100 degrees Fahrenheit is equal to 37.7778 degrees Celsius.
The conversion from Fahrenheit to Celsius uses a formula that adjusts for the different zero points and scaling of each temperature scale. Fahrenheit measures temperature starting at 32 for the freezing point of water, while Celsius starts at 0. By subtracting 32 and scaling by 5/9, we find the equivalent Celsius value.
Conversion Tool
Result in celsius:
Conversion Formula
The formula to convert Fahrenheit (°F) to Celsius (°C) is:
°C = (°F – 32) × 5/9
This formula works because the Fahrenheit scale sets 32°F as the freezing point of water and 212°F as boiling, while Celsius uses 0°C and 100°C for freezing and boiling points. The difference between boiling and freezing is 180 degrees Fahrenheit and 100 degrees Celsius, so the scaling factor is 5/9.
Step-by-step example for 100°F:
- Subtract 32: 100 – 32 = 68
- Multiply by 5/9: 68 × 5/9 = 68 × 0.5555… ≈ 37.7778
- Result is 37.7778°C
Conversion Example
- 75°F to Celsius
- Subtract 32: 75 – 32 = 43
- Multiply by 5/9: 43 × 5/9 ≈ 23.8889
- So, 75°F = 23.8889°C
- 85°F to Celsius
- Subtract 32: 85 – 32 = 53
- Multiply by 5/9: 53 × 5/9 ≈ 29.4444
- Therefore, 85°F equals 29.4444°C
- 110°F to Celsius
- Subtract 32: 110 – 32 = 78
- Multiply by 5/9: 78 × 5/9 ≈ 43.3333
- Hence, 110°F = 43.3333°C
- 95°F to Celsius
- Subtract 32: 95 – 32 = 63
- Multiply by 5/9: 63 × 5/9 ≈ 35.0000
- So 95°F converts to 35.0000°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 shows the Celsius equivalents of Fahrenheit temperatures from 75 to 125 degrees. You can quickly find the Celsius value by locating the Fahrenheit temperature in the left column and reading the matching Celsius value on the right.
Related Conversion Questions
- What is 100 degrees Fahrenheit in Celsius?
- How to convert 100°F to °C without a calculator?
- Is 100°F above or below body temperature in Celsius?
- What temperature does 100 °F correspond to in Celsius scale?
- How do I convert 100 Fahrenheit degrees into Celsius units?
- What’s the Celsius equivalent if the temperature is 100°F?
- How to quickly estimate 100°F in Celsius in daily life?
Conversion Definitions
Fahrenheit: Fahrenheit is a temperature scale where the freezing point of water is 32 degrees and the boiling point is 212 degrees under standard atmospheric pressure. It is widely used in the United States and some Caribbean countries for weather forecasts and cooking temperatures.
Celsius: Celsius, also called centigrade, is a temperature scale where 0 degrees represents the freezing point of water and 100 degrees represents the boiling point at sea level. It is the standard scale for most countries and scientific measurements worldwide.
Conversion FAQs
Can I convert Fahrenheit to Celsius by just subtracting 30?
Subtracting 30 from a Fahrenheit temperature gives a rough Celsius estimate but is not accurate. The correct formula needs subtracting 32 and multiplying by 5/9. The 30 subtraction ignores the exact offset and scale difference, so it only works for quick mental math, not precise conversions.
Why does the formula subtract 32 before multiplying?
Because the Fahrenheit and Celsius scales start at different zero points. Water freezes at 32°F but 0°C. Subtracting 32 shifts the Fahrenheit value to align the zero points before scaling by 5/9 to adjust for the degree size difference.
Is the conversion formula different for negative temperatures?
No, the same formula applies for any Fahrenheit value, positive or negative. Even below freezing, subtract 32 then multiply by 5/9 to get the Celsius equivalent. The formula works across the entire temperature range without modification.
Can I convert Celsius back to Fahrenheit easily?
Yes, use the formula °F = (°C × 9/5) + 32. This reverses the scaling and offset of the Fahrenheit scale, allowing conversion from Celsius back to Fahrenheit with correct results.
Why does 100°F seem warm but not hot in Celsius?
Because 100°F converts to about 37.78°C, near normal human body temperature, which feels warm but not extremely hot. Celsius uses different scaling and reference points, so temperatures can feel different when expressed in each scale.