Fahrenheit to Celsius Converter (°F to °C)

How to convert Fahrenheit to Celsius

°C = (°F − 32) × 5/9

To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit reading, then multiply by 5/9. Subtracting 32 first lines up the freezing points of the two scales (32°F = 0°C); the 5/9 factor then rescales the size of each degree.

Quick estimate: subtract 30 and halve the result. For 70°F: (70 − 30) ÷ 2 = 20°C (exact answer 21.1°C).

Worked examples

Convert 98.6°F (body temperature): 98.6 − 32 = 66.6; 66.6 × 5/9 = 37°C
Convert 72°F (room temperature): 72 − 32 = 40; 40 × 5/9 = 22.2°C
Convert 32°F: 32 − 32 = 0; 0 × 5/9 = 0°C (freezing point)

Fahrenheit to Celsius conversion table (°F to °C)

Fahrenheit (°F)	Celsius (°C)
-40°F	-40°C
-30°F	-34.44°C
-20°F	-28.89°C
-10°F	-23.33°C
0°F	-17.78°C
10°F	-12.22°C
20°F	-6.67°C
30°F	-1.11°C
40°F	4.44°C
50°F	10°C
60°F	15.56°C
70°F	21.11°C
80°F	26.67°C
90°F	32.22°C
100°F	37.78°C
110°F	43.33°C
120°F	48.89°C
130°F	54.44°C
140°F	60°C
150°F	65.56°C
160°F	71.11°C
170°F	76.67°C
180°F	82.22°C
190°F	87.78°C
200°F	93.33°C
210°F	98.89°C
220°F	104.44°C

Reference temperatures in °F and °C

Reference point	°F	°C
Absolute zero	-459.67°F	-273.15°C
Arctic winter day	-22°F	-30°C
Home freezer	-0.4°F	-18°C
Water freezes / ice melts	32°F	0°C
Refrigerator	37.4°F	3°C
Cool spring day	50°F	10°C
Comfortable room	69.8°F	21°C
Summer afternoon	86°F	30°C
Normal body temperature	98.6°F	37°C
Hot bath	104°F	40°C
Death Valley record heat	134.06°F	56.7°C
Water boils (sea level)	212°F	100°C
Moderate oven	356°F	180°C

Frequently asked questions

What is 70 degrees Fahrenheit in Celsius?

70°F equals 21.1°C - comfortable room temperature.

What is 100 degrees Fahrenheit in Celsius?

100°F equals 37.8°C. As a body temperature it is just below the 100.4°F (38°C) fever threshold; as weather it is a genuinely hot day.

Why does the formula subtract 32 first?

Because the scales are offset: water freezes at 32°F but 0°C. Removing the offset first lets the 5/9 ratio convert the degree sizes correctly.