Double the kilos, add 20%. Bog standard middle school math.
I think most of the "confusion" over metric vs imperial comes from people that never learned imperial because they will literally never use it in their lives, not from people that don't use metric because it isn't widely used but still they learned it years ago because basically every major industry uses it and yes you WILL need it at some point.
Metric is in far wider use in the US than is believed outside of the US.