100 degrees Fahrenheit equals approximately 37.7778 degrees Celsius.
To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature, then multiply the result by 5/9. So, for 100°F: (100 – 32) × 5/9 = 37.7778°C.
Conversion Tool
Result in celsius:
Conversion Formula
The formula to convert Fahrenheit (F) to Celsius (C) is:
C = (F – 32) × 5/9
This works because the Fahrenheit and Celsius scales have different zero points and increments. Fahrenheit’s zero is at 32 degrees below water’s freezing point on Celsius. Subtracting 32 shifts the scale to align with Celsius, then multiplying by 5/9 adjusts the scale size since 180 Fahrenheit degrees equal 100 Celsius degrees.
Example with 100°F:
- Start with 100°F
- Subtract 32: 100 – 32 = 68
- Multiply by 5/9: 68 × 5/9 ≈ 37.7778
- Result: 37.7778°C
Conversion Example
- Convert 85°F to Celsius:
- Subtract 32: 85 – 32 = 53
- Multiply by 5/9: 53 × 5/9 ≈ 29.4444
- Result: about 29.44°C
- Convert 212°F to Celsius:
- Subtract 32: 212 – 32 = 180
- Multiply by 5/9: 180 × 5/9 = 100
- Result: exactly 100°C
- Convert 50°F to Celsius:
- Subtract 32: 50 – 32 = 18
- Multiply by 5/9: 18 × 5/9 = 10
- Result: 10°C
- Convert 0°F to Celsius:
- Subtract 32: 0 – 32 = -32
- Multiply by 5/9: -32 × 5/9 ≈ -17.7778
- Result: about -17.78°C
Conversion Chart
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| 75.0 | 23.8889 |
| 80.0 | 26.6667 |
| 85.0 | 29.4444 |
| 90.0 | 32.2222 |
| 95.0 | 35.0000 |
| 100.0 | 37.7778 |
| 105.0 | 40.5556 |
| 110.0 | 43.3333 |
| 115.0 | 46.1111 |
| 120.0 | 48.8889 |
| 125.0 | 51.6667 |
This chart helps you quickly find Celsius equivalents for Fahrenheit values from 75 to 125. Locate the Fahrenheit value in the left column, then read across to find the corresponding Celsius temperature. Useful for quick reference without calculation.
Related Conversion Questions
- What is 100°F in Celsius rounded to two decimal places?
- How do you convert 100 degrees Fahrenheit into Celsius manually?
- Is 100°F closer to boiling or freezing point in Celsius?
- What Celsius temperature equals 100 Fahrenheit in weather reports?
- Can I use the formula (F – 32) × 5/9 to convert 100°F?
- Why does 100°F convert to about 38°C and not 40°C?
- How accurate is converting 100°F to Celsius with the standard formula?
Conversion Definitions
Fahrenheit: Fahrenheit is a temperature scale where water freezes at 32 degrees and boils at 212 degrees. It is mostly used in the United States and a few other countries. Temperatures are measured in degrees Fahrenheit (°F), with each degree representing a fraction of the temperature difference between freezing and boiling water.
Celsius: Celsius is a temperature scale used worldwide, especially in scientific contexts. Water freezes at 0 degrees and boils at 100 degrees Celsius. The scale measures temperature in degrees Celsius (°C), dividing the range between freezing and boiling points of water into 100 equal parts, making conversions between Celsius and Fahrenheit possible.
Conversion FAQs
Why do we subtract 32 when converting from Fahrenheit to Celsius?
The Fahrenheit scale sets its zero point at a different temperature than Celsius. Water freezes at 32°F, so to align with Celsius’ zero point, you subtract 32 from the Fahrenheit value before adjusting for scale size. This subtraction shifts the Fahrenheit reading to a zero-based scale matching Celsius.
Is the formula (F – 32) × 5/9 exact for all temperatures?
Yes, the conversion formula is mathematically exact for all temperatures within both scales. Because both Fahrenheit and Celsius scales are linear, the formula applies uniformly from very cold to very hot temperatures, without any exceptions or adjustments needed.
Can I convert Celsius back to Fahrenheit using a simple formula?
Yes, to convert Celsius (C) to Fahrenheit (F), you use the formula F = (C × 9/5) + 32. This reverses the subtraction and multiplication steps, scaling the Celsius value up, then shifting it to the Fahrenheit zero point.
Why does 100°F seem warm but not extremely hot in Celsius?
Because 100°F converts to about 37.78°C, which is close to human body temperature, it feels warm but not unbearable. Celsius values above 40°C start to feel very hot, so 100°F sits in a moderately warm range rather than extreme heat.
Do all countries use Celsius for temperature measurement?
Most countries use Celsius for daily temperature measurements and scientific work. However, the United States and a few others still primarily use Fahrenheit, especially in weather forecasts and cooking. Conversion between the two is common depending on context.