Hello, thank you for your inquiry.
The most accurate size would be to measure your foot using a brannock device, but I did take your measurements and compared it on one the best I could. I think you should be able to wear a 12.5 US or 13 US. There isn't much of a size difference between the two sizes but Scarpa is one of those brands that offers a 12.5 size. Most customers have reported that the Kailash runs true to size. You do want a little room in the toe area so they don't bruise but you also want a really good fit in the heal area.
We currently have a 12.5 US in stock, the size 13 has been ordered and should arrive at our warehouse in the next 1-2 weeks. Which ever size you decided our Fit Guarantee allows you to exchange products without having to pay for shipping. If it is possible to test the fit inside that would be ideal. Please feel free to contact us with any further questions or assistance. Have a great day!