I feel like I am probably missing something obvious here.
I have a couple of ED websites saved on my iPhone that I often consult - one (INARA) even when I am playing.

I do all my Internet forum reading on this phone and often see CG's or other events obviously listed by system name but don't know how much I should plan as I have no idea the distance (LY's) involved.
There must be a website that I can throw in the name of two systems and find out the distance between them but all the websites I have seem to be lacking that feature or I am completely missing it.

Anyone have any idea?

ED Shipyard has this. Just save a link to your ship build, and then enter the to/from systems on the little box on the page. It will give you an estimated route and fueling needs.

Never tested it's accuracy, but the times I've used it, it was close enough for my purposes.

Excellent! Thanks adlabs6!
Works like a dream.

Once I put in my ship config (twice as I couldn't figure out how to save it the first time till I reread your post!) it works just fine and even gives the amount of fuel remaining after each jump. Have to get my other ship configs saved up also.

I'm curious why you'd need this outside of the game?

Very simple.
My actual "on the computer" time is fairly limited, especially during the week, whereas I have this fancy phone I have to carry 24/7 for work.
It's not too tough to find 5-10 minutes several times a day to jump on here ergo if I can do my planning from the phone I save actual computer time for gaming...err...simulating.

And, for anyone who is going to use ED Shipyard for distance checks it also gives you the route (by system name) and the % of fuel you should have remaining. If it also listed the system stars as scoopable or not I would be in hog heaven.