Height of a fascia.

Yeah, but the hardest part is to match siding

It's hard to recommend something about the fascia; you need to provide more information. 
Jessica, siding is easy to pick up. Personally, I just used siding repair service https://www.maxima-aluminum.com. However, if you are doing it all by yourself, siding installation depends on the site and the type of construction. I recommend paying attention to the popularity of a blockhouse that imitates natural vinyl materials or trimmed with profiled sheets. The technology of cladding the walls of a wooden house with siding involves mandatory insulation, as well as a layer of hydro and vapor barrier.

I see it's been a while since you’ve posted, but I just want to ask—did anyone end up finding a simple way to measure the fascia height without needing fancy tools? I’m trying to work on a small project and could use a tip or two. Curious if the old-school methods worked well for anyone or if someone tried something new lately.

I had the same confusion a while ago and found that using a td {border: 1px solid #cccccc;}br {mso-data-placement:same-cell;}real size ruler helped big time. It shows actual measurements on your phone screen so you don’t have to guess if something fits or not. I just placed it next to the item and could see the height in inches or cm super clearly. Makes stuff like this way easier to picture.