Given fractional banking and the multiplier effect, for every dollar in circulation, how many dollars in spendable money exist?
The initial statements about fractional reserve banking are not a question. The simplified example you give does not reflect the complexity of bank lending. The article "Money Creation in the Modern Economy," by Michael McLeay, Amar Radia and Ryland Thomas of the Bank of England link to paper is one place to start to get a more realistic discussion of money creation.


  In practice, in the world and the United States, how many spendable
  dollars are created for each actual dollar in circulation, M0 to M1?


For the United States, these data are available at FRED, a service run by the St. Louis Fed. link to FRED

The relationship changes over time; the policy of quantitative easing greatly affected money supply numbers, and the relationship between them.

If you are interested in multiple countries, you will probably need to track down data from central banks or statistical agencies, or you may be able to find an aggregate source. I am unaware of any free data suppliers that cover money supply data.