For any Leanpub book, on the "Sales" page under "Store" you can also see Paid, Free, and Total purchases.

To find the "Sales" page for your book, go here:

...making sure to replace YOUR_BOOK with your book's unique web address.

You can also get information on all purchases of any book on the "Individual Purchases" page under the "Store" menu, e.g.:

There, you can download a CSV file for all your purchases, and you could sort all the free purchases in Excel.

You can find links to both of these pages on your book's Overview page:

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