42°C in Fahrenheit
The exact conversion, the formula, and a mental shortcut that is close enough for weather.
The formula
Multiply by 9/5 and add 32.
(42 × 9 ÷ 5) + 32 = 75.6 + 32 = 107.6 °F
For weather, a shortcut that needs no calculator is to double the Celsius and add 30: 42 × 2 + 30 = 114, against an exact 107.6. It drifts by about 2 °F per 10 °C, which is fine for deciding what to wear and useless for cooking.
What this temperature feels like
Dangerously hot. Sustained exposure at this level is a genuine health risk.
Nearby temperatures
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| 37 °C | 98.6 °F | 310.15 K |
| 38 °C | 100.4 °F | 311.15 K |
| 39 °C | 102.2 °F | 312.15 K |
| 40 °C | 104 °F | 313.15 K |
| 41 °C | 105.8 °F | 314.15 K |
| 43 °C | 109.4 °F | 316.15 K |
| 44 °C | 111.2 °F | 317.15 K |
| 45 °C | 113 °F | 318.15 K |
Frequently asked questions
What is 42°C in Fahrenheit?
107.6°F. Multiply the Celsius figure by 9/5 and add 32.
What is the formula?
°F = (°C × 9/5) + 32. To go the other way, °C = (°F − 32) × 5/9.
At what temperature are the two scales equal?
−40. That is the single point where Celsius and Fahrenheit give the same number, which makes it a handy check on any conversion you do by hand.
Nearby values
Last reviewed September 5, 2026.