Formula:

Kelvin = (Fahrenheit + 459.67) × 5/9

Calculation:

1. Add 459.67 to the Fahrenheit temperature: 300 °F + 459.67 = 759.67

2. Multiply the result by 5/9: 759.67 × 5/9 = 421.82 K

Therefore, 300 degrees Fahrenheit is equal to 421.82 Kelvin.