From To H mH uH nH
H 1 1000 1e+06 1e+09
mH 0.001 1 1000 1e+06
uH 1e-06 0.001 1 1000
nH 0 1e-06 0.001 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).