Convert Celsius to Fahrenheit (°C → °F)
Celsius is the global temperature standard for weather, science, and daily life outside the United States.
Celsius to Fahrenheit Conversion Table
10 common values| Celsius | Fahrenheit |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 100 °C | 212 °F |
| 200 °C | 392 °F |
How to Convert Celsius to Fahrenheit Manually
Step by StepTemperature scales differ in both zero-point and degree size, so conversion uses a formula — not simple multiplication. Follow these steps to convert degrees Celsius to degrees Fahrenheit by hand.
- 1Take your value in degrees CelsiusStart with the number of degrees Celsius (°C) you want to convert.
- 2Apply the formulaUse the formula:
°F = (°C × 9/5) + 32 - 3Read the result in degrees FahrenheitThe result is your value in degrees Fahrenheit (°F).
Formula
Temperature conversion uses an offset formula, not simple multiplication.
°F = (°C × 9/5) + 32°C = (°F − 32) × 5/9Tips
Use these in everyday conversions- 0 °C = freezing; 100 °C = boiling. Easy anchor points.
- Mental F conversion: double the °C and add 30 (rough). 20 °C → 70 °F (actual 68).
- Medical thermometers show 0.1 °C resolution — a rise from 37.0 to 37.5 matters.
Common Mistakes
Avoid these- Using "degrees centigrade" — the scale was renamed Celsius in 1948.
- Assuming a linear relationship between °C and °F without the +32 offset.
- Interpreting UK winter forecasts in °F by habit — UK uses °C.
About Celsius and Fahrenheit
What is the Celsius?
Celsius is the global temperature scale used for weather forecasts, science, medicine, and daily life in all countries except the United States. Originally proposed by Swedish astronomer Anders Celsius in 1742 (with 0° as boiling and 100° as freezing — the inverse of today's scale), the modern version was reversed shortly after his death. Since 2019, Celsius has been redefined via the Kelvin scale: 0°C is exactly 273.15 K, and 1°C equals 1 K in size. Water freezes at 0°C, boils at 100°C at sea level, and human body temperature is around 37°C. Comfortable room temperature is about 20–22°C, and a hot summer day is 30–35°C. Celsius relates to Fahrenheit by the formula °F = °C × 9/5 + 32, and to Kelvin by adding 273.15. The scale's decimal-friendly division of water's phase transitions made it the natural metric choice.
- Daily weather forecasts worldwide (except US)
- Cooking temperatures in Europe, Asia, Latin America
- Body temperature on medical thermometers
Room temperature is about 20 °C. Normal body temperature is 37 °C. Typical fridge setting is 4 °C. European winter can reach −20 °C; desert summer 45+ °C.
What is the Fahrenheit?
Fahrenheit is the everyday temperature scale in the United States, used for weather, cooking, body temperature, and HVAC settings. Proposed by German physicist Daniel Gabriel Fahrenheit in 1724, it set 0°F as the lowest temperature he could reliably reproduce (a brine-ice mixture) and 96°F as human body temperature. Modern definitions place water's freezing point at exactly 32°F and boiling at 212°F — making the freezing-to-boiling range exactly 180 degrees. The Fahrenheit scale was the international standard for English-speaking countries until the UK and Commonwealth nations switched to Celsius in the 1960s and 70s. Today the United States is the only major industrialized country still using Fahrenheit for weather. A comfortable room is 68–72°F, fever begins at 100.4°F, and Death Valley summer highs reach 120°F. Fahrenheit relates to Celsius by °C = (°F − 32) × 5/9.
- US daily weather and climate reports
- US cooking oven temperatures
- US medical thermometers
US room temperature 68–72 °F. Body temperature 98.6 °F. Fever 100.4 °F. Pizza oven 450 °F.