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.
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.
Why convert your queen bed to a king.
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However there are some queen beds that work quite well like wood beds that are relatively wide.
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.
Smallish wood frames and small iron or metal beds should go to a guest bedroom.
Step 2 slide the rails together until the frame width is 60 inches.
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