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My go to spoke length calculator is my own of course. Always measure the ERD if you can. Some rims actually state the ERD on the side but more often than not when I've measured it's been a few mm off as @danstuff has mentioned. The ERD and number of holes has the largest effect on the output. Try changing the values of the hub dimensions and you'll see that it doesn't effect the output that much but even a 2mm change in the ERD and you'll see a noticeable difference.
arup
Which is people’s go to online spoke length calculator?
And is it a bad idea to use the built in presets for hubs and rims? If so, is there a reliable database of things like ERD, Flange distance etc? Thanks