Some rails are built to be compatible for queen and king mattresses in which case you can stop at this step.
Convert king bed frame to queen.
Not every queen bed should be converted.
However there are some queen beds that work quite well like wood beds that are relatively wide.
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A king size bed in the united states measures 76 inches by 80 inches and a queen size bed measures 60 inches by 80 inches.
Step 2 slide the rails together until the frame width is 60 inches.
Smallish wood frames and small iron or metal beds should go to a guest bedroom.
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This means that the only thing you need to change to convert your queen bed into a king is the width of the headboard and foot board.
Check that the smallest possible setting is wider than 60 inches the width of a queen mattress.