Spoke length for Koxx hub

Hey, I have a Koxx reinforced hub that needs to go inside a KH 19" rim. Can anyone tell me the exact length the spokes need to be to fit?

call UDC and ask
they will know

use the spoke length calc on udc.uk

Where is that?

Right here except the Koxx hubs aren’t preset in there, so you’ll need to measure up your hub yourself and enter the details.

a caliper would be nice for this.