Direct comparison
What is the difference between Celsius and Fahrenheit?
Celsius and Fahrenheit are temperature scales with different zero points and degree intervals. Water freezes at 0°C or 32°F and boils at approximately 100°C or 212°F under standard atmospheric pressure.
Celsius is widely used internationally and in scientific contexts. Fahrenheit is commonly used for everyday temperatures in the United States.
A Celsius degree represents a larger temperature interval than a Fahrenheit degree. One Celsius degree of change equals 1.8 Fahrenheit degrees of change.
Enter any Celsius value to calculate its Fahrenheit equivalent.
Key characteristics
Celsius and Fahrenheit at a glance
| Feature | Celsius | Fahrenheit |
|---|---|---|
| Symbol | °C | °F |
| Water freezing point | 0°C | 32°F |
| Water boiling point | 100°C | 212°F |
| Intervals between those points | 100 degrees | 180 degrees |
| Temperature-change relationship | 1°C | 1.8°F |
| Common everyday use | Most countries | United States |
Scale landmarks
Common Celsius and Fahrenheit reference points
| Reference | Celsius | Fahrenheit |
|---|---|---|
| Scales are equal | −40°C | −40°F |
| Water freezes | 0°C | 32°F |
| Cool weather | 10°C | 50°F |
| Mild room temperature | 20°C | 68°F |
| Warm weather | 30°C | 86°F |
| Common body reference | 37°C | 98.6°F |
| Water boils at standard pressure | 100°C | 212°F |
Weather descriptions are approximate because comfort also depends on humidity, wind, sunlight, clothing, and activity.
Temperature intervals
Is one Celsius degree larger than one Fahrenheit degree?
Yes. A change of one degree Celsius is larger than a change of one degree Fahrenheit.
Larger temperature interval
Approximately 0.556°C
Interval conversion
This does not mean a reading of 1°C equals 1.8°F. Actual scale readings also require the 32-degree offset.
One degree Celsius equals 33.8°F as a scale reading, but a temperature increase of 1°C equals an increase of 1.8°F.
Changing scales
How to convert between Celsius and Fahrenheit
Example: (20 × 9/5) + 32 = 68°F.
Example: (68 − 32) × 5/9 = 20°C.
The order matters. Add 32 after multiplying when converting Celsius to Fahrenheit. Subtract 32 before multiplying when converting Fahrenheit to Celsius.
Where the scales appear
When Celsius or Fahrenheit is commonly used
| Application | Celsius | Fahrenheit |
|---|---|---|
| Weather | Widely used internationally | Common in the United States |
| Cooking | Metric recipes and ovens | US recipes and ovens |
| Body temperature | Many medical systems | Common US reporting |
| Science | Common practical scale | Less common |
| Thermostats | Metric-market devices | US-market devices |
Some digital devices allow users to switch between scales without manually converting the temperature.
Outdoor conditions
Comparing weather in Celsius and Fahrenheit
Water may freeze
Light-jacket weather for many people
Comfortable for many people
Warm outdoor conditions
Heat precautions may be useful
Potentially hazardous heat
These descriptions are general. Humidity, wind, shade, direct sunlight, exertion, and personal health affect how temperature feels.
Scale intersection
When are Celsius and Fahrenheit equal?
Celsius and Fahrenheit have the same numerical value at negative 40 degrees.
This is the only temperature where both scales display the same number.
The result can be found by setting the Celsius value equal to the Fahrenheit value in the conversion equation and solving for the temperature.
Measurement precision
Is Celsius more accurate than Fahrenheit?
Neither scale is inherently more accurate. Accuracy depends on the thermometer, sensor calibration, measurement conditions, displayed precision, and rounding.
Fahrenheit uses smaller degree intervals, which can provide more whole-number steps across an everyday temperature range. Celsius instruments can display decimal values and achieve the same or greater resolution.
Larger degree step
Decimal Celsius resolution
Calibration affects accuracy
Conversion cannot improve the accuracy of the source reading. A temperature measured only to the nearest degree should not be treated as highly precise after conversion.
Continue reading
Related Celsius-to-Fahrenheit guides
Questions and answers
Frequently asked questions
Which is colder, 0 Celsius or 0 Fahrenheit?
Zero degrees Fahrenheit is colder. It equals approximately negative 17.78 degrees Celsius.
Is one Celsius degree larger than one Fahrenheit degree?
Yes. A change of one degree Celsius equals a change of 1.8 degrees Fahrenheit.
Where are Celsius and Fahrenheit equal?
The scales are equal at negative 40 degrees.
Is Celsius more accurate than Fahrenheit?
Neither scale is inherently more accurate. Accuracy depends on the measuring instrument and measurement conditions.
Convert a temperature
Use the Celsius to Fahrenheit Converter
Enter any positive, negative, whole, or decimal Celsius temperature to calculate Fahrenheit instantly.
Open Celsius to Fahrenheit ConverterLast updated: July 27, 2026