Temperature conversion formulas
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
K = °C + 273.15
Quick reference
| Celsius | Fahrenheit | What it is |
|---|---|---|
| −40 °C | −40 °F | Where both scales meet |
| 0 °C | 32 °F | Water freezes |
| 25 °C | 77 °F | Room temperature |
| 37 °C | 98.6 °F | Normal body temperature |
| 38 °C | 100.4 °F | Fever threshold (commonly used) |
| 45 °C | 113 °F | Severe heatwave in North India |
| 100 °C | 212 °F | Water boils (sea level) |
| 180 °C | 356 °F | Moderate oven for baking |
Quick mental conversion
To estimate °F from °C, double it and add 30: 25 °C ≈ 80 °F (exact: 77 °F). To go the other way, subtract 30 and halve.
Frequently asked questions
What is 98.6 °F in Celsius?
Exactly 37 °C, the traditional normal human body temperature.
Why is there no degree sign with Kelvin?
Kelvin is an absolute scale starting at absolute zero, so values are written simply as K, for example 300 K.
Conversions use standard factors and are for general information. Exchange rates are indicative and may differ from rates offered by banks.