I have the same issue.. worked on a farm for 4 years (actually working, but i was at the farm a steady 5-15 hrs a week for several years before I actually started working!) So I have noooo clue how to calculate this!
*edit, i somehow skipped over the post before mine! What I get for multitasking. That's about what I've been trying to do, but I come up with a pretty big number.. exceeding 4,000.. will they think I'm lying? lol
Also, I am as well a 2016 hopeful.. will be applying several places in the fall.. I'm thinking Tufts, Iowa, UF (I'm in state for UF.. but may not have all the prereqs yet) probably Purdue, and Tuskeegee... I'm not going to get my hopes up just yet though, as I'm behind in experience!
I have a 3.65 right now, taking the GRE in April/May and again in August, I have a ton of animal experience, but not a whole lot of vet experience yet.. but I am working with a vet who will give me as many hours as possible, and also possibly starting volunteering at a canine rehab center. 🙂
Also, what sort of staff recommendation letters are you all getting? I'm so worried about this!! Does it have to be a science teacher? 😕
Another question.. if I will finish my prereqs in spring following my application, can I still apply to the school that needs those classes?? This is my main concern!