Fahrenheit to Celsius Converter
Convert Fahrenheit to Celsius instantly, then run the reverse Celsius to Fahrenheit conversion in the same tool. Type in any box and Fahrenheit, Celsius, and Kelvin all update at once. Includes the F to C formula, a US oven temperature reference, a weather guide, and a body temperature chart.
°F = (0 × 9/5) + 32 = 32°F
US oven temperatures in Celsius
Standard US baking and roasting temperatures converted to metric for European, Australian, and Asian ovens.
| Fahrenheit (°F) | Celsius (°C) | Common use |
|---|---|---|
| 200°F | 93.3°C | Slow cooking, keeping warm |
| 225°F | 107°C | Smoking, very slow roast |
| 250°F | 121°C | Long slow cooking, jerky |
| 300°F | 149°C | Slow baking, meringues |
| 325°F | 163°C | Cheesecake, custards |
| 350°F | 177°C | Standard baking (cakes, cookies) |
| 375°F | 191°C | Pies, sweet breads |
| 400°F | 204°C | Roasting vegetables, pizza |
| 425°F | 218°C | Crispy potatoes, hot roasting |
| 450°F | 232°C | Bread crust, pizza (high heat) |
| 500°F | 260°C | Broiling, pizza ovens |
US weather temperatures in Celsius
What common Fahrenheit weather readings mean in metric Celsius.
| Fahrenheit (°F) | Celsius (°C) | Feels like |
|---|---|---|
| 0°F | -17.8°C | Bitter cold (Midwest winter) |
| 20°F | -6.7°C | Cold winter day |
| 32°F | 0°C | Freezing point |
| 50°F | 10°C | Cool spring or autumn day |
| 65°F | 18.3°C | Cool, light jacket weather |
| 70°F | 21.1°C | Comfortable room temperature |
| 80°F | 26.7°C | Warm summer day |
| 90°F | 32.2°C | Hot summer day |
| 100°F | 37.8°C | Extreme heat (Phoenix summer) |
| 110°F | 43.3°C | Dangerous heat (Death Valley) |
Body temperature: Fahrenheit to Celsius
Quick reference for clinical thermometer readings.
| Fahrenheit (°F) | Celsius (°C) | Medical meaning |
|---|---|---|
| 96.8°F | 36.0°C | Low end of normal |
| 97.7°F | 36.5°C | Normal (resting) |
| 98.6°F | 37.0°C | Average normal body temp |
| 99.5°F | 37.5°C | Mildly elevated |
| 100.4°F | 38.0°C | Fever threshold (CDC) |
| 101.3°F | 38.5°C | Moderate fever |
| 102.2°F | 39.0°C | High fever, see a doctor |
| 104°F | 40.0°C | Dangerous, urgent care |
| 105.8°F | 41.0°C | Medical emergency |
What this converter does
All 3 scales
Fahrenheit, Celsius, and Kelvin update at the same time.
Click any scale
Input from Fahrenheit, Celsius, or Kelvin. The other two follow instantly.
US oven temperature reference
Common US recipe temperatures (325°F, 350°F, 400°F) converted to °C.
Quick presets
Tap freezing, body temp, boiling for instant common values.
Formula shown
See the live °C = (°F - 32) x 5/9 calculation as you type.
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When you need Fahrenheit to Celsius
US recipes for metric ovens
American recipes use Fahrenheit oven temperatures (350°F, 400°F). Convert these to Celsius (180°C, 200°C) for ovens with metric dials.
US weather forecasts
Visiting or relocating to the US? Weather forecasts there are in Fahrenheit. Convert to Celsius to know what to expect (75°F = 24°C, pleasant).
Body temperature checks
US clinical thermometers display Fahrenheit. Convert to Celsius for international medical records or to discuss with metric-using doctors.
US thermostat readings
Air-conditioning and heating in US homes is set in Fahrenheit. Know what 72°F feels like in metric terms (22.2°C, room temperature).
Cooking temperature charts
Food safety guidelines in US health publications use Fahrenheit. Convert to Celsius for HACCP records used internationally.
Science homework and conversions
Physics and chemistry problems often mix Fahrenheit, Celsius, and Kelvin. Convert all three at once with our tool.
About Fahrenheit and Celsius
The Fahrenheit to Celsius formula
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit value, then multiply by 5/9 (or divide by 1.8). Example: 100°F. 100 minus 32 = 68. 68 times 5/9 = 37.78°C. The reason for the offset (subtracting 32) is that Fahrenheit places freezing at 32 instead of 0. The 5/9 ratio adjusts for the different size of each degree on the two scales. This single F to C formula covers every conversion, from weather readings to oven settings.
How to convert Celsius to Fahrenheit
The Celsius to Fahrenheit conversion reverses the steps: multiply the Celsius value by 9/5 (the same as 1.8), then add 32. For example, 20°C times 1.8 = 36, and 36 plus 32 = 68°F. The c to f direction is the one most travelers and cooks need when reading metric forecasts or recipes, and the swap control on the converter above flips between f to c and c to f without retyping anything.
Common temperature conversions to know
A few worked examples cover the queries people search most. 20 degrees Fahrenheit to Celsius is (20 minus 32) times 5/9, which equals -6.7°C, a cold winter reading. 30 degrees Fahrenheit to Celsius works out to -1.1°C, just below freezing. Going the other way, 40 c to f is (40 times 1.8) plus 32 = 104°F, a dangerous heat level. For cooking, 180 c to f is 356°F and 200 c to f is 392°F, which line up with standard moderate and hot oven settings.
Fahrenheit and Celsius for oven temperatures
Oven dials are one of the most common reasons people convert between the two scales. American recipes are written in Fahrenheit, while ovens in Europe, Australia, and much of Asia use Celsius. A US recipe calling for 350°F translates to roughly 177°C, often rounded to 180°C on a metric dial. The oven temperature table higher on this page lists every common baking and roasting setting so you can match a recipe to your oven in seconds.
The history of Fahrenheit
Daniel Gabriel Fahrenheit, a German physicist, developed his temperature scale in 1724 using three reference points: a freezing salt-water mixture at 0°F, pure-water freezing at 32°F, and human body temperature near 96°F (later refined to 98.6°F). His mercury thermometer was the first reliable clinical instrument and saw rapid adoption in Britain and its colonies, including what became the United States.
Why most countries use Celsius today
The Celsius scale, developed by Anders Celsius in 1742, places water's freezing and boiling points at 0 and 100, which are intuitive reference points. The metric system, which adopted Celsius, swept Europe, Asia, and most of Africa during the 19th and 20th centuries. The US, Liberia, and Myanmar are the only three countries still using Fahrenheit for everyday measurements, which is why a Fahrenheit to Celsius converter stays useful for travel, cooking, and study.
Where Kelvin fits in
Kelvin is the scientific temperature scale and shares the same degree size as Celsius, so you convert Celsius to Kelvin by adding 273.15. Absolute zero, the coldest temperature physically possible, is 0 K, which equals -273.15°C or -459.67°F. The converter on this page shows Fahrenheit, Celsius, and Kelvin together, which is handy for physics and chemistry homework that mixes all three scales.
Why -40 matches in both scales
At -40 degrees, both Fahrenheit and Celsius show the same reading. This is the only crossover point. The math works out because (°F - 32) x 5/9 = °F is only true at -40. It has no practical significance in daily life but appears often in trivia.
Why this matters for cooking and health
Cooking and medical thermometer readings are the most common reasons people convert temperature daily. A US recipe that says "Bake at 350°F for 30 minutes" means 177°C for European ovens. A clinical thermometer showing 102°F means a serious fever of 38.9°C. Knowing both scales fluently is essential for international travelers, food bloggers, and anyone with family in different metric and imperial countries.
Subtract 32 from the Fahrenheit value, then multiply by 5/9 (or divide by 1.8). For example, 100°F - 32 = 68. 68 x 5/9 = 37.78°C. Our converter does this instantly.
100°F equals 37.78°C. This is close to normal human body temperature (98.6°F = 37°C). On a thermostat or weather forecast, 100°F means very hot, dangerous-heat conditions.
98.6°F equals exactly 37°C. This is the established average human body temperature. Modern research shows normal can range from 36.1°C to 37.2°C (97 to 99°F).
350°F equals 176.67°C, commonly rounded to 180°C for baking recipes. This is the standard temperature for cakes, cookies, and most everyday baking.
400°F equals 204.44°C, commonly rounded to 200°C. This is used for roasting vegetables, pizza, and crispier baking. European/metric recipes often write this as 200°C.
70°F equals 21.11°C. This is a comfortable room temperature, considered pleasant in most climates. Most central heating systems are set around this point.
Subtract 30, then divide by 2. Example: 80°F. Subtract 30 = 50. Half = 25°C. The exact answer is 26.67°C. The shortcut is off by a few degrees but good for quick weather estimates.
32°F equals exactly 0°C. This is the freezing point of water. At this temperature, water transitions from liquid to ice.
212°F equals exactly 100°C. This is the boiling point of water at sea level.
Fahrenheit was invented by Daniel Gabriel Fahrenheit in 1724 and was widely adopted in the British colonies. When most countries switched to Celsius (metric system) in the 19th and 20th centuries, the US did not officially mandate the change. Daily weather, oven temperatures, and body temperature in the US remain in Fahrenheit.
Multiply the Celsius value by 9/5 (or 1.8), then add 32. For example, 25°C x 1.8 = 45, and 45 + 32 = 77°F. This is the exact reverse of the Fahrenheit to Celsius formula, and the swap button on our converter handles it instantly.
20°F equals -6.7°C. The calculation is (20 - 32) x 5/9. This is a cold winter temperature, well below the freezing point of water.
30°F equals -1.1°C. The math is (30 - 32) x 5/9. This sits just below freezing, so expect ice and frost at this temperature.
40°C equals 104°F. The calculation is (40 x 1.8) + 32. This is a dangerously high temperature, whether it is a heat wave or a serious fever reading.
180°C equals 356°F. This is the metric equivalent of a standard moderate oven and lines up closely with the common US setting of 350°F used for cakes and cookies.
200°C equals 392°F. This is a hot oven setting, often rounded to 400°F in US recipes. It is used for roasting vegetables, crisping potatoes, and baking pizza.
The correct spellings are Celsius and Fahrenheit. Common misspellings such as celcius and farenheit refer to the same scales, so a converter will still give the right answer regardless of how the words are typed.