4 °C at a glance
- Fahrenheit
- 39.2 °F
- Kelvin
- 277.15 K
- Rankine
- 498.87 °R
- Rounded
- 39 °F
- Quick estimate
- 38 °F
- As a change (Δ)
- Δ4 °C = Δ7.2 °F
How to convert 4 °C to Fahrenheit
°F = °C × 9/5 + 32
4 × 1.8 = 7.2
7.2 + 32 = 39.2 °F
4 × 1.8 = 7.2
7.2 + 32 = 39.2 °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 = 38 °F, which is 1.2 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.
4 °C in the fridge and outdoors
- Refrigerators. Food-safety agencies recommend keeping a fridge at 4 °C (40 °F) or colder; 4 °C (39.2 °F) is right at that limit.
- Densest water. Fresh water is densest at about 4 °C, so in winter the bottom of a deep lake stays near 4 °C while ice forms on top — which is why fish survive under the ice.
- Wind chill. Outdoors, wind makes 4 °C feel colder:
| Wind | Feels like | In °F | Note |
|---|---|---|---|
| 10 km/h | 1 °C | 35 °F | Dress in layers |
| 20 km/h | 0 °C | 32 °F | Dress in layers |
| 40 km/h | −2 °C | 28 °F | Dress in layers |
Temperatures near 4 °C
| Celsius | Fahrenheit | Kelvin |
|---|---|---|
| −1 °C | 30.2 °F | 272.15 K |
| 0 °C | 32 °F | 273.15 K |
| 1 °C | 33.8 °F | 274.15 K |
| 2 °C | 35.6 °F | 275.15 K |
| 3 °C | 37.4 °F | 276.15 K |
| 4 °C | 39.2 °F | 277.15 K |
| 5 °C | 41 °F | 278.15 K |
| 6 °C | 42.8 °F | 279.15 K |
| 7 °C | 44.6 °F | 280.15 K |
| 8 °C | 46.4 °F | 281.15 K |
| 9 °C | 48.2 °F | 282.15 K |
Going the other way: 39 °F in Celsius is 3.89 °C.
Frequently asked questions
What is 4 °C in Fahrenheit?
4 °C is 39.2 °F: multiply by 1.8 (7.2) and add 32.
Is 4 °C hot or cold?
4 °C is cold — refrigerator temperature.
How do you convert 4 °C to Fahrenheit quickly?
Double it and add 30: 38 °F. The exact value is 39.2 °F.
What is 4 °C in Kelvin?
Add 273.15: 4 °C = 277.15 K.