From To 1/K 1/C 1/F 1/R
1/K 1 1 0.555556 0.555556
1/C 1 1 0.555556 0.555556
1/F 1.8 1.8 1 1
1/R 1.8 1.8 1 1

Each cell shows the factor to convert 1 unit of the row header into the column header.

Highlighted diagonal cells represent identity conversions (1:1).