I'm trying to build my 32H formula flip flop hub/Sun m13 rim with a 3-cross pattern and I'm confused about what spoke length to order. I'm using the spocalc spreedsheet and it's telling me to use 332.3 spokes. I can't find spokes that large to order. When I enter the same hub and rim combo as the front wheel it comes up as 299.3, which is a seemingly much more common length. Any thought?

Try the calc on the DT-Swiss website. I usually compare readings from both sites.

I'm trying to build my 32H formula flip flop hub/Sun m13 rim with a 3-cross pattern and I'm confused about what spoke length to order. I'm using the spocalc spreedsheet and it's telling me to use 332.3 spokes. I can't find spokes that large to order. When I enter the same hub and rim combo as the front wheel it comes up as 299.3, which is a seemingly much more common length. Any thought?
Recheck your data. The same numbers should give you the same results; front or rear. - TF