Fahrenheit to Celsius Converter
A Canadian student visiting Florida for spring break checks the local TV weather and sees a forecast high of 84 degrees, which she knows is hot but only translates into the 28.9 degrees Celsius that means anything to her body's calibration after two decades north of the border. Fahrenheit-to-Celsius is the conversion direction that runs through every American oven recipe being tested by a European cook, every imported American fitness equipment specification (treadmill speeds and incline heating values), every international student arriving on an American campus, and every sports-physiology lab translating Fahrenheit-recorded environmental data into Celsius-default scientific publications. The reverse formula C = (F − 32) × 5/9 reverses the multiplication and the offset of the forward conversion, with the subtraction-first ordering being important because the formula is not commutative.
Calculator
(1 × 0.5555555556) − 17.7777777778 = -17.2222
Formula
Subtract 32 from Fahrenheit, then multiply the result by 5/9 (or equivalently divide by 1.8) to get Celsius. So 32 °F equals 0 °C (water freezes), 212 °F equals 100 °C (water boils), and 98.6 °F equals 37 °C (normal body temperature). The mental shortcut is: subtract 30 from Fahrenheit and halve the result. That gives a passable approximation in the everyday-weather range — 80 °F yields 25 °C exactly using this trick (precise answer: 26.7 °C, so the trick underestimates by about 1.7 °C in summer weather). Power users memorize anchors like 70 °F = 21 °C, 75 °F = 24 °C, and 60 °F = 15.6 °C for thermostat and weather conversations.
Where You'll Use This
International recipe testing is one of the largest professional uses of this conversion. Food bloggers and cookbook authors who publish in English-speaking markets need their oven temperatures to translate cleanly between the American 350 °F (177 °C) standard baking temperature and the European 180 °C dial markings that almost match. Test kitchens at international food publishers run the conversion thousands of times per year across cookbook revisions and recipe localization. Sports broadcasting from American venues to international audiences translates field temperatures from Fahrenheit to Celsius in real-time graphics during weather-affected events. International medical practice receiving travelers presenting with American-recorded fever readings converts on the fly to plot the temperature curve in the Celsius-default European chart. Aviation weather products published by the FAA in Fahrenheit translate to Celsius for pilots flying internationally where ICAO-standard meteorological reports use Celsius. Even imported American kitchen equipment sold internationally — air fryers, convection ovens, sous-vide circulators — has to translate the user-facing Fahrenheit dial labels into Celsius for European compliance.
Reference Table
| From (Fahrenheit) | To (Celsius) |
|---|---|
| -40 | -40 |
| 0 | -17.7778 |
| 10 | -12.2222 |
| 20 | -6.6667 |
| 32 | 0 |
| 40 | 4.4444 |
| 50 | 10 |
| 60 | 15.5556 |
| 65 | 18.3333 |
| 68 | 20 |
| 70 | 21.1111 |
| 72 | 22.2222 |
| 75 | 23.8889 |
| 80 | 26.6667 |
| 85 | 29.4444 |
| 90 | 32.2222 |
| 95 | 35 |
| 98.6 | 37 |
| 100 | 37.7778 |
| 110 | 43.3333 |
| 150 | 65.5556 |
| 200 | 93.3333 |
| 300 | 148.8889 |
| 400 | 204.4444 |
| 500 | 260 |
A Bit of History
The Fahrenheit scale was published in 1724 by Daniel Gabriel Fahrenheit, a Polish-born German physicist working in the Netherlands. He set zero at the temperature of an ice-and-ammonium-chloride brine bath (the coldest reproducible temperature available in his lab), thirty-two at the freezing point of pure water, and ninety-six at the temperature of the human body — three reference points that produced the somewhat awkward 180-degree gap between freezing and boiling water that Celsius would later replace with a clean 100-degree gap. The Fahrenheit scale survives in everyday American use largely because it had a head start of nearly two decades on Celsius and was adopted by colonial American institutions that never had the political appetite for metric conversion that European countries faced after the French Revolution.
FAQ
What is 100 °F in Celsius?
One hundred degrees Fahrenheit equals 37.78 °C — just over normal body temperature. A 100 °F environmental temperature is hot summer weather in the desert Southwest of the United States and the equivalent Celsius figure of nearly 38 lands in the Australian or Saharan summer-extreme range.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit value, then multiply by 5/9 (or divide by 1.8). For mental math, subtract 30 and halve — that gives a passable estimate in the everyday weather range. So 70 °F estimates as (70-30)/2 = 20 °C, close to the true 21.1 °C.
What is 350 °F in Celsius?
Three hundred fifty degrees Fahrenheit equals 176.67 °C — the standard American baking temperature for cookies, cakes, and casseroles. European ovens dial in increments of 10, so most home cooks set the closest match of 175 °C or 180 °C and don't worry about the small difference.
What temperature is 32 °F in Celsius?
Thirty-two degrees Fahrenheit equals exactly 0 °C — the freezing point of water, where ice and liquid water coexist in equilibrium at standard atmospheric pressure. This is the cleanest anchor point in temperature conversion.