I am an old Wireline Logging engineer and over the years I found myself repeating the same calculations day after day. Hating inefficiency, I started building Excel based "Calculators" to aid in my job. At present I will be adding additional Wireline Logging applications as I convert them to public use, so check back from time to time. Eventually I hope to add a few additional workbooks related to non-Wireline applications, such as firearm ballistics.I would also entertain developing XL based applications based on user specific specifications.