"Jbya" > wrote in message
> 115 oz / 4 = 28.75 oz (net wt)
>
> How do I convert this into cup (volume) measure? In other words, how many
> cups does it take to equal 28.75 net wt oz?

Depends.

A cup of ketchup will have a different weight than a cup of oregano or a cup
of salt or a cup of water. Density varies.

Just buy a bottle or two of ketchup in a size that gives the net weight
close to what you need.
Ed

http://pages.cthome.net/edhome