The WP importer should do the job for you. You may need to install it first.
Backup. Backup. Backup. Then, from your current single site: Tools > Export > All Content > Download
Then from the new location on your multi-site, Tools > Import > locate the export file and adjust options to your needs.
Note – you will need to still take care of settings like widgets, setting up your menu locations and possibly a few other tasks depending on how your theme was written.
There are many horror stories out there about the WP import/export tool. Some are true but most problems occur (in my experience) when doing partial content. In this case you are moving everything but your mileage may vary.
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