yes, yes, mine was wrong, I forgot about feet and inches...

"pinmaster" wrote:

Try this:

assumings

A1 = width in feet
B1 = lenght in feet
C1 = spacing in inches

=ROUNDDOWN(A1*12/C1,0)*B1+ROUNDDOWN(B1*12/C1,0)*A1

if I input 100 X 50 I get 7450 feet.

HTH
JG

" wrote:

I'm trying to develop a formula that will calculate the linear feet of
reinforcing bar I will need when I input the dimensions of a
rectangular concrete slab.

Let's say that I have a slab that is 100' x 50' and I need to have
rebar at 16" on center both ways.

I need a formula to calculate that.

Thanks so much.
GMC