°F → °C: °C = (°F − 32) × 5/9
°C = (°F − 32) × 5/9; 0 °F = -17.7778 °C, 100 °F = 37.7778 °C. The other way round: 0 °C = 32 °F. Daniel Gabriel Fahrenheit proposed his scale in 1724: water freezes at 32 °F and boils at 212 °F. The US uses it for weather and cooking; at −40 both scales read the same. On the Celsius scale water freezes at 0 °C and boils at about 100 °C at sea level. It is named after the Swedish astronomer Anders Celsius (1742) and used almost everywhere.
Fahrenheit to celsius conversion table
-40 °F = -40 °C · -20 °F = -28.8889 °C · -10 °F = -23.3333 °C · 0 °F = -17.7778 °C · 5 °F = -15 °C · 10 °F = -12.2222 °C · 15 °F = -9.4444 °C · 20 °F = -6.6667 °C · 25 °F = -3.8889 °C · 30 °F = -1.1111 °C · 35 °F = 1.6667 °C · 36.6 °F = 2.5556 °C · 37 °F = 2.7778 °C · 40 °F = 4.4444 °C · 50 °F = 10 °C · 60 °F = 15.5556 °C · 80 °F = 26.6667 °C · 100 °F = 37.7778 °C · 180 °F = 82.2222 °C · 200 °F = 93.3333 °C
How to convert fahrenheit to celsius
Formula: °C = (°F − 32) × 5/9. Example: 98.6 °F = 37 °C.
Unit Converter
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- 1Pick a category — length, weight, temperature, volume, area, speed, data, time, pressure or energy.
- 2Choose the “from” and “to” units, or press swap to reverse them.
- 3Type a value in either field — the other side updates as you type.
- 4Adjust the decimal precision and check the conversion table for common values.
Exact conversion factors
Many imperial units are defined exactly in metric terms: 1 inch = 2.54 cm, 1 foot = 0.3048 m, 1 mile = 1.609344 km, 1 pound = 0.45359237 kg and 1 US gallon = 3.785411784 litres. The converter uses these definitions, so results are as precise as the decimals you choose to show. The formula is displayed in words — for example “multiply by 2.54” — so you can repeat the calculation by hand.
Temperature is different
Celsius, Fahrenheit and Kelvin do not share a zero point, so temperature cannot be converted with a single factor. °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9; Kelvin is Celsius + 273.15. That is why 0 °C is 32 °F, while a 10-degree change in Celsius is an 18-degree change in Fahrenheit.
US vs UK units and data sizes
A US gallon (3.785 L) is smaller than an imperial UK gallon (4.546 L), and US fluid ounces differ slightly from UK ones — check which system your recipe or spec uses. For data sizes, storage makers use decimal units (1 GB = 1,000 MB), while operating systems often count in binary units (1 GiB = 1,024 MiB), which is why a new drive shows less capacity than the label.
Frequently asked questions
How many centimetres are in an inch?
Exactly 2.54 cm. To convert cm to inches, divide by 2.54.
How do I convert kg to pounds?
Multiply kilograms by about 2.20462. One pound is exactly 0.45359237 kg.
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32. For example, 20 °C × 1.8 + 32 = 68 °F.
Can I convert in both directions?
Yes. Type in either field and the other updates, or press swap to switch the units.
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