Same numbers, but I do 1/6s rather than 1/4s, one sixth of the wind speed per ten degrees.
Gusts? - if there's significant gusts other than straight down the runway I'm probably not going to take off, so don't have to be able to do sums about them in my head. Point being of course that the gusts don't come from the same direction as the steady wind. Which I would expect any tool that did these sums for me to get right, wouldn't I.