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I use the Edd spoke calculator for normal stuff and the DT Swiss one for more offbeat stuff like straight pull hubs. Hub manufacturers are usually pretty accurate with their dimensions, rim manufacturers less so. I always measure just in case. I've yet to find a major discrepancy with hub dimensions (where they've been available) but rim ERDs have been a few mm off sometimes.
The Edd calculator has a database of dimensions, but it's very hit and miss and I don't trust it.
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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.
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Brommers
arup
@TTM
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