Celsius to Fahrenheit Converter

Popular Celsius to Fahrenheit conversions

• 0 °C32 °F0 Celsius to Fahrenheit
• 10 °C50 °F10 Celsius to Fahrenheit
• 18 °C64.4 °F18 Celsius to Fahrenheit
• 20 °C68 °F20 Celsius to Fahrenheit
• 22 °C71.6 °F22 Celsius to Fahrenheit
• 25 °C77 °F25 Celsius to Fahrenheit
• 30 °C86 °F30 Celsius to Fahrenheit
• 35 °C95 °F35 Celsius to Fahrenheit
• 36 °C96.8 °F36 Celsius to Fahrenheit
• 37 °C98.6 °F37 Celsius to Fahrenheit
• 38 °C100.4 °F38 Celsius to Fahrenheit
• 39 °C102.2 °F39 Celsius to Fahrenheit
• 40 °C104 °F40 Celsius to Fahrenheit
• 100 °C212 °F100 Celsius to Fahrenheit
• 180 °C356 °F180 Celsius to Fahrenheit
• 200 °C392 °F200 Celsius to Fahrenheit

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Celsius to Fahrenheit formula

Fahrenheit degrees are smaller than Celsius degrees: the 100 Celsius degrees between the freezing and boiling points of water span 180 Fahrenheit degrees, so each Celsius degree is 180/100 = 9/5 (1.8) Fahrenheit degrees. The Fahrenheit scale also starts higher — water freezes at 32 °F instead of 0 °C — which is why you add 32 after multiplying.

Learn more about the Celsius to Fahrenheit formula →

How to convert Celsius to Fahrenheit

1. Multiply the Celsius temperature by 9/5 (or 1.8).
2. Add 32 to the result.
3. The answer is the temperature in degrees Fahrenheit.

Worked examples

Read the full step-by-step guide →

Common temperature conversions

Open the full Celsius to Fahrenheit chart →

Celsius and Fahrenheit: how the two scales work

A temperature scale needs two things: a zero point and a size for one degree. Celsius and Fahrenheit disagree on both, which is why converting between them takes a multiplication and an addition rather than a single factor like centimetres to inches.

The Celsius scale puts the freezing point of water at 0 °C and its boiling point at 100 °C, at standard sea-level pressure. Those hundred steps made it a natural partner for the metric system, and it is now used for weather, cooking and medicine in almost every country. In science it is tied directly to the kelvin: a change of one degree Celsius is exactly a change of one kelvin, and 0 °C is 273.15 K.

The Fahrenheit scale puts the same two points at 32 °F and 212 °F, so there are 180 degrees between them instead of 100. Each Fahrenheit degree is therefore smaller — 100/180, or 5/9, of a Celsius degree. Fahrenheit is the everyday scale in the United States and a handful of other places, so you will meet it in American recipes, weather reports, thermostats, car manuals and medical thermometers.

Put those two facts together and the conversion follows: scale the number by 9/5 to account for the smaller degree, then add 32 to move the zero point. That is all the converter above does, with no rounding until the final display.

A short history of both scales

Daniel Gabriel Fahrenheit, a German-born instrument maker working in the Dutch Republic, published his scale in 1724. He was famous for reliable mercury thermometers, and he set his zero at the coldest temperature he could produce reliably in the workshop — a mixture of ice, water and salt — with human body temperature near the top of his original range. The scale was later adjusted so that water froze at exactly 32 and boiled at exactly 212, which is why normal body temperature now works out to 98.6 °F rather than a round number.

The Swedish astronomer Anders Celsius proposed his scale in 1742 — but upside down: water boiled at 0 and froze at 100. Shortly after his death the scale was flipped to the form used today. For two centuries it was usually called the centigrade scale (from the Latin for “hundred steps”); the international General Conference on Weights and Measures renamed it “Celsius” in 1948.

Through the twentieth century most countries switched their weather and everyday measurements to Celsius as they adopted the metric system. The United States kept Fahrenheit for daily life, although American scientists, doctors and engineers use Celsius and kelvin routinely.

Temperature reference points in Celsius and Fahrenheit

These landmarks make it easier to sense whether a converted number is sensible. If your result is far from where you expect it to fall in this list, check the input and the direction of conversion.

Celsius to Fahrenheit for weather

Weather is where most people need this conversion — reading a forecast abroad, or explaining your own climate to someone who uses the other scale. A useful rule of thumb is that every 5 °C step is a 9 °F step, so once you remember that 10 °C is 50 °F and 20 °C is 68 °F you can count up or down in your head.

Remember that air temperature is only part of the story. Wind makes cold weather feel colder and humidity makes heat feel worse; for those, use the wind chill calculator and the heat index calculator.

Oven and cooking temperatures

Recipes are the second big reason for converting. American recipes give oven settings in Fahrenheit, most others use Celsius, and older British recipes often use gas marks. Oven dials are not precise, so recipe conversions are normally rounded to the nearest 10 °C — 350 °F becomes 180 °C even though the exact figure is 176.7 °C.

Fan (convection) ovens move hot air around the food and cook faster, so recipes written for a conventional oven are usually reduced by about 20 °C for a fan oven. For sugar work and deep-frying, where a few degrees matter, use an accurate probe thermometer and the exact conversion rather than a rounded one — see the candy temperature converter and the oven temperature converter.

Body temperature in Celsius and Fahrenheit

Medical thermometers sold in different countries read in different scales, so it is common to need 37 °C (98.6 °F) or 38 °C (100.4 °F) converted quickly. A healthy adult temperature is usually somewhere around 36.1–37.2 °C (97–99 °F) and changes during the day, with age, and with where the reading is taken — mouth, ear, forehead or armpit readings all differ slightly.

A reading of 38 °C (100.4 °F) or higher is widely used as the threshold for a fever. Because the conversion multiplies by 1.8, small differences grow: a rise of 1.5 °C is a rise of 2.7 °F. When you record readings, write down the scale as well as the number.

This information is general and not medical advice. If you are worried about a temperature, especially in a baby, an older person or someone who is unwell, contact a healthcare professional. See also the body temperature converter and fever temperature chart.

Converting a temperature change (not a temperature)

One of the most common mistakes is using the full formula on a difference between two temperatures. If a forecast says it will be 10 °C warmer tomorrow, that is not 50 °F warmer — it is 18 °F warmer. The +32 only applies to a reading on the thermometer, because it moves the zero point; a change in temperature has no zero point to move.

So, to convert a change, multiply by 1.8 and stop. This matters in climate reporting (a 1.5 °C rise in global average temperature is a 2.7 °F rise), in fever readings and in engineering specifications such as “accurate to ±0.5 °C”, which means ±0.9 °F.

Which countries use Fahrenheit?

Fahrenheit remains the everyday scale in the United States and its territories, and is also used in a few other places with close historical or economic ties to the US, such as the Bahamas, Belize, the Cayman Islands, Palau, the Federated States of Micronesia, the Marshall Islands and Liberia. Almost everywhere else uses Celsius for weather and cooking.

Some countries mix the two informally. In the United Kingdom, for example, forecasts are in Celsius, but older people sometimes still describe a summer heatwave in Fahrenheit. Canada uses Celsius for weather, while ovens, pools and recipes sometimes still show Fahrenheit because many appliances are made for the American market.

Accuracy and rounding

The conversion is exact: 9/5 is precisely 1.8, so there is no rounding error in the formula itself. Rounding only happens when the result is displayed. This converter shows two decimal places by default — use the Decimals selector to show more or fewer.

How many decimals you need depends on the job. Weather and oven settings are fine as whole numbers; body temperature is normally given to one decimal place; laboratory work may need two or more. As a rule, round only once, at the very end — rounding an intermediate step and then multiplying by 1.8 can push the final answer off by a tenth of a degree or more.

Frequently asked questions