Celsius to Fahrenheit Calculator
Convert any temperature between Celsius and Fahrenheit instantly. Type in either field for a live two-way result — includes a colour-coded feel indicator, Kelvin conversion and a full common temperature reference table.
| °C | °F | Description |
|---|
How to Convert Celsius to Fahrenheit
To convert Celsius to Fahrenheit, multiply the temperature by 9, divide by 5, then add 32. This formula converts any temperature on the Celsius scale to its exact Fahrenheit equivalent.
Common Celsius to Fahrenheit Conversions
| Celsius (°C) | Fahrenheit (°F) | What It Feels Like |
|---|---|---|
| −40°C | −40°F | Extreme cold — dangerous |
| 0°C | 32°F | Freezing point of water |
| 10°C | 50°F | Very cold — heavy coat needed |
| 15°C | 59°F | Cool — jacket weather |
| 20°C | 68°F | Comfortable room temperature |
| 25°C | 77°F | Warm — t-shirt weather |
| 30°C | 86°F | Hot summer day |
| 37°C | 98.6°F | Normal human body temperature |
| 40°C | 104°F | Extreme heat / high fever |
| 100°C | 212°F | Boiling point of water |
Celsius vs Fahrenheit — Key Differences
Celsius and Fahrenheit are two temperature scales with different zero points and intervals. Celsius is the standard in most countries and is part of the metric system. Fahrenheit is primarily used in the United States.
- Celsius — water freezes at 0°C and boils at 100°C. Used in most countries, science, and medicine worldwide
- Fahrenheit — water freezes at 32°F and boils at 212°F. Used primarily in the United States for everyday weather and cooking
- The two scales meet at −40° — the only temperature that is the same in both Celsius and Fahrenheit
- A change of 1°C equals a change of 1.8°F
When You Need to Convert Celsius to Fahrenheit
- Travel to the US — US weather forecasts, thermostats and ovens all use Fahrenheit
- Cooking American recipes — US recipes typically list oven temperatures in Fahrenheit
- Medical contexts — US medical records and some older thermometers use Fahrenheit
- Understanding international weather — comparing forecasts from different countries
- Science and engineering — converting between units used in international publications
FAQs
How do you convert Celsius to Fahrenheit?
Multiply the Celsius temperature by 9, divide by 5, then add 32. For example, 25°C × 9 ÷ 5 + 32 = 77°F.
What is 37°C in Fahrenheit?
37°C is 98.6°F — normal human body temperature.
What is 100°C in Fahrenheit?
100°C is 212°F — the boiling point of water at sea level.
What is 0°C in Fahrenheit?
0°C is 32°F — the freezing point of water.
At what temperature are Celsius and Fahrenheit the same?
Celsius and Fahrenheit are equal at −40°. This is the only temperature where both scales give the same reading.
Why does the US use Fahrenheit?
The US adopted the Fahrenheit scale before the metric system became the international standard. Most other countries switched to Celsius as part of metrication, but the US retained Fahrenheit for everyday use.
Is this calculator free?
Yes — completely free, no sign-up required.