I have a Benchmade Stryker with a 3.5" blade length. The handle 4.68" long so it is a little longer. I thought the blade was a little closer to the handle length than that but it is about the ratio I prefer. I should probably say that I don't have a lot of knives, just a couple (and have a couple more I want) so haven't given this alot of thought. It's mostly just what "seems right" in my hand. I probably would not go to a much larger blade.