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 68 °F you have: ((68 + 459.67) × 5) ÷ 9 = (527.67 × 5) ÷ 9 = 2638.35 ÷ 9 = 293.15 K