If you don't know about this site, you should.
http://www.steemdollar.com/dollar_per_vote.php?nam is a great site to look at when you want to know your voting power. It tells you how much steem a user gets when you upvote their content 1 time. Realize that for every upvote you give, your 'voting power (percentage)' goes down slightly.
I have finally made it to being able to give people $.01 for each upvote I give. I consider this to be a pretty big deal, as I remember how many times my upvote didn't change the post's value from $.00.
This is a great tool for you to have a better idea about your voting power,
Enjoy Steemians!