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Just go to https://blocktrades.us/ and find out

Currently

100 STEEM will get you 30.124 SBD


Now, what you are probably thinking of is the internal conversion (done by the steem block chain). Where it does give you $1 worth of STEEM, no matter what the SBD was worth.

When this started, STEEM was always less than $1, so it was easy to keep the SBD peg to $1. But, lately it has been all over the place.

This conversion feature has been turned off in steemit.com
If you want to trade SBD for STEEM, use the internal currency market.