Take the square root of the load factor and multiply it by the stalling speed at 0° of bank.

Example:
Stalling speed = 47KT (Vs)
Stalling speed at 45° bank = √ 1.41 * 47
Stalling speed at 45° bank = 55 KT

Angle of Bank Load Factor (G’s)
0° 10
15° 1.04
30° 1.15
45° 1.41
60° 2
75° 3.9