the international norm. Replacing signage, thermostats and everyday familiarity has kept it in place, even though US science and medicine use Celsius.