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London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
dglshrn
I've always had success with the DT one https://spokes-calculator.dtswiss.com/en/
The "OFFSET" in the Hope chart is labelled "Flange distance" in the DT calculator.
Pay attention to the LB definition of ERD, you'll probably decide to add a bit in calculation to get the spoke to terminate exactly at the base of the nipple screwdriver slot.
Also, don't take anybody's word for anything, measure the rims and hubs you have in your hand before ordering spokes. Ideally, measure ERD using the nipples you'll be building with.