The Formula

The formula to convert Kelvin to Fahrenheit is:

°F = (K - 273.15) × 9/5 + 32

Calculation

1. Subtract 273.15 from Kelvin: 45 K - 273.15 = -228.15

2. Multiply by 9/5: -228.15 × 9/5 = -410.67

3. Add 32: -410.67 + 32 = -378.67

Answer:

45 Kelvin is equal to -378.67 degrees Fahrenheit.