Which formula converts Fahrenheit to Kelvin?

• A. K = 5/9(F - 32) + 273
• B. K = 9/5(F - 32) + 273
• C. K = 5/9(F + 32) + 273
• D. F = 5/9(K - 273) + 32

Answer: (A)

When converting Fahrenheit to Kelvin, you go through Celsius first and then add the Kelvin offset. Start with converting Fahrenheit to Celsius: C = (F − 32) × 5/9. Then shift Celsius to Kelvin by adding about 273.15 (often approximated as 273 in basic problems). So you get K = (F − 32) × 5/9 + 273. This form matches the correct approach and uses the standard two-step process: remove the Fahrenheit offset, scale to Celsius, then add the Kelvin offset.

The other expressions don’t fit because they mix up the scaling factor, place the 32 offset in the wrong spot, or express Fahrenheit in terms of Kelvin rather than Kelvin in terms of Fahrenheit, which isn’t the direct conversion asked for.