To convert degrees Fahrenheit to Kelvins you need to add 459.67 to degrees Fahrenheit multiply the result by 5 and divide it by 9.
With 212 °F you have: ((212 + 459.67) × 5) ÷ 9 = (671.67 × 5) ÷ 9 = 3358.35 ÷ 9 = 373.15 K