Every takeoff line needs a unit. Common ones are EA, LF, SF, SY, CY, ton and LS for lump sum.
Trouble starts when units do not match. You measure carpet in square feet and the supplier quotes in square yards.
Write the unit on every line. Convert once, in one place, and show the math. Check each supplier quote for its unit before you enter the price.
On a unit price bid, use the unit the bid form gives. Read how the documents say that unit is measured.