−4 °C at a glance
- Fahrenheit
- 24.8 °F
- Kelvin
- 269.15 K
- Rankine
- 484.47 °R
- Rounded
- 25 °F
- Quick estimate
- 22 °F
- As a change (Δ)
- Δ−4 °C = Δ−7.2 °F
How to convert −4 °C to Fahrenheit
−4 × 1.8 = −7.2
−7.2 + 32 = 24.8 °F
Multiply by 9/5 (1.8) because each Celsius degree spans 1.8 Fahrenheit degrees, then add 32 because water freezes at 32 °F rather than 0. The answer always has at most one decimal place, because multiplying a whole number by 1.8 can only leave tenths.
Estimate it in your head
Double it and add 30: −4 × 2 + 30 = 22 °F, which is 2.8 degrees low.
Careful with temperature changes: a rise of 4 °C is a rise of 7.2 °F — multiply by 1.8 but do not add 32.
What −4 °C means outdoors
At 24.8 °F, standing water freezes and road surfaces can glaze over. Temperatures just below freezing are the trickiest for drivers, because melting and refreezing make black ice. With wind, it feels colder still:
| Wind | Feels like | In °F | Note |
|---|---|---|---|
| 10 km/h | −8 °C | 17 °F | Dress in layers |
| 20 km/h | −10 °C | 13 °F | Dress in layers |
| 40 km/h | −13 °C | 9 °F | Dress in layers |
Temperatures near −4 °C
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| −9 °C | 15.8 °F | 264.15 K |
| −8 °C | 17.6 °F | 265.15 K |
| −7 °C | 19.4 °F | 266.15 K |
| −6 °C | 21.2 °F | 267.15 K |
| −5 °C | 23 °F | 268.15 K |
| −4 °C | 24.8 °F | 269.15 K |
| −3 °C | 26.6 °F | 270.15 K |
| −2 °C | 28.4 °F | 271.15 K |
| −1 °C | 30.2 °F | 272.15 K |
| 0 °C | 32 °F | 273.15 K |
| 1 °C | 33.8 °F | 274.15 K |
Going the other way: 25 °F in Celsius is −3.89 °C.
Frequently asked questions
What is −4 °C in Fahrenheit?
−4 °C is 24.8 °F: multiply by 1.8 (−7.2) and add 32.
Is −4 °C hot or cold?
−4 °C is below freezing: ice, frost and possibly snow.
How do you convert −4 °C to Fahrenheit quickly?
Double it and add 30: 22 °F. The exact value is 24.8 °F.
What is −4 °C in Kelvin?
Add 273.15: −4 °C = 269.15 K.