when filling a baitcasting spool, how much line do you put on (after backing)? with exception of crankbaits where i add 3/4 of a spool of fresh line after backing.

But for jigs, worms spinnerbaits and so on, how many reels could you fill with 150yrd of braid?

I could fill two reels with 150 yards of braid.

This has been gone through before, but I do as Ohio does. Split a spool between two reels.

50 yards of backing, 100 yards of whatever line you

have chosen to fish.

8-)

I've been buying 300yard spools of Sufix and I put 100 yards on each reel (i.e. 3reels per spool).

I fill them completely and don't really worry about what's left over. With a fluoro leader, I can go for a few seasons on a full spool of braid, as long as I don't have a mega-backlash. 

How do you know how much line you have put on?  Do you guess or do you use a line counter?

Guess or walk off the backing in your yard.

http://www.basspro.com/Berkley-Line-Counter/product/10220051/-1747378

I mark the spool a little more than 1/3 up with a thin sharpie. This represents ~50yards of line (all my bass reels have roughly 150yd/12lb capacity). Note...you have to go a little past the 1/3 mark, because the relationship between radial distance from the spool and amount of line released is NOT linear (C= pi * D. D changes as more line is spooled).

So basically, fill the reel up to the mark with backer (old mono) and fill the rest with braid. It will be 100yards give or take...

http://www.basspro.com/Berkley-Line-Counter/product/10220051/-1747378

i just ordered one on ebay.