How many K is 5 °C?
5 °C = 278.15 K
It is 278.15 K, so saying 278 K is fine — rounding is within 0.5%.
And how many °C is 5 K?
5 K = -268.15 °C
Formula: K = °C × 1 + 273.15
°C to K around this value
0.5 °C273.65K
1 °C274.15K
1.5 °C274.65K
2 °C275.15K
2.5 °C275.65K
3 °C276.15K
3.5 °C276.65K
4 °C277.15K
4.5 °C277.65K
5 °C278.15K
5.5 °C278.65K
6 °C279.15K
6.5 °C279.65K
7 °C280.15K
7.5 °C280.65K
8 °C281.15K
8.5 °C281.65K
9 °C282.15K
9.5 °C282.65K
10 °C283.15K