smooth bed floor

how much steel would I be looking at to do a smooth bed in a reg cab mazda that's been bodydropped 3 inches?

I can get it in 4x8, 4x10, 5x8, and 5x10. I am thinking on getting a sheet f 4x10 and go from there, and if i need more get more. who has done it and how much did yu end up using. it's 2.50 a sq. foot.

i got a 5x10 of 16guage cold rolled steel and it was plenty enough for my bed floor.

bust out the measuring tape and figure it out... shouldn't take ya much more than 5 mins to figure it out on your own.