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How to use the Fahrenheit to Celsius
- 1Type the value you want to convert.
- 2The result updates instantly as you type.
- 3Use the swap button to convert in the other direction, or check the chart below.
How to convert 100 °F to Celsius
Subtract 32, then multiply by 5/9: (100 − 32) × 5/9 = 37.78 °C. Quick estimate: subtract 30 and halve it, which gives 35 °C (close for everyday temperatures).
Is 100 °F a fever?
No. 100 °F (37.8 °C) is within the normal range for body temperature, which is about 97–99 °F (36.1–37.2 °C) and varies through the day. A fever starts at 100.4 °F (38 °C).
Temperatures measured in the mouth, ear, armpit and forehead differ slightly; armpit readings are usually the lowest.
Nearby values
| Fahrenheit | Celsius |
|---|---|
| 97.5 °F | 36.4 °C |
| 98 °F | 36.7 °C |
| 98.6 °F | 37 °C |
| 99 °F | 37.2 °C |
| 99.5 °F | 37.5 °C |
| 100 °F | 37.8 °C |
| 100.4 °F | 38 °C |
| 101 °F | 38.3 °C |
| 102 °F | 38.9 °C |
| 103 °F | 39.4 °C |
| 104 °F | 40 °C |
Popular conversions
Frequently asked questions
What is 100 °F in Celsius?
100 °F is 37.78 °C: (100 − 32) × 5/9.
What is 100 °F in Kelvin?
100 °F is 310.93 K (add 273.15 to the Celsius value).